src/content/common/gpu/client/gl_helper_unittest.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include <stdio.h>
   6 #include <cmath>
   7 #include <string>
   8 #include <vector>
   9
  10 #include <GLES2/gl2.h>
  11 #include <GLES2/gl2ext.h>
  12 #include <GLES2/gl2extchromium.h>
  13
  14 #include "base/at_exit.h"
  15 #include "base/bind.h"
  16 #include "base/command_line.h"
  17 #include "base/debug/trace_event.h"
  18 #include "base/files/file_util.h"
  19 #include "base/json/json_reader.h"
  20 #include "base/message_loop/message_loop.h"
  21 #include "base/run_loop.h"
  22 #include "base/strings/stringprintf.h"
  23 #include "base/synchronization/waitable_event.h"
  24 #include "base/time/time.h"
  25 #include "content/common/gpu/client/gl_helper.h"
  26 #include "content/common/gpu/client/gl_helper_readback_support.h"
  27 #include "content/common/gpu/client/gl_helper_scaling.h"
  28 #include "content/public/test/unittest_test_suite.h"
  29 #include "content/test/content_test_suite.h"
  30 #include "media/base/video_frame.h"
  31 #include "testing/gtest/include/gtest/gtest.h"
  32 #include "third_party/skia/include/core/SkBitmap.h"
  33 #include "third_party/skia/include/core/SkTypes.h"
  34 #include "ui/gl/gl_implementation.h"
  35 #include "webkit/common/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h"
  36
  37 #if defined(OS_MACOSX)
  38 #include "base/mac/scoped_nsautorelease_pool.h"
  39 #endif
  40
  41 namespace content {
  42
  43 using blink::WebGLId;
  44 using blink::WebGraphicsContext3D;
  45 using webkit::gpu::WebGraphicsContext3DInProcessCommandBufferImpl;
  46
  47 content::GLHelper::ScalerQuality kQualities[] = {
  48     content::GLHelper::SCALER_QUALITY_BEST,
  49     content::GLHelper::SCALER_QUALITY_GOOD,
  50     content::GLHelper::SCALER_QUALITY_FAST, };
  51
  52 const char* kQualityNames[] = {"best", "good", "fast", };
  53
  54 class GLHelperTest : public testing::Test {
  55  protected:
  56   void SetUp() override {
  57     WebGraphicsContext3D::Attributes attributes;
  58     bool lose_context_when_out_of_memory = false;
  59     context_ =
  60         WebGraphicsContext3DInProcessCommandBufferImpl::CreateOffscreenContext(
  61             attributes, lose_context_when_out_of_memory);
  62     context_->InitializeOnCurrentThread();
  63     context_support_ = context_->GetContextSupport();
  64     helper_.reset(
  65         new content::GLHelper(context_->GetGLInterface(), context_support_));
  66     helper_scaling_.reset(new content::GLHelperScaling(
  67         context_->GetGLInterface(), helper_.get()));
  68   }
  69
  70   void TearDown() override {
  71     helper_scaling_.reset(NULL);
  72     helper_.reset(NULL);
  73     context_.reset(NULL);
  74   }
  75
  76   void StartTracing(const std::string& filter) {
  77     base::debug::TraceLog::GetInstance()->SetEnabled(
  78         base::debug::CategoryFilter(filter),
  79         base::debug::TraceLog::RECORDING_MODE,
  80         base::debug::TraceOptions(
  81             base::debug::RECORD_UNTIL_FULL));
  82   }
  83
  84   static void TraceDataCB(
  85       const base::Callback<void()>& callback,
  86       std::string* output,
  87       const scoped_refptr<base::RefCountedString>& json_events_str,
  88       bool has_more_events) {
  89     if (output->size() > 1) {
  90       output->append(",");
  91     }
  92     output->append(json_events_str->data());
  93     if (!has_more_events) {
  94       callback.Run();
  95     }
  96   }
  97
  98   // End tracing, return tracing data in a simple map
  99   // of event name->counts.
 100   void EndTracing(std::map<std::string, int>* event_counts) {
 101     std::string json_data = "[";
 102     base::debug::TraceLog::GetInstance()->SetDisabled();
 103     base::RunLoop run_loop;
 104     base::debug::TraceLog::GetInstance()->Flush(
 105         base::Bind(&GLHelperTest::TraceDataCB,
 106                    run_loop.QuitClosure(),
 107                    base::Unretained(&json_data)));
 108     run_loop.Run();
 109     json_data.append("]");
 110
 111     scoped_ptr<base::Value> trace_data(base::JSONReader::Read(json_data));
 112     base::ListValue* list;
 113     CHECK(trace_data->GetAsList(&list));
 114     for (size_t i = 0; i < list->GetSize(); i++) {
 115       base::Value* item = NULL;
 116       if (list->Get(i, &item)) {
 117         base::DictionaryValue* dict;
 118         CHECK(item->GetAsDictionary(&dict));
 119         std::string name;
 120         CHECK(dict->GetString("name", &name));
 121         std::string trace_type;
 122         CHECK(dict->GetString("ph", &trace_type));
 123         // Count all except END traces, as they come in BEGIN/END pairs.
 124         if (trace_type != "E")
 125           (*event_counts)[name]++;
 126         VLOG(1) << "trace name: " << name;
 127       }
 128     }
 129   }
 130
 131   // Bicubic filter kernel function.
 132   static float Bicubic(float x) {
 133     const float a = -0.5;
 134     x = std::abs(x);
 135     float x2 = x * x;
 136     float x3 = x2 * x;
 137     if (x <= 1) {
 138       return (a + 2) * x3 - (a + 3) * x2 + 1;
 139     } else if (x < 2) {
 140       return a * x3 - 5 * a * x2 + 8 * a * x - 4 * a;
 141     } else {
 142       return 0.0f;
 143     }
 144   }
 145
 146   // Look up a single channel value. Works for 4-channel and single channel
 147   // bitmaps.  Clamp x/y.
 148   int Channel(SkBitmap* pixels, int x, int y, int c) {
 149     if (pixels->bytesPerPixel() == 4) {
 150       uint32* data =
 151           pixels->getAddr32(std::max(0, std::min(x, pixels->width() - 1)),
 152                             std::max(0, std::min(y, pixels->height() - 1)));
 153       return (*data) >> (c * 8) & 0xff;
 154     } else {
 155       DCHECK_EQ(pixels->bytesPerPixel(), 1);
 156       DCHECK_EQ(c, 0);
 157       return *pixels->getAddr8(std::max(0, std::min(x, pixels->width() - 1)),
 158                                std::max(0, std::min(y, pixels->height() - 1)));
 159     }
 160   }
 161
 162   // Set a single channel value. Works for 4-channel and single channel
 163   // bitmaps.  Clamp x/y.
 164   void SetChannel(SkBitmap* pixels, int x, int y, int c, int v) {
 165     DCHECK_GE(x, 0);
 166     DCHECK_GE(y, 0);
 167     DCHECK_LT(x, pixels->width());
 168     DCHECK_LT(y, pixels->height());
 169     if (pixels->bytesPerPixel() == 4) {
 170       uint32* data = pixels->getAddr32(x, y);
 171       v = std::max(0, std::min(v, 255));
 172       *data = (*data & ~(0xffu << (c * 8))) | (v << (c * 8));
 173     } else {
 174       DCHECK_EQ(pixels->bytesPerPixel(), 1);
 175       DCHECK_EQ(c, 0);
 176       uint8* data = pixels->getAddr8(x, y);
 177       v = std::max(0, std::min(v, 255));
 178       *data = v;
 179     }
 180   }
 181
 182   // Print all the R, G, B or A values from an SkBitmap in a
 183   // human-readable format.
 184   void PrintChannel(SkBitmap* pixels, int c) {
 185     for (int y = 0; y < pixels->height(); y++) {
 186       std::string formatted;
 187       for (int x = 0; x < pixels->width(); x++) {
 188         formatted.append(base::StringPrintf("%3d, ", Channel(pixels, x, y, c)));
 189       }
 190       LOG(ERROR) << formatted;
 191     }
 192   }
 193
 194   // Print out the individual steps of a scaler pipeline.
 195   std::string PrintStages(
 196       const std::vector<GLHelperScaling::ScalerStage>& scaler_stages) {
 197     std::string ret;
 198     for (size_t i = 0; i < scaler_stages.size(); i++) {
 199       ret.append(base::StringPrintf("%dx%d -> %dx%d ",
 200                                     scaler_stages[i].src_size.width(),
 201                                     scaler_stages[i].src_size.height(),
 202                                     scaler_stages[i].dst_size.width(),
 203                                     scaler_stages[i].dst_size.height()));
 204       bool xy_matters = false;
 205       switch (scaler_stages[i].shader) {
 206         case GLHelperScaling::SHADER_BILINEAR:
 207           ret.append("bilinear");
 208           break;
 209         case GLHelperScaling::SHADER_BILINEAR2:
 210           ret.append("bilinear2");
 211           xy_matters = true;
 212           break;
 213         case GLHelperScaling::SHADER_BILINEAR3:
 214           ret.append("bilinear3");
 215           xy_matters = true;
 216           break;
 217         case GLHelperScaling::SHADER_BILINEAR4:
 218           ret.append("bilinear4");
 219           xy_matters = true;
 220           break;
 221         case GLHelperScaling::SHADER_BILINEAR2X2:
 222           ret.append("bilinear2x2");
 223           break;
 224         case GLHelperScaling::SHADER_BICUBIC_UPSCALE:
 225           ret.append("bicubic upscale");
 226           xy_matters = true;
 227           break;
 228         case GLHelperScaling::SHADER_BICUBIC_HALF_1D:
 229           ret.append("bicubic 1/2");
 230           xy_matters = true;
 231           break;
 232         case GLHelperScaling::SHADER_PLANAR:
 233           ret.append("planar");
 234           break;
 235         case GLHelperScaling::SHADER_YUV_MRT_PASS1:
 236           ret.append("rgb2yuv pass 1");
 237           break;
 238         case GLHelperScaling::SHADER_YUV_MRT_PASS2:
 239           ret.append("rgb2yuv pass 2");
 240           break;
 241       }
 242
 243       if (xy_matters) {
 244         if (scaler_stages[i].scale_x) {
 245           ret.append(" X");
 246         } else {
 247           ret.append(" Y");
 248         }
 249       }
 250       ret.append("\n");
 251     }
 252     return ret;
 253   }
 254
 255   bool CheckScale(double scale, int samples, bool already_scaled) {
 256     // 1:1 is valid if there is one sample.
 257     if (samples == 1 && scale == 1.0) {
 258       return true;
 259     }
 260     // Is it an exact down-scale (50%, 25%, etc.?)
 261     if (scale == 2.0 * samples) {
 262       return true;
 263     }
 264     // Upscales, only valid if we haven't already scaled in this dimension.
 265     if (!already_scaled) {
 266       // Is it a valid bilinear upscale?
 267       if (samples == 1 && scale <= 1.0) {
 268         return true;
 269       }
 270       // Multi-sample upscale-downscale combination?
 271       if (scale > samples / 2.0 && scale < samples) {
 272         return true;
 273       }
 274     }
 275     return false;
 276   }
 277
 278   // Make sure that the stages of the scaler pipeline are sane.
 279   void ValidateScalerStages(
 280       content::GLHelper::ScalerQuality quality,
 281       const std::vector<GLHelperScaling::ScalerStage>& scaler_stages,
 282       const gfx::Size& dst_size,
 283       const std::string& message) {
 284     bool previous_error = HasFailure();
 285     // First, check that the input size for each stage is equal to
 286     // the output size of the previous stage.
 287     for (size_t i = 1; i < scaler_stages.size(); i++) {
 288       EXPECT_EQ(scaler_stages[i - 1].dst_size.width(),
 289                 scaler_stages[i].src_size.width());
 290       EXPECT_EQ(scaler_stages[i - 1].dst_size.height(),
 291                 scaler_stages[i].src_size.height());
 292       EXPECT_EQ(scaler_stages[i].src_subrect.x(), 0);
 293       EXPECT_EQ(scaler_stages[i].src_subrect.y(), 0);
 294       EXPECT_EQ(scaler_stages[i].src_subrect.width(),
 295                 scaler_stages[i].src_size.width());
 296       EXPECT_EQ(scaler_stages[i].src_subrect.height(),
 297                 scaler_stages[i].src_size.height());
 298     }
 299
 300     // Check the output size matches the destination of the last stage
 301     EXPECT_EQ(scaler_stages[scaler_stages.size() - 1].dst_size.width(),
 302               dst_size.width());
 303     EXPECT_EQ(scaler_stages[scaler_stages.size() - 1].dst_size.height(),
 304               dst_size.height());
 305
 306     // Used to verify that up-scales are not attempted after some
 307     // other scale.
 308     bool scaled_x = false;
 309     bool scaled_y = false;
 310
 311     for (size_t i = 0; i < scaler_stages.size(); i++) {
 312       // Note: 2.0 means scaling down by 50%
 313       double x_scale =
 314           static_cast<double>(scaler_stages[i].src_subrect.width()) /
 315           static_cast<double>(scaler_stages[i].dst_size.width());
 316       double y_scale =
 317           static_cast<double>(scaler_stages[i].src_subrect.height()) /
 318           static_cast<double>(scaler_stages[i].dst_size.height());
 319
 320       int x_samples = 0;
 321       int y_samples = 0;
 322
 323       // Codify valid scale operations.
 324       switch (scaler_stages[i].shader) {
 325         case GLHelperScaling::SHADER_PLANAR:
 326         case GLHelperScaling::SHADER_YUV_MRT_PASS1:
 327         case GLHelperScaling::SHADER_YUV_MRT_PASS2:
 328           EXPECT_TRUE(false) << "Invalid shader.";
 329           break;
 330
 331         case GLHelperScaling::SHADER_BILINEAR:
 332           if (quality != content::GLHelper::SCALER_QUALITY_FAST) {
 333             x_samples = 1;
 334             y_samples = 1;
 335           }
 336           break;
 337         case GLHelperScaling::SHADER_BILINEAR2:
 338           x_samples = 2;
 339           y_samples = 1;
 340           break;
 341         case GLHelperScaling::SHADER_BILINEAR3:
 342           x_samples = 3;
 343           y_samples = 1;
 344           break;
 345         case GLHelperScaling::SHADER_BILINEAR4:
 346           x_samples = 4;
 347           y_samples = 1;
 348           break;
 349         case GLHelperScaling::SHADER_BILINEAR2X2:
 350           x_samples = 2;
 351           y_samples = 2;
 352           break;
 353         case GLHelperScaling::SHADER_BICUBIC_UPSCALE:
 354           if (scaler_stages[i].scale_x) {
 355             EXPECT_LT(x_scale, 1.0);
 356             EXPECT_EQ(y_scale, 1.0);
 357           } else {
 358             EXPECT_EQ(x_scale, 1.0);
 359             EXPECT_LT(y_scale, 1.0);
 360           }
 361           break;
 362         case GLHelperScaling::SHADER_BICUBIC_HALF_1D:
 363           if (scaler_stages[i].scale_x) {
 364             EXPECT_EQ(x_scale, 2.0);
 365             EXPECT_EQ(y_scale, 1.0);
 366           } else {
 367             EXPECT_EQ(x_scale, 1.0);
 368             EXPECT_EQ(y_scale, 2.0);
 369           }
 370           break;
 371       }
 372
 373       if (!scaler_stages[i].scale_x) {
 374         std::swap(x_samples, y_samples);
 375       }
 376
 377       if (x_samples) {
 378         EXPECT_TRUE(CheckScale(x_scale, x_samples, scaled_x))
 379             << "x_scale = " << x_scale;
 380       }
 381       if (y_samples) {
 382         EXPECT_TRUE(CheckScale(y_scale, y_samples, scaled_y))
 383             << "y_scale = " << y_scale;
 384       }
 385
 386       if (x_scale != 1.0) {
 387         scaled_x = true;
 388       }
 389       if (y_scale != 1.0) {
 390         scaled_y = true;
 391       }
 392     }
 393
 394     if (HasFailure() && !previous_error) {
 395       LOG(ERROR) << "Invalid scaler stages: " << message;
 396       LOG(ERROR) << "Scaler stages:";
 397       LOG(ERROR) << PrintStages(scaler_stages);
 398     }
 399   }
 400
 401   // Compares two bitmaps taking color types into account. Checks whether each
 402   // component of each pixel is no more than |maxdiff| apart. If bitmaps are not
 403   // similar enough, prints out |truth|, |other|, |source|, |scaler_stages|
 404   // and |message|.
 405   void Compare(SkBitmap* truth,
 406                SkBitmap* other,
 407                int maxdiff,
 408                SkBitmap* source,
 409                const std::vector<GLHelperScaling::ScalerStage>& scaler_stages,
 410                std::string message) {
 411     EXPECT_EQ(truth->width(), other->width());
 412     EXPECT_EQ(truth->height(), other->height());
 413     bool swizzle = (truth->colorType() == kRGBA_8888_SkColorType &&
 414                     other->colorType() == kBGRA_8888_SkColorType) ||
 415                    (truth->colorType() == kBGRA_8888_SkColorType &&
 416                     other->colorType() == kRGBA_8888_SkColorType);
 417     EXPECT_TRUE(swizzle || truth->colorType() == other->colorType());
 418     int bpp = truth->bytesPerPixel();
 419     for (int x = 0; x < truth->width(); x++) {
 420       for (int y = 0; y < truth->height(); y++) {
 421         for (int c = 0; c < bpp; c++) {
 422           int a = Channel(truth, x, y, c);
 423           // swizzle when comparing if needed
 424           int b = swizzle && (c == 0 || c == 2)
 425                       ? Channel(other, x, y, (c + 2) & 2)
 426                       : Channel(other, x, y, c);
 427           EXPECT_NEAR(a, b, maxdiff) << " x=" << x << " y=" << y << " c=" << c
 428                                      << " " << message;
 429           if (std::abs(a - b) > maxdiff) {
 430             LOG(ERROR) << "-------expected--------";
 431             for (int i = 0; i < bpp; i++) {
 432               LOG(ERROR) << "Channel " << i << ":";
 433               PrintChannel(truth, i);
 434             }
 435             LOG(ERROR) << "-------actual--------";
 436             for (int i = 0; i < bpp; i++) {
 437               LOG(ERROR) << "Channel " << i << ":";
 438               PrintChannel(other, i);
 439             }
 440             if (source) {
 441               LOG(ERROR) << "-------original--------";
 442               for (int i = 0; i < source->bytesPerPixel(); i++) {
 443                 LOG(ERROR) << "Channel " << i << ":";
 444                 PrintChannel(source, i);
 445               }
 446             }
 447             LOG(ERROR) << "-----Scaler stages------";
 448             LOG(ERROR) << PrintStages(scaler_stages);
 449             return;
 450           }
 451         }
 452       }
 453     }
 454   }
 455
 456   // Get a single R, G, B or A value as a float.
 457   float ChannelAsFloat(SkBitmap* pixels, int x, int y, int c) {
 458     return Channel(pixels, x, y, c) / 255.0;
 459   }
 460
 461   // Works like a GL_LINEAR lookup on an SkBitmap.
 462   float Bilinear(SkBitmap* pixels, float x, float y, int c) {
 463     x -= 0.5;
 464     y -= 0.5;
 465     int base_x = static_cast<int>(floorf(x));
 466     int base_y = static_cast<int>(floorf(y));
 467     x -= base_x;
 468     y -= base_y;
 469     return (ChannelAsFloat(pixels, base_x, base_y, c) * (1 - x) * (1 - y) +
 470             ChannelAsFloat(pixels, base_x + 1, base_y, c) * x * (1 - y) +
 471             ChannelAsFloat(pixels, base_x, base_y + 1, c) * (1 - x) * y +
 472             ChannelAsFloat(pixels, base_x + 1, base_y + 1, c) * x * y);
 473   }
 474
 475   // Encodes an RGBA bitmap to grayscale.
 476   // Reference implementation for
 477   // GLHelper::CopyToTextureImpl::EncodeTextureAsGrayscale.
 478   void EncodeToGrayscaleSlow(SkBitmap* input, SkBitmap* output) {
 479     const float kRGBtoGrayscaleColorWeights[3] = {0.213f, 0.715f, 0.072f};
 480     CHECK_EQ(kAlpha_8_SkColorType, output->colorType());
 481     CHECK_EQ(input->width(), output->width());
 482     CHECK_EQ(input->height(), output->height());
 483     CHECK_EQ(input->colorType(), kRGBA_8888_SkColorType);
 484
 485     for (int dst_y = 0; dst_y < output->height(); dst_y++) {
 486       for (int dst_x = 0; dst_x < output->width(); dst_x++) {
 487         float c0 = ChannelAsFloat(input, dst_x, dst_y, 0);
 488         float c1 = ChannelAsFloat(input, dst_x, dst_y, 1);
 489         float c2 = ChannelAsFloat(input, dst_x, dst_y, 2);
 490         float value = c0 * kRGBtoGrayscaleColorWeights[0] +
 491                       c1 * kRGBtoGrayscaleColorWeights[1] +
 492                       c2 * kRGBtoGrayscaleColorWeights[2];
 493         SetChannel(
 494             output, dst_x, dst_y, 0, static_cast<int>(value * 255.0f + 0.5f));
 495       }
 496     }
 497   }
 498
 499   // Very slow bicubic / bilinear scaler for reference.
 500   void ScaleSlow(SkBitmap* input,
 501                  SkBitmap* output,
 502                  content::GLHelper::ScalerQuality quality) {
 503     float xscale = static_cast<float>(input->width()) / output->width();
 504     float yscale = static_cast<float>(input->height()) / output->height();
 505     float clamped_xscale = xscale < 1.0 ? 1.0 : 1.0 / xscale;
 506     float clamped_yscale = yscale < 1.0 ? 1.0 : 1.0 / yscale;
 507     for (int dst_y = 0; dst_y < output->height(); dst_y++) {
 508       for (int dst_x = 0; dst_x < output->width(); dst_x++) {
 509         for (int channel = 0; channel < 4; channel++) {
 510           float dst_x_in_src = (dst_x + 0.5f) * xscale;
 511           float dst_y_in_src = (dst_y + 0.5f) * yscale;
 512
 513           float value = 0.0f;
 514           float sum = 0.0f;
 515           switch (quality) {
 516             case content::GLHelper::SCALER_QUALITY_BEST:
 517               for (int src_y = -10; src_y < input->height() + 10; ++src_y) {
 518                 float coeff_y =
 519                     Bicubic((src_y + 0.5f - dst_y_in_src) * clamped_yscale);
 520                 if (coeff_y == 0.0f) {
 521                   continue;
 522                 }
 523                 for (int src_x = -10; src_x < input->width() + 10; ++src_x) {
 524                   float coeff =
 525                       coeff_y *
 526                       Bicubic((src_x + 0.5f - dst_x_in_src) * clamped_xscale);
 527                   if (coeff == 0.0f) {
 528                     continue;
 529                   }
 530                   sum += coeff;
 531                   float c = ChannelAsFloat(input, src_x, src_y, channel);
 532                   value += c * coeff;
 533                 }
 534               }
 535               break;
 536
 537             case content::GLHelper::SCALER_QUALITY_GOOD: {
 538               int xshift = 0, yshift = 0;
 539               while ((output->width() << xshift) < input->width()) {
 540                 xshift++;
 541               }
 542               while ((output->height() << yshift) < input->height()) {
 543                 yshift++;
 544               }
 545               int xmag = 1 << xshift;
 546               int ymag = 1 << yshift;
 547               if (xmag == 4 && output->width() * 3 >= input->width()) {
 548                 xmag = 3;
 549               }
 550               if (ymag == 4 && output->height() * 3 >= input->height()) {
 551                 ymag = 3;
 552               }
 553               for (int x = 0; x < xmag; x++) {
 554                 for (int y = 0; y < ymag; y++) {
 555                   value += Bilinear(input,
 556                                     (dst_x * xmag + x + 0.5) * xscale / xmag,
 557                                     (dst_y * ymag + y + 0.5) * yscale / ymag,
 558                                     channel);
 559                   sum += 1.0;
 560                 }
 561               }
 562               break;
 563             }
 564
 565             case content::GLHelper::SCALER_QUALITY_FAST:
 566               value = Bilinear(input, dst_x_in_src, dst_y_in_src, channel);
 567               sum = 1.0;
 568           }
 569           value /= sum;
 570           SetChannel(output,
 571                      dst_x,
 572                      dst_y,
 573                      channel,
 574                      static_cast<int>(value * 255.0f + 0.5f));
 575         }
 576       }
 577     }
 578   }
 579
 580   void FlipSKBitmap(SkBitmap* bitmap) {
 581     int bpp = bitmap->bytesPerPixel();
 582     DCHECK(bpp == 4 || bpp == 1);
 583     int top_line = 0;
 584     int bottom_line = bitmap->height() - 1;
 585     while (top_line < bottom_line) {
 586       for (int x = 0; x < bitmap->width(); x++) {
 587         bpp == 4 ? std::swap(*bitmap->getAddr32(x, top_line),
 588                              *bitmap->getAddr32(x, bottom_line))
 589                  : std::swap(*bitmap->getAddr8(x, top_line),
 590                              *bitmap->getAddr8(x, bottom_line));
 591       }
 592       top_line++;
 593       bottom_line--;
 594     }
 595   }
 596
 597   // Swaps red and blue channels in each pixel in a 32-bit bitmap.
 598   void SwizzleSKBitmap(SkBitmap* bitmap) {
 599     int bpp = bitmap->bytesPerPixel();
 600     DCHECK(bpp == 4);
 601     for (int y = 0; y < bitmap->height(); y++) {
 602       for (int x = 0; x < bitmap->width(); x++) {
 603         // Swap channels 0 and 2 (red and blue)
 604         int c0 = Channel(bitmap, x, y, 0);
 605         int c2 = Channel(bitmap, x, y, 2);
 606         SetChannel(bitmap, x, y, 2, c0);
 607         SetChannel(bitmap, x, y, 0, c2);
 608       }
 609     }
 610   }
 611
 612   // gl_helper scales recursively, so we'll need to do that
 613   // in the reference implementation too.
 614   void ScaleSlowRecursive(SkBitmap* input,
 615                           SkBitmap* output,
 616                           content::GLHelper::ScalerQuality quality) {
 617     if (quality == content::GLHelper::SCALER_QUALITY_FAST ||
 618         quality == content::GLHelper::SCALER_QUALITY_GOOD) {
 619       ScaleSlow(input, output, quality);
 620       return;
 621     }
 622
 623     float xscale = static_cast<float>(output->width()) / input->width();
 624
 625     // This corresponds to all the operations we can do directly.
 626     float yscale = static_cast<float>(output->height()) / input->height();
 627     if ((xscale == 1.0f && yscale == 1.0f) ||
 628         (xscale == 0.5f && yscale == 1.0f) ||
 629         (xscale == 1.0f && yscale == 0.5f) ||
 630         (xscale >= 1.0f && yscale == 1.0f) ||
 631         (xscale == 1.0f && yscale >= 1.0f)) {
 632       ScaleSlow(input, output, quality);
 633       return;
 634     }
 635
 636     // Now we break the problem down into smaller pieces, using the
 637     // operations available.
 638     int xtmp = input->width();
 639     int ytmp = input->height();
 640
 641     if (output->height() != input->height()) {
 642       ytmp = output->height();
 643       while (ytmp < input->height() && ytmp * 2 != input->height()) {
 644         ytmp += ytmp;
 645       }
 646     } else {
 647       xtmp = output->width();
 648       while (xtmp < input->width() && xtmp * 2 != input->width()) {
 649         xtmp += xtmp;
 650       }
 651     }
 652
 653     SkBitmap tmp;
 654     tmp.allocN32Pixels(xtmp, ytmp);
 655
 656     ScaleSlowRecursive(input, &tmp, quality);
 657     ScaleSlowRecursive(&tmp, output, quality);
 658   }
 659
 660   // Creates an RGBA SkBitmap
 661   scoped_ptr<SkBitmap> CreateTestBitmap(int width,
 662                                         int height,
 663                                         int test_pattern) {
 664     scoped_ptr<SkBitmap> bitmap(new SkBitmap);
 665     bitmap->allocPixels(SkImageInfo::Make(
 666         width, height, kRGBA_8888_SkColorType, kPremul_SkAlphaType));
 667
 668     for (int x = 0; x < width; ++x) {
 669       for (int y = 0; y < height; ++y) {
 670         switch (test_pattern) {
 671           case 0:  // Smooth test pattern
 672             SetChannel(bitmap.get(), x, y, 0, x * 10);
 673             SetChannel(bitmap.get(), x, y, 0, y == 0 ? x * 50 : x * 10);
 674             SetChannel(bitmap.get(), x, y, 1, y * 10);
 675             SetChannel(bitmap.get(), x, y, 2, (x + y) * 10);
 676             SetChannel(bitmap.get(), x, y, 3, 255);
 677             break;
 678           case 1:  // Small blocks
 679             SetChannel(bitmap.get(), x, y, 0, x & 1 ? 255 : 0);
 680             SetChannel(bitmap.get(), x, y, 1, y & 1 ? 255 : 0);
 681             SetChannel(bitmap.get(), x, y, 2, (x + y) & 1 ? 255 : 0);
 682             SetChannel(bitmap.get(), x, y, 3, 255);
 683             break;
 684           case 2:  // Medium blocks
 685             SetChannel(bitmap.get(), x, y, 0, 10 + x / 2 * 50);
 686             SetChannel(bitmap.get(), x, y, 1, 10 + y / 3 * 50);
 687             SetChannel(bitmap.get(), x, y, 2, (x + y) / 5 * 50 + 5);
 688             SetChannel(bitmap.get(), x, y, 3, 255);
 689             break;
 690         }
 691       }
 692     }
 693     return bitmap.Pass();
 694   }
 695
 696   // Binds texture and framebuffer and loads the bitmap pixels into the texture.
 697   void BindTextureAndFrameBuffer(WebGLId texture,
 698                                  WebGLId framebuffer,
 699                                  SkBitmap* bitmap,
 700                                  int width,
 701                                  int height) {
 702     context_->bindFramebuffer(GL_FRAMEBUFFER, framebuffer);
 703     context_->bindTexture(GL_TEXTURE_2D, texture);
 704     context_->texImage2D(GL_TEXTURE_2D,
 705                          0,
 706                          GL_RGBA,
 707                          width,
 708                          height,
 709                          0,
 710                          GL_RGBA,
 711                          GL_UNSIGNED_BYTE,
 712                          bitmap->getPixels());
 713   }
 714
 715   // Create a test image, transform it using
 716   // GLHelper::CropScaleReadbackAndCleanTexture and a reference implementation
 717   // and compare the results.
 718   void TestCropScaleReadbackAndCleanTexture(int xsize,
 719                                             int ysize,
 720                                             int scaled_xsize,
 721                                             int scaled_ysize,
 722                                             int test_pattern,
 723                                             SkColorType out_color_type,
 724                                             bool swizzle,
 725                                             size_t quality_index) {
 726     DCHECK(out_color_type == kAlpha_8_SkColorType ||
 727            out_color_type == kRGBA_8888_SkColorType ||
 728            out_color_type == kBGRA_8888_SkColorType);
 729     WebGLId src_texture = context_->createTexture();
 730     WebGLId framebuffer = context_->createFramebuffer();
 731     scoped_ptr<SkBitmap> input_pixels =
 732         CreateTestBitmap(xsize, ysize, test_pattern).Pass();
 733     BindTextureAndFrameBuffer(
 734         src_texture, framebuffer, input_pixels.get(), xsize, ysize);
 735
 736     std::string message = base::StringPrintf(
 737         "input size: %dx%d "
 738         "output size: %dx%d "
 739         "pattern: %d , quality: %s, "
 740         "out_color_type: %d",
 741         xsize,
 742         ysize,
 743         scaled_xsize,
 744         scaled_ysize,
 745         test_pattern,
 746         kQualityNames[quality_index],
 747         out_color_type);
 748
 749     // Transform the bitmap using GLHelper::CropScaleReadbackAndCleanTexture.
 750     SkBitmap output_pixels;
 751     output_pixels.allocPixels(SkImageInfo::Make(
 752         scaled_xsize, scaled_ysize, out_color_type, kPremul_SkAlphaType));
 753     base::RunLoop run_loop;
 754     gfx::Size encoded_texture_size;
 755     helper_->CropScaleReadbackAndCleanTexture(
 756         src_texture,
 757         gfx::Size(xsize, ysize),
 758         gfx::Rect(xsize, ysize),
 759         gfx::Size(scaled_xsize, scaled_ysize),
 760         static_cast<unsigned char*>(output_pixels.getPixels()),
 761         out_color_type,
 762         base::Bind(&callcallback, run_loop.QuitClosure()),
 763         kQualities[quality_index]);
 764     run_loop.Run();
 765     // CropScaleReadbackAndCleanTexture flips the pixels. Flip them back.
 766     FlipSKBitmap(&output_pixels);
 767
 768     // If the bitmap shouldn't have changed - compare against input.
 769     if (xsize == scaled_xsize && ysize == scaled_ysize &&
 770         out_color_type != kAlpha_8_SkColorType) {
 771       const std::vector<GLHelperScaling::ScalerStage> dummy_stages;
 772       Compare(input_pixels.get(),
 773               &output_pixels,
 774               0,
 775               NULL,
 776               dummy_stages,
 777               message + " comparing against input");
 778       return;
 779     }
 780
 781     // Now transform the bitmap using the reference implementation.
 782     SkBitmap scaled_pixels;
 783     scaled_pixels.allocPixels(SkImageInfo::Make(scaled_xsize,
 784                                                 scaled_ysize,
 785                                                 kRGBA_8888_SkColorType,
 786                                                 kPremul_SkAlphaType));
 787     SkBitmap truth_pixels;
 788     // Step 1: Scale
 789     ScaleSlowRecursive(
 790         input_pixels.get(), &scaled_pixels, kQualities[quality_index]);
 791     // Step 2: Encode to grayscale if needed.
 792     if (out_color_type == kAlpha_8_SkColorType) {
 793       truth_pixels.allocPixels(SkImageInfo::Make(
 794           scaled_xsize, scaled_ysize, out_color_type, kPremul_SkAlphaType));
 795       EncodeToGrayscaleSlow(&scaled_pixels, &truth_pixels);
 796     } else {
 797       truth_pixels = scaled_pixels;
 798     }
 799
 800     // Now compare the results.
 801     SkAutoLockPixels lock_input(truth_pixels);
 802     const std::vector<GLHelperScaling::ScalerStage> dummy_stages;
 803     Compare(&truth_pixels,
 804             &output_pixels,
 805             2,
 806             input_pixels.get(),
 807             dummy_stages,
 808             message + " comparing against transformed/scaled");
 809
 810     context_->deleteTexture(src_texture);
 811     context_->deleteFramebuffer(framebuffer);
 812   }
 813
 814   // Scaling test: Create a test image, scale it using GLHelperScaling
 815   // and a reference implementation and compare the results.
 816   void TestScale(int xsize,
 817                  int ysize,
 818                  int scaled_xsize,
 819                  int scaled_ysize,
 820                  int test_pattern,
 821                  size_t quality_index,
 822                  bool flip) {
 823     WebGLId src_texture = context_->createTexture();
 824     WebGLId framebuffer = context_->createFramebuffer();
 825     scoped_ptr<SkBitmap> input_pixels =
 826         CreateTestBitmap(xsize, ysize, test_pattern).Pass();
 827     BindTextureAndFrameBuffer(
 828         src_texture, framebuffer, input_pixels.get(), xsize, ysize);
 829
 830     std::string message = base::StringPrintf(
 831         "input size: %dx%d "
 832         "output size: %dx%d "
 833         "pattern: %d quality: %s",
 834         xsize,
 835         ysize,
 836         scaled_xsize,
 837         scaled_ysize,
 838         test_pattern,
 839         kQualityNames[quality_index]);
 840
 841     std::vector<GLHelperScaling::ScalerStage> stages;
 842     helper_scaling_->ComputeScalerStages(kQualities[quality_index],
 843                                          gfx::Size(xsize, ysize),
 844                                          gfx::Rect(0, 0, xsize, ysize),
 845                                          gfx::Size(scaled_xsize, scaled_ysize),
 846                                          flip,
 847                                          false,
 848                                          &stages);
 849     ValidateScalerStages(kQualities[quality_index],
 850                          stages,
 851                          gfx::Size(scaled_xsize, scaled_ysize),
 852                          message);
 853
 854     WebGLId dst_texture =
 855         helper_->CopyAndScaleTexture(src_texture,
 856                                      gfx::Size(xsize, ysize),
 857                                      gfx::Size(scaled_xsize, scaled_ysize),
 858                                      flip,
 859                                      kQualities[quality_index]);
 860
 861     SkBitmap output_pixels;
 862     output_pixels.allocPixels(SkImageInfo::Make(scaled_xsize,
 863                                                 scaled_ysize,
 864                                                 kRGBA_8888_SkColorType,
 865                                                 kPremul_SkAlphaType));
 866
 867     helper_->ReadbackTextureSync(
 868         dst_texture,
 869         gfx::Rect(0, 0, scaled_xsize, scaled_ysize),
 870         static_cast<unsigned char*>(output_pixels.getPixels()),
 871         kRGBA_8888_SkColorType);
 872     if (flip) {
 873       // Flip the pixels back.
 874       FlipSKBitmap(&output_pixels);
 875     }
 876
 877     // If the bitmap shouldn't have changed - compare against input.
 878     if (xsize == scaled_xsize && ysize == scaled_ysize) {
 879       Compare(input_pixels.get(),
 880               &output_pixels,
 881               0,
 882               NULL,
 883               stages,
 884               message + " comparing against input");
 885       return;
 886     }
 887
 888     // Now scale the bitmap using the reference implementation.
 889     SkBitmap truth_pixels;
 890     truth_pixels.allocPixels(SkImageInfo::Make(scaled_xsize,
 891                                                scaled_ysize,
 892                                                kRGBA_8888_SkColorType,
 893                                                kPremul_SkAlphaType));
 894     ScaleSlowRecursive(
 895         input_pixels.get(), &truth_pixels, kQualities[quality_index]);
 896     Compare(&truth_pixels,
 897             &output_pixels,
 898             2,
 899             input_pixels.get(),
 900             stages,
 901             message + " comparing against scaled");
 902
 903     context_->deleteTexture(src_texture);
 904     context_->deleteTexture(dst_texture);
 905     context_->deleteFramebuffer(framebuffer);
 906   }
 907
 908   // Create a scaling pipeline and check that it is made up of
 909   // valid scaling operations.
 910   void TestScalerPipeline(size_t quality,
 911                           int xsize,
 912                           int ysize,
 913                           int dst_xsize,
 914                           int dst_ysize) {
 915     std::vector<GLHelperScaling::ScalerStage> stages;
 916     helper_scaling_->ComputeScalerStages(kQualities[quality],
 917                                          gfx::Size(xsize, ysize),
 918                                          gfx::Rect(0, 0, xsize, ysize),
 919                                          gfx::Size(dst_xsize, dst_ysize),
 920                                          false,
 921                                          false,
 922                                          &stages);
 923     ValidateScalerStages(kQualities[quality],
 924                          stages,
 925                          gfx::Size(dst_xsize, dst_ysize),
 926                          base::StringPrintf(
 927                              "input size: %dx%d "
 928                              "output size: %dx%d "
 929                              "quality: %s",
 930                              xsize,
 931                              ysize,
 932                              dst_xsize,
 933                              dst_ysize,
 934                              kQualityNames[quality]));
 935   }
 936
 937   // Create a scaling pipeline and make sure that the steps
 938   // are exactly the steps we expect.
 939   void CheckPipeline(content::GLHelper::ScalerQuality quality,
 940                      int xsize,
 941                      int ysize,
 942                      int dst_xsize,
 943                      int dst_ysize,
 944                      const std::string& description) {
 945     std::vector<GLHelperScaling::ScalerStage> stages;
 946     helper_scaling_->ComputeScalerStages(quality,
 947                                          gfx::Size(xsize, ysize),
 948                                          gfx::Rect(0, 0, xsize, ysize),
 949                                          gfx::Size(dst_xsize, dst_ysize),
 950                                          false,
 951                                          false,
 952                                          &stages);
 953     ValidateScalerStages(content::GLHelper::SCALER_QUALITY_GOOD,
 954                          stages,
 955                          gfx::Size(dst_xsize, dst_ysize),
 956                          "");
 957     EXPECT_EQ(PrintStages(stages), description);
 958   }
 959
 960   // Note: Left/Right means Top/Bottom when used for Y dimension.
 961   enum Margin {
 962     MarginLeft,
 963     MarginMiddle,
 964     MarginRight,
 965     MarginInvalid,
 966   };
 967
 968   static Margin NextMargin(Margin m) {
 969     switch (m) {
 970       case MarginLeft:
 971         return MarginMiddle;
 972       case MarginMiddle:
 973         return MarginRight;
 974       case MarginRight:
 975         return MarginInvalid;
 976       default:
 977         return MarginInvalid;
 978     }
 979   }
 980
 981   int compute_margin(int insize, int outsize, Margin m) {
 982     int available = outsize - insize;
 983     switch (m) {
 984       default:
 985         EXPECT_TRUE(false) << "This should not happen.";
 986         return 0;
 987       case MarginLeft:
 988         return 0;
 989       case MarginMiddle:
 990         return (available / 2) & ~1;
 991       case MarginRight:
 992         return available;
 993     }
 994   }
 995
 996   // Convert 0.0 - 1.0 to 0 - 255
 997   int float_to_byte(float v) {
 998     int ret = static_cast<int>(floorf(v * 255.0f + 0.5f));
 999     if (ret < 0) {
1000       return 0;
1001     }
1002     if (ret > 255) {
1003       return 255;
1004     }
1005     return ret;
1006   }
1007
1008   static void callcallback(const base::Callback<void()>& callback,
1009                            bool result) {
1010     callback.Run();
1011   }
1012
1013   void PrintPlane(unsigned char* plane, int xsize, int stride, int ysize) {
1014     for (int y = 0; y < ysize; y++) {
1015       std::string formatted;
1016       for (int x = 0; x < xsize; x++) {
1017         formatted.append(base::StringPrintf("%3d, ", plane[y * stride + x]));
1018       }
1019       LOG(ERROR) << formatted << "   (" << (plane + y * stride) << ")";
1020     }
1021   }
1022
1023   // Compare two planes make sure that each component of each pixel
1024   // is no more than |maxdiff| apart.
1025   void ComparePlane(unsigned char* truth,
1026                     unsigned char* other,
1027                     int maxdiff,
1028                     int xsize,
1029                     int stride,
1030                     int ysize,
1031                     SkBitmap* source,
1032                     std::string message) {
1033     int truth_stride = stride;
1034     for (int x = 0; x < xsize; x++) {
1035       for (int y = 0; y < ysize; y++) {
1036         int a = other[y * stride + x];
1037         int b = truth[y * stride + x];
1038         EXPECT_NEAR(a, b, maxdiff) << " x=" << x << " y=" << y << " "
1039                                    << message;
1040         if (std::abs(a - b) > maxdiff) {
1041           LOG(ERROR) << "-------expected--------";
1042           PrintPlane(truth, xsize, truth_stride, ysize);
1043           LOG(ERROR) << "-------actual--------";
1044           PrintPlane(other, xsize, stride, ysize);
1045           if (source) {
1046             LOG(ERROR) << "-------before yuv conversion: red--------";
1047             PrintChannel(source, 0);
1048             LOG(ERROR) << "-------before yuv conversion: green------";
1049             PrintChannel(source, 1);
1050             LOG(ERROR) << "-------before yuv conversion: blue-------";
1051             PrintChannel(source, 2);
1052           }
1053           return;
1054         }
1055       }
1056     }
1057   }
1058
1059   void DrawGridToBitmap(int w, int h,
1060                         SkColor background_color,
1061                         SkColor grid_color,
1062                         int grid_pitch,
1063                         int grid_width,
1064                         SkBitmap& bmp) {
1065     ASSERT_GT(grid_pitch, 0);
1066     ASSERT_GT(grid_width, 0);
1067     ASSERT_NE(background_color, grid_color);
1068
1069     for (int y = 0; y < h; ++y) {
1070       bool y_on_grid = ((y % grid_pitch) < grid_width);
1071
1072       for (int x = 0; x < w; ++x) {
1073         bool on_grid = (y_on_grid || ((x % grid_pitch) < grid_width));
1074
1075         if (bmp.colorType() == kRGBA_8888_SkColorType ||
1076             bmp.colorType() == kBGRA_8888_SkColorType) {
1077           *bmp.getAddr32(x, y) = (on_grid ? grid_color : background_color);
1078         } else if (bmp.colorType() == kRGB_565_SkColorType) {
1079           *bmp.getAddr16(x, y) = (on_grid ? grid_color : background_color);
1080         }
1081       }
1082     }
1083   }
1084
1085   void DrawCheckerToBitmap(int w, int h,
1086                            SkColor color1, SkColor color2,
1087                            int rect_w, int rect_h,
1088                            SkBitmap& bmp) {
1089     ASSERT_GT(rect_w, 0);
1090     ASSERT_GT(rect_h, 0);
1091     ASSERT_NE(color1, color2);
1092
1093     for (int y = 0; y < h; ++y) {
1094       bool y_bit = (((y / rect_h) & 0x1) == 0);
1095
1096       for (int x = 0; x < w; ++x) {
1097         bool x_bit = (((x / rect_w) & 0x1) == 0);
1098
1099         bool use_color2 = (x_bit != y_bit);  // xor
1100         if (bmp.colorType() == kRGBA_8888_SkColorType ||
1101             bmp.colorType() == kBGRA_8888_SkColorType) {
1102           *bmp.getAddr32(x, y) = (use_color2 ? color2 : color1);
1103         } else if (bmp.colorType() == kRGB_565_SkColorType) {
1104           *bmp.getAddr16(x, y) = (use_color2 ? color2 : color1);
1105         }
1106       }
1107     }
1108   }
1109
1110   bool ColorComponentsClose(SkColor component1,
1111                             SkColor component2,
1112                             SkColorType color_type) {
1113     int c1 = static_cast<int>(component1);
1114     int c2 = static_cast<int>(component2);
1115     bool result = false;
1116     switch (color_type) {
1117       case kRGBA_8888_SkColorType:
1118       case kBGRA_8888_SkColorType:
1119         result = (std::abs(c1 - c2) == 0);
1120         break;
1121       case kRGB_565_SkColorType:
1122         result = (std::abs(c1 - c2) <= 7);
1123         break;
1124       default:
1125         break;
1126     }
1127     return result;
1128   }
1129
1130   bool ColorsClose(SkColor color1, SkColor color2, SkColorType color_type) {
1131     bool red = ColorComponentsClose(SkColorGetR(color1),
1132                                     SkColorGetR(color2), color_type);
1133     bool green = ColorComponentsClose(SkColorGetG(color1),
1134                                         SkColorGetG(color2), color_type);
1135     bool blue = ColorComponentsClose(SkColorGetB(color1),
1136                                      SkColorGetB(color2), color_type);
1137     bool alpha = ColorComponentsClose(SkColorGetA(color1),
1138                                       SkColorGetA(color2), color_type);
1139     if (color_type == kRGB_565_SkColorType) {
1140       return red && blue && green;
1141     }
1142     return red && blue && green && alpha;
1143   }
1144
1145   bool IsEqual(const SkBitmap& bmp1, const SkBitmap& bmp2) {
1146     if (bmp1.isNull() && bmp2.isNull())
1147       return true;
1148     if (bmp1.width() != bmp2.width() ||
1149         bmp1.height() != bmp2.height()) {
1150         LOG(ERROR) << "Bitmap geometry check failure";
1151         return false;
1152     }
1153     if (bmp1.colorType() != bmp2.colorType())
1154       return false;
1155
1156     SkAutoLockPixels lock1(bmp1);
1157     SkAutoLockPixels lock2(bmp2);
1158     if (!bmp1.getPixels() || !bmp2.getPixels()) {
1159       LOG(ERROR) << "Empty Bitmap!";
1160       return false;
1161     }
1162     for (int y = 0; y < bmp1.height(); ++y) {
1163       for (int x = 0; x < bmp1.width(); ++x) {
1164         if (!ColorsClose(bmp1.getColor(x,y),
1165                          bmp2.getColor(x,y),
1166                          bmp1.colorType())) {
1167           LOG(ERROR) << "Bitmap color comparision failure";
1168           return false;
1169         }
1170       }
1171     }
1172     return true;
1173   }
1174
1175   void BindAndAttachTextureWithPixels(GLuint src_texture,
1176                                       SkColorType color_type,
1177                                       const gfx::Size& src_size,
1178                                       const SkBitmap& input_pixels) {
1179     context_->bindTexture(GL_TEXTURE_2D, src_texture);
1180     GLenum format = 0;
1181     switch (color_type) {
1182       case kBGRA_8888_SkColorType:
1183         format = GL_BGRA_EXT;
1184         break;
1185       case kRGBA_8888_SkColorType:
1186         format = GL_RGBA;
1187         break;
1188       case kRGB_565_SkColorType:
1189         format = GL_RGB;
1190         break;
1191       default:
1192         NOTREACHED();
1193     }
1194     GLenum type = (color_type == kRGB_565_SkColorType) ?
1195                   GL_UNSIGNED_SHORT_5_6_5 : GL_UNSIGNED_BYTE;
1196     context_->texImage2D(GL_TEXTURE_2D,
1197                          0,
1198                          format,
1199                          src_size.width(),
1200                          src_size.height(),
1201                          0,
1202                          format,
1203                          type,
1204                          input_pixels.getPixels());
1205   }
1206
1207   void ReadBackTexture(GLuint src_texture,
1208                        const gfx::Size& src_size,
1209                        unsigned char* pixels,
1210                        SkColorType color_type,
1211                        bool async) {
1212     if (async) {
1213       base::RunLoop run_loop;
1214       helper_->ReadbackTextureAsync(src_texture,
1215                                     src_size,
1216                                     pixels,
1217                                     color_type,
1218                                     base::Bind(&callcallback,
1219                                                run_loop.QuitClosure()));
1220       run_loop.Run();
1221     } else {
1222       helper_->ReadbackTextureSync(src_texture,
1223                                    gfx::Rect(src_size),
1224                                    pixels,
1225                                    color_type);
1226     }
1227   }
1228   // Test basic format readback.
1229   bool TestTextureFormatReadback(const gfx::Size& src_size,
1230                          SkColorType color_type,
1231                          bool async) {
1232     SkImageInfo info =
1233         SkImageInfo::Make(src_size.width(),
1234                           src_size.height(),
1235                           color_type,
1236                           kPremul_SkAlphaType);
1237     if (!helper_->IsReadbackConfigSupported(color_type)) {
1238       LOG(INFO) << "Skipping test format not supported" << color_type;
1239       return true;
1240     }
1241     WebGLId src_texture = context_->createTexture();
1242     SkBitmap input_pixels;
1243     input_pixels.allocPixels(info);
1244     // Test Pattern-1, Fill with Plain color pattern.
1245     // Erase the input bitmap with red color.
1246     input_pixels.eraseColor(SK_ColorRED);
1247     BindAndAttachTextureWithPixels(src_texture,
1248                                    color_type,
1249                                    src_size,
1250                                    input_pixels);
1251     SkBitmap output_pixels;
1252     output_pixels.allocPixels(info);
1253     // Initialize the output bitmap with Green color.
1254     // When the readback is over output bitmap should have the red color.
1255     output_pixels.eraseColor(SK_ColorGREEN);
1256     uint8* pixels = static_cast<uint8*>(output_pixels.getPixels());
1257     ReadBackTexture(src_texture, src_size, pixels, color_type, async);
1258     bool result = IsEqual(input_pixels, output_pixels);
1259     if (!result) {
1260       LOG(ERROR) << "Bitmap comparision failure Pattern-1";
1261       return false;
1262     }
1263     const int rect_w = 10, rect_h = 4, src_grid_pitch = 10, src_grid_width = 4;
1264     const SkColor color1 = SK_ColorRED, color2 = SK_ColorBLUE;
1265     // Test Pattern-2, Fill with Grid Pattern.
1266     DrawGridToBitmap(src_size.width(), src_size.height(),
1267                    color2, color1,
1268                    src_grid_pitch, src_grid_width,
1269                    input_pixels);
1270     BindAndAttachTextureWithPixels(src_texture,
1271                                    color_type,
1272                                    src_size,
1273                                    input_pixels);
1274     ReadBackTexture(src_texture, src_size, pixels, color_type, async);
1275     result = IsEqual(input_pixels, output_pixels);
1276     if (!result) {
1277       LOG(ERROR) << "Bitmap comparision failure Pattern-2";
1278       return false;
1279     }
1280     // Test Pattern-3, Fill with CheckerBoard Pattern.
1281     DrawCheckerToBitmap(src_size.width(),
1282                     src_size.height(),
1283                     color1,
1284                     color2, rect_w, rect_h, input_pixels);
1285     BindAndAttachTextureWithPixels(src_texture,
1286                                    color_type,
1287                                    src_size,
1288                                    input_pixels);
1289     ReadBackTexture(src_texture, src_size, pixels, color_type, async);
1290     result = IsEqual(input_pixels, output_pixels);
1291     if (!result) {
1292       LOG(ERROR) << "Bitmap comparision failure Pattern-3";
1293       return false;
1294     }
1295     context_->deleteTexture(src_texture);
1296     if (HasFailure()) {
1297       return false;
1298     }
1299     return true;
1300   }
1301
1302   // YUV readback test. Create a test pattern, convert to YUV
1303   // with reference implementation and compare to what gl_helper
1304   // returns.
1305   void TestYUVReadback(int xsize,
1306                        int ysize,
1307                        int output_xsize,
1308                        int output_ysize,
1309                        int xmargin,
1310                        int ymargin,
1311                        int test_pattern,
1312                        bool flip,
1313                        bool use_mrt,
1314                        content::GLHelper::ScalerQuality quality) {
1315     WebGLId src_texture = context_->createTexture();
1316     SkBitmap input_pixels;
1317     input_pixels.allocN32Pixels(xsize, ysize);
1318
1319     for (int x = 0; x < xsize; ++x) {
1320       for (int y = 0; y < ysize; ++y) {
1321         switch (test_pattern) {
1322           case 0:  // Smooth test pattern
1323             SetChannel(&input_pixels, x, y, 0, x * 10);
1324             SetChannel(&input_pixels, x, y, 1, y * 10);
1325             SetChannel(&input_pixels, x, y, 2, (x + y) * 10);
1326             SetChannel(&input_pixels, x, y, 3, 255);
1327             break;
1328           case 1:  // Small blocks
1329             SetChannel(&input_pixels, x, y, 0, x & 1 ? 255 : 0);
1330             SetChannel(&input_pixels, x, y, 1, y & 1 ? 255 : 0);
1331             SetChannel(&input_pixels, x, y, 2, (x + y) & 1 ? 255 : 0);
1332             SetChannel(&input_pixels, x, y, 3, 255);
1333             break;
1334           case 2:  // Medium blocks
1335             SetChannel(&input_pixels, x, y, 0, 10 + x / 2 * 50);
1336             SetChannel(&input_pixels, x, y, 1, 10 + y / 3 * 50);
1337             SetChannel(&input_pixels, x, y, 2, (x + y) / 5 * 50 + 5);
1338             SetChannel(&input_pixels, x, y, 3, 255);
1339             break;
1340         }
1341       }
1342     }
1343
1344     context_->bindTexture(GL_TEXTURE_2D, src_texture);
1345     context_->texImage2D(GL_TEXTURE_2D,
1346                          0,
1347                          GL_RGBA,
1348                          xsize,
1349                          ysize,
1350                          0,
1351                          GL_RGBA,
1352                          GL_UNSIGNED_BYTE,
1353                          input_pixels.getPixels());
1354
1355     gpu::Mailbox mailbox;
1356     context_->genMailboxCHROMIUM(mailbox.name);
1357     EXPECT_FALSE(mailbox.IsZero());
1358     context_->produceTextureCHROMIUM(GL_TEXTURE_2D, mailbox.name);
1359     uint32 sync_point = context_->insertSyncPoint();
1360
1361     std::string message = base::StringPrintf(
1362         "input size: %dx%d "
1363         "output size: %dx%d "
1364         "margin: %dx%d "
1365         "pattern: %d %s %s",
1366         xsize,
1367         ysize,
1368         output_xsize,
1369         output_ysize,
1370         xmargin,
1371         ymargin,
1372         test_pattern,
1373         flip ? "flip" : "noflip",
1374         flip ? "mrt" : "nomrt");
1375     scoped_ptr<ReadbackYUVInterface> yuv_reader(
1376         helper_->CreateReadbackPipelineYUV(
1377             quality,
1378             gfx::Size(xsize, ysize),
1379             gfx::Rect(0, 0, xsize, ysize),
1380             gfx::Size(output_xsize, output_ysize),
1381             gfx::Rect(xmargin, ymargin, xsize, ysize),
1382             flip,
1383             use_mrt));
1384
1385     scoped_refptr<media::VideoFrame> output_frame =
1386         media::VideoFrame::CreateFrame(
1387             media::VideoFrame::YV12,
1388             gfx::Size(output_xsize, output_ysize),
1389             gfx::Rect(0, 0, output_xsize, output_ysize),
1390             gfx::Size(output_xsize, output_ysize),
1391             base::TimeDelta::FromSeconds(0));
1392     scoped_refptr<media::VideoFrame> truth_frame =
1393         media::VideoFrame::CreateFrame(
1394             media::VideoFrame::YV12,
1395             gfx::Size(output_xsize, output_ysize),
1396             gfx::Rect(0, 0, output_xsize, output_ysize),
1397             gfx::Size(output_xsize, output_ysize),
1398             base::TimeDelta::FromSeconds(0));
1399
1400     base::RunLoop run_loop;
1401     yuv_reader->ReadbackYUV(mailbox,
1402                             sync_point,
1403                             output_frame.get(),
1404                             base::Bind(&callcallback, run_loop.QuitClosure()));
1405     run_loop.Run();
1406
1407     if (flip) {
1408       FlipSKBitmap(&input_pixels);
1409     }
1410
1411     unsigned char* Y = truth_frame->data(media::VideoFrame::kYPlane);
1412     unsigned char* U = truth_frame->data(media::VideoFrame::kUPlane);
1413     unsigned char* V = truth_frame->data(media::VideoFrame::kVPlane);
1414     int32 y_stride = truth_frame->stride(media::VideoFrame::kYPlane);
1415     int32 u_stride = truth_frame->stride(media::VideoFrame::kUPlane);
1416     int32 v_stride = truth_frame->stride(media::VideoFrame::kVPlane);
1417     memset(Y, 0x00, y_stride * output_ysize);
1418     memset(U, 0x80, u_stride * output_ysize / 2);
1419     memset(V, 0x80, v_stride * output_ysize / 2);
1420
1421     const float kRGBtoYColorWeights[] = {0.257f, 0.504f, 0.098f, 0.0625f};
1422     const float kRGBtoUColorWeights[] = {-0.148f, -0.291f, 0.439f, 0.5f};
1423     const float kRGBtoVColorWeights[] = {0.439f, -0.368f, -0.071f, 0.5f};
1424
1425     for (int y = 0; y < ysize; y++) {
1426       for (int x = 0; x < xsize; x++) {
1427         Y[(y + ymargin) * y_stride + x + xmargin] = float_to_byte(
1428             ChannelAsFloat(&input_pixels, x, y, 0) * kRGBtoYColorWeights[0] +
1429             ChannelAsFloat(&input_pixels, x, y, 1) * kRGBtoYColorWeights[1] +
1430             ChannelAsFloat(&input_pixels, x, y, 2) * kRGBtoYColorWeights[2] +
1431             kRGBtoYColorWeights[3]);
1432       }
1433     }
1434
1435     for (int y = 0; y < ysize / 2; y++) {
1436       for (int x = 0; x < xsize / 2; x++) {
1437         U[(y + ymargin / 2) * u_stride + x + xmargin / 2] =
1438             float_to_byte(Bilinear(&input_pixels, x * 2 + 1.0, y * 2 + 1.0, 0) *
1439                               kRGBtoUColorWeights[0] +
1440                           Bilinear(&input_pixels, x * 2 + 1.0, y * 2 + 1.0, 1) *
1441                               kRGBtoUColorWeights[1] +
1442                           Bilinear(&input_pixels, x * 2 + 1.0, y * 2 + 1.0, 2) *
1443                               kRGBtoUColorWeights[2] +
1444                           kRGBtoUColorWeights[3]);
1445         V[(y + ymargin / 2) * v_stride + x + xmargin / 2] =
1446             float_to_byte(Bilinear(&input_pixels, x * 2 + 1.0, y * 2 + 1.0, 0) *
1447                               kRGBtoVColorWeights[0] +
1448                           Bilinear(&input_pixels, x * 2 + 1.0, y * 2 + 1.0, 1) *
1449                               kRGBtoVColorWeights[1] +
1450                           Bilinear(&input_pixels, x * 2 + 1.0, y * 2 + 1.0, 2) *
1451                               kRGBtoVColorWeights[2] +
1452                           kRGBtoVColorWeights[3]);
1453       }
1454     }
1455
1456     ComparePlane(Y,
1457                  output_frame->data(media::VideoFrame::kYPlane),
1458                  2,
1459                  output_xsize,
1460                  y_stride,
1461                  output_ysize,
1462                  &input_pixels,
1463                  message + " Y plane");
1464     ComparePlane(U,
1465                  output_frame->data(media::VideoFrame::kUPlane),
1466                  2,
1467                  output_xsize / 2,
1468                  u_stride,
1469                  output_ysize / 2,
1470                  &input_pixels,
1471                  message + " U plane");
1472     ComparePlane(V,
1473                  output_frame->data(media::VideoFrame::kVPlane),
1474                  2,
1475                  output_xsize / 2,
1476                  v_stride,
1477                  output_ysize / 2,
1478                  &input_pixels,
1479                  message + " V plane");
1480
1481     context_->deleteTexture(src_texture);
1482   }
1483
1484   void TestAddOps(int src, int dst, bool scale_x, bool allow3) {
1485     std::deque<GLHelperScaling::ScaleOp> ops;
1486     GLHelperScaling::ScaleOp::AddOps(src, dst, scale_x, allow3, &ops);
1487     // Scale factor 3 is a special case.
1488     // It is currently only allowed by itself.
1489     if (allow3 && dst * 3 >= src && dst * 2 < src) {
1490       EXPECT_EQ(ops[0].scale_factor, 3);
1491       EXPECT_EQ(ops.size(), 1U);
1492       EXPECT_EQ(ops[0].scale_x, scale_x);
1493       EXPECT_EQ(ops[0].scale_size, dst);
1494       return;
1495     }
1496
1497     for (size_t i = 0; i < ops.size(); i++) {
1498       EXPECT_EQ(ops[i].scale_x, scale_x);
1499       if (i == 0) {
1500         // Only the first op is allowed to be a scale up.
1501         // (Scaling up *after* scaling down would make it fuzzy.)
1502         EXPECT_TRUE(ops[0].scale_factor == 0 || ops[0].scale_factor == 2);
1503       } else {
1504         // All other operations must be 50% downscales.
1505         EXPECT_EQ(ops[i].scale_factor, 2);
1506       }
1507     }
1508     // Check that the scale factors make sense and add up.
1509     int tmp = dst;
1510     for (int i = static_cast<int>(ops.size() - 1); i >= 0; i--) {
1511       EXPECT_EQ(tmp, ops[i].scale_size);
1512       if (ops[i].scale_factor == 0) {
1513         EXPECT_EQ(i, 0);
1514         EXPECT_GT(tmp, src);
1515         tmp = src;
1516       } else {
1517         tmp *= ops[i].scale_factor;
1518       }
1519     }
1520     EXPECT_EQ(tmp, src);
1521   }
1522
1523   void CheckPipeline2(int xsize,
1524                       int ysize,
1525                       int dst_xsize,
1526                       int dst_ysize,
1527                       const std::string& description) {
1528     std::vector<GLHelperScaling::ScalerStage> stages;
1529     helper_scaling_->ConvertScalerOpsToScalerStages(
1530         content::GLHelper::SCALER_QUALITY_GOOD,
1531         gfx::Size(xsize, ysize),
1532         gfx::Rect(0, 0, xsize, ysize),
1533         gfx::Size(dst_xsize, dst_ysize),
1534         false,
1535         false,
1536         &x_ops_,
1537         &y_ops_,
1538         &stages);
1539     EXPECT_EQ(x_ops_.size(), 0U);
1540     EXPECT_EQ(y_ops_.size(), 0U);
1541     ValidateScalerStages(content::GLHelper::SCALER_QUALITY_GOOD,
1542                          stages,
1543                          gfx::Size(dst_xsize, dst_ysize),
1544                          "");
1545     EXPECT_EQ(PrintStages(stages), description);
1546   }
1547
1548   void CheckOptimizationsTest() {
1549     // Basic upscale. X and Y should be combined into one pass.
1550     x_ops_.push_back(GLHelperScaling::ScaleOp(0, true, 2000));
1551     y_ops_.push_back(GLHelperScaling::ScaleOp(0, false, 2000));
1552     CheckPipeline2(1024, 768, 2000, 2000, "1024x768 -> 2000x2000 bilinear\n");
1553
1554     // X scaled 1/2, Y upscaled, should still be one pass.
1555     x_ops_.push_back(GLHelperScaling::ScaleOp(2, true, 512));
1556     y_ops_.push_back(GLHelperScaling::ScaleOp(0, false, 2000));
1557     CheckPipeline2(1024, 768, 512, 2000, "1024x768 -> 512x2000 bilinear\n");
1558
1559     // X upscaled, Y scaled 1/2, one bilinear pass
1560     x_ops_.push_back(GLHelperScaling::ScaleOp(0, true, 2000));
1561     y_ops_.push_back(GLHelperScaling::ScaleOp(2, false, 384));
1562     CheckPipeline2(1024, 768, 2000, 384, "1024x768 -> 2000x384 bilinear\n");
1563
1564     // X scaled 1/2, Y scaled 1/2, one bilinear pass
1565     x_ops_.push_back(GLHelperScaling::ScaleOp(2, true, 512));
1566     y_ops_.push_back(GLHelperScaling::ScaleOp(2, false, 384));
1567     CheckPipeline2(1024, 768, 512, 384, "1024x768 -> 512x384 bilinear\n");
1568
1569     // X scaled 1/2, Y scaled to 60%, one bilinear2 pass.
1570     x_ops_.push_back(GLHelperScaling::ScaleOp(2, true, 50));
1571     y_ops_.push_back(GLHelperScaling::ScaleOp(0, false, 120));
1572     y_ops_.push_back(GLHelperScaling::ScaleOp(2, false, 60));
1573     CheckPipeline2(100, 100, 50, 60, "100x100 -> 50x60 bilinear2 Y\n");
1574
1575     // X scaled to 60%, Y scaled 1/2, one bilinear2 pass.
1576     x_ops_.push_back(GLHelperScaling::ScaleOp(0, true, 120));
1577     x_ops_.push_back(GLHelperScaling::ScaleOp(2, true, 60));
1578     y_ops_.push_back(GLHelperScaling::ScaleOp(2, false, 50));
1579     CheckPipeline2(100, 100, 60, 50, "100x100 -> 60x50 bilinear2 X\n");
1580
1581     // X scaled to 60%, Y scaled 60%, one bilinear2x2 pass.
1582     x_ops_.push_back(GLHelperScaling::ScaleOp(0, true, 120));
1583     x_ops_.push_back(GLHelperScaling::ScaleOp(2, true, 60));
1584     y_ops_.push_back(GLHelperScaling::ScaleOp(0, false, 120));
1585     y_ops_.push_back(GLHelperScaling::ScaleOp(2, false, 60));
1586     CheckPipeline2(100, 100, 60, 60, "100x100 -> 60x60 bilinear2x2\n");
1587
1588     // X scaled to 40%, Y scaled 40%, two bilinear3 passes.
1589     x_ops_.push_back(GLHelperScaling::ScaleOp(3, true, 40));
1590     y_ops_.push_back(GLHelperScaling::ScaleOp(3, false, 40));
1591     CheckPipeline2(100,
1592                    100,
1593                    40,
1594                    40,
1595                    "100x100 -> 100x40 bilinear3 Y\n"
1596                    "100x40 -> 40x40 bilinear3 X\n");
1597
1598     // X scaled to 60%, Y scaled 40%
1599     x_ops_.push_back(GLHelperScaling::ScaleOp(0, true, 120));
1600     x_ops_.push_back(GLHelperScaling::ScaleOp(2, true, 60));
1601     y_ops_.push_back(GLHelperScaling::ScaleOp(3, false, 40));
1602     CheckPipeline2(100,
1603                    100,
1604                    60,
1605                    40,
1606                    "100x100 -> 100x40 bilinear3 Y\n"
1607                    "100x40 -> 60x40 bilinear2 X\n");
1608
1609     // X scaled to 40%, Y scaled 60%
1610     x_ops_.push_back(GLHelperScaling::ScaleOp(3, true, 40));
1611     y_ops_.push_back(GLHelperScaling::ScaleOp(0, false, 120));
1612     y_ops_.push_back(GLHelperScaling::ScaleOp(2, false, 60));
1613     CheckPipeline2(100,
1614                    100,
1615                    40,
1616                    60,
1617                    "100x100 -> 100x60 bilinear2 Y\n"
1618                    "100x60 -> 40x60 bilinear3 X\n");
1619
1620     // X scaled to 30%, Y scaled 30%
1621     x_ops_.push_back(GLHelperScaling::ScaleOp(0, true, 120));
1622     x_ops_.push_back(GLHelperScaling::ScaleOp(2, true, 60));
1623     x_ops_.push_back(GLHelperScaling::ScaleOp(2, true, 30));
1624     y_ops_.push_back(GLHelperScaling::ScaleOp(0, false, 120));
1625     y_ops_.push_back(GLHelperScaling::ScaleOp(2, false, 60));
1626     y_ops_.push_back(GLHelperScaling::ScaleOp(2, false, 30));
1627     CheckPipeline2(100,
1628                    100,
1629                    30,
1630                    30,
1631                    "100x100 -> 100x30 bilinear4 Y\n"
1632                    "100x30 -> 30x30 bilinear4 X\n");
1633
1634     // X scaled to 50%, Y scaled 30%
1635     x_ops_.push_back(GLHelperScaling::ScaleOp(2, true, 50));
1636     y_ops_.push_back(GLHelperScaling::ScaleOp(0, false, 120));
1637     y_ops_.push_back(GLHelperScaling::ScaleOp(2, false, 60));
1638     y_ops_.push_back(GLHelperScaling::ScaleOp(2, false, 30));
1639     CheckPipeline2(100, 100, 50, 30, "100x100 -> 50x30 bilinear4 Y\n");
1640
1641     // X scaled to 150%, Y scaled 30%
1642     // Note that we avoid combinding X and Y passes
1643     // as that would probably be LESS efficient here.
1644     x_ops_.push_back(GLHelperScaling::ScaleOp(0, true, 150));
1645     y_ops_.push_back(GLHelperScaling::ScaleOp(0, false, 120));
1646     y_ops_.push_back(GLHelperScaling::ScaleOp(2, false, 60));
1647     y_ops_.push_back(GLHelperScaling::ScaleOp(2, false, 30));
1648     CheckPipeline2(100,
1649                    100,
1650                    150,
1651                    30,
1652                    "100x100 -> 100x30 bilinear4 Y\n"
1653                    "100x30 -> 150x30 bilinear\n");
1654
1655     // X scaled to 1%, Y scaled 1%
1656     x_ops_.push_back(GLHelperScaling::ScaleOp(0, true, 128));
1657     x_ops_.push_back(GLHelperScaling::ScaleOp(2, true, 64));
1658     x_ops_.push_back(GLHelperScaling::ScaleOp(2, true, 32));
1659     x_ops_.push_back(GLHelperScaling::ScaleOp(2, true, 16));
1660     x_ops_.push_back(GLHelperScaling::ScaleOp(2, true, 8));
1661     x_ops_.push_back(GLHelperScaling::ScaleOp(2, true, 4));
1662     x_ops_.push_back(GLHelperScaling::ScaleOp(2, true, 2));
1663     x_ops_.push_back(GLHelperScaling::ScaleOp(2, true, 1));
1664     y_ops_.push_back(GLHelperScaling::ScaleOp(0, false, 128));
1665     y_ops_.push_back(GLHelperScaling::ScaleOp(2, false, 64));
1666     y_ops_.push_back(GLHelperScaling::ScaleOp(2, false, 32));
1667     y_ops_.push_back(GLHelperScaling::ScaleOp(2, false, 16));
1668     y_ops_.push_back(GLHelperScaling::ScaleOp(2, false, 8));
1669     y_ops_.push_back(GLHelperScaling::ScaleOp(2, false, 4));
1670     y_ops_.push_back(GLHelperScaling::ScaleOp(2, false, 2));
1671     y_ops_.push_back(GLHelperScaling::ScaleOp(2, false, 1));
1672     CheckPipeline2(100,
1673                    100,
1674                    1,
1675                    1,
1676                    "100x100 -> 100x32 bilinear4 Y\n"
1677                    "100x32 -> 100x4 bilinear4 Y\n"
1678                    "100x4 -> 64x1 bilinear2x2\n"
1679                    "64x1 -> 8x1 bilinear4 X\n"
1680                    "8x1 -> 1x1 bilinear4 X\n");
1681   }
1682
1683   scoped_ptr<WebGraphicsContext3DInProcessCommandBufferImpl> context_;
1684   gpu::ContextSupport* context_support_;
1685   scoped_ptr<content::GLHelper> helper_;
1686   scoped_ptr<content::GLHelperScaling> helper_scaling_;
1687   std::deque<GLHelperScaling::ScaleOp> x_ops_, y_ops_;
1688 };
1689
1690 class GLHelperPixelTest : public GLHelperTest {
1691  private:
1692   gfx::DisableNullDrawGLBindings enable_pixel_output_;
1693 };
1694
1695 TEST_F(GLHelperTest, RGBASyncReadbackTest) {
1696   const int kTestSize = 64;
1697   bool result = TestTextureFormatReadback(gfx::Size(kTestSize,kTestSize),
1698                                           kRGBA_8888_SkColorType,
1699                                           false);
1700   EXPECT_EQ(result, true);
1701 }
1702
1703
1704 TEST_F(GLHelperTest, BGRASyncReadbackTest) {
1705   const int kTestSize = 64;
1706   bool result = TestTextureFormatReadback(gfx::Size(kTestSize,kTestSize),
1707                                           kBGRA_8888_SkColorType,
1708                                           false);
1709   EXPECT_EQ(result, true);
1710 }
1711
1712 TEST_F(GLHelperTest, RGB565SyncReadbackTest) {
1713   const int kTestSize = 64;
1714   bool result = TestTextureFormatReadback(gfx::Size(kTestSize,kTestSize),
1715                                           kRGB_565_SkColorType,
1716                                           false);
1717   EXPECT_EQ(result, true);
1718 }
1719
1720 TEST_F(GLHelperTest, RGBAASyncReadbackTest) {
1721   const int kTestSize = 64;
1722   bool result = TestTextureFormatReadback(gfx::Size(kTestSize,kTestSize),
1723                                           kRGBA_8888_SkColorType,
1724                                           true);
1725   EXPECT_EQ(result, true);
1726 }
1727
1728 TEST_F(GLHelperTest, BGRAASyncReadbackTest) {
1729   const int kTestSize = 64;
1730   bool result = TestTextureFormatReadback(gfx::Size(kTestSize,kTestSize),
1731                                           kBGRA_8888_SkColorType,
1732                                           true);
1733   EXPECT_EQ(result, true);
1734 }
1735
1736 TEST_F(GLHelperTest, RGB565ASyncReadbackTest) {
1737   const int kTestSize = 64;
1738   bool result = TestTextureFormatReadback(gfx::Size(kTestSize,kTestSize),
1739                                           kRGB_565_SkColorType,
1740                                           true);
1741   EXPECT_EQ(result, true);
1742 }
1743
1744 TEST_F(GLHelperPixelTest, YUVReadbackOptTest) {
1745   // This test uses the cb_command tracing events to detect how many
1746   // scaling passes are actually performed by the YUV readback pipeline.
1747   StartTracing(TRACE_DISABLED_BY_DEFAULT("cb_command"));
1748
1749   TestYUVReadback(800,
1750                   400,
1751                   800,
1752                   400,
1753                   0,
1754                   0,
1755                   1,
1756                   false,
1757                   true,
1758                   content::GLHelper::SCALER_QUALITY_FAST);
1759
1760   std::map<std::string, int> event_counts;
1761   EndTracing(&event_counts);
1762   int draw_buffer_calls = event_counts["kDrawBuffersEXTImmediate"];
1763   int draw_arrays_calls = event_counts["kDrawArrays"];
1764   VLOG(1) << "Draw buffer calls: " << draw_buffer_calls;
1765   VLOG(1) << "DrawArrays calls: " << draw_arrays_calls;
1766
1767   if (draw_buffer_calls) {
1768     // When using MRT, the YUV readback code should only
1769     // execute two draw arrays, and scaling should be integrated
1770     // into those two calls since we are using the FAST scalign
1771     // quality.
1772     EXPECT_EQ(2, draw_arrays_calls);
1773   } else {
1774     // When not using MRT, there are three passes for the YUV,
1775     // and one for the scaling.
1776     EXPECT_EQ(4, draw_arrays_calls);
1777   }
1778 }
1779
1780 TEST_F(GLHelperPixelTest, YUVReadbackTest) {
1781   int sizes[] = {2, 4, 14};
1782   for (int flip = 0; flip <= 1; flip++) {
1783     for (int use_mrt = 0; use_mrt <= 1; use_mrt++) {
1784       for (unsigned int x = 0; x < arraysize(sizes); x++) {
1785         for (unsigned int y = 0; y < arraysize(sizes); y++) {
1786           for (unsigned int ox = x; ox < arraysize(sizes); ox++) {
1787             for (unsigned int oy = y; oy < arraysize(sizes); oy++) {
1788               // If output is a subsection of the destination frame, (letterbox)
1789               // then try different variations of where the subsection goes.
1790               for (Margin xm = x < ox ? MarginLeft : MarginRight;
1791                    xm <= MarginRight;
1792                    xm = NextMargin(xm)) {
1793                 for (Margin ym = y < oy ? MarginLeft : MarginRight;
1794                      ym <= MarginRight;
1795                      ym = NextMargin(ym)) {
1796                   for (int pattern = 0; pattern < 3; pattern++) {
1797                     TestYUVReadback(sizes[x],
1798                                     sizes[y],
1799                                     sizes[ox],
1800                                     sizes[oy],
1801                                     compute_margin(sizes[x], sizes[ox], xm),
1802                                     compute_margin(sizes[y], sizes[oy], ym),
1803                                     pattern,
1804                                     flip == 1,
1805                                     use_mrt == 1,
1806                                     content::GLHelper::SCALER_QUALITY_GOOD);
1807                     if (HasFailure()) {
1808                       return;
1809                     }
1810                   }
1811                 }
1812               }
1813             }
1814           }
1815         }
1816       }
1817     }
1818   }
1819 }
1820
1821 // Per pixel tests, all sizes are small so that we can print
1822 // out the generated bitmaps.
1823 TEST_F(GLHelperPixelTest, ScaleTest) {
1824   int sizes[] = {3, 6, 16};
1825   for (int flip = 0; flip <= 1; flip++) {
1826     for (size_t q_index = 0; q_index < arraysize(kQualities); q_index++) {
1827       for (int x = 0; x < 3; x++) {
1828         for (int y = 0; y < 3; y++) {
1829           for (int dst_x = 0; dst_x < 3; dst_x++) {
1830             for (int dst_y = 0; dst_y < 3; dst_y++) {
1831               for (int pattern = 0; pattern < 3; pattern++) {
1832                 TestScale(sizes[x],
1833                           sizes[y],
1834                           sizes[dst_x],
1835                           sizes[dst_y],
1836                           pattern,
1837                           q_index,
1838                           flip == 1);
1839                 if (HasFailure()) {
1840                   return;
1841                 }
1842               }
1843             }
1844           }
1845         }
1846       }
1847     }
1848   }
1849 }
1850
1851 // Per pixel tests, all sizes are small so that we can print
1852 // out the generated bitmaps.
1853 TEST_F(GLHelperPixelTest, CropScaleReadbackAndCleanTextureTest) {
1854   const int kSizes[] = {3, 6, 16};
1855   const SkColorType kColorTypes[] = {
1856       kAlpha_8_SkColorType, kRGBA_8888_SkColorType, kBGRA_8888_SkColorType};
1857   for (size_t color_type = 0; color_type < arraysize(kColorTypes);
1858        color_type++) {
1859     // Test BEST and FAST qualities, skip GOOD
1860     for (size_t q_index = 0; q_index < arraysize(kQualities); q_index += 2) {
1861       for (size_t x = 0; x < arraysize(kSizes); x++) {
1862         for (size_t y = 0; y < arraysize(kSizes); y++) {
1863           for (size_t dst_x = 0; dst_x < arraysize(kSizes); dst_x++) {
1864             for (size_t dst_y = 0; dst_y < arraysize(kSizes); dst_y++) {
1865               for (int pattern = 0; pattern < 3; pattern++) {
1866                 TestCropScaleReadbackAndCleanTexture(kSizes[x],
1867                                                      kSizes[y],
1868                                                      kSizes[dst_x],
1869                                                      kSizes[dst_y],
1870                                                      pattern,
1871                                                      kColorTypes[color_type],
1872                                                      false,
1873                                                      q_index);
1874                 if (HasFailure())
1875                   return;
1876               }
1877             }
1878           }
1879         }
1880       }
1881     }
1882   }
1883 }
1884
1885 // Validate that all scaling generates valid pipelines.
1886 TEST_F(GLHelperTest, ValidateScalerPipelines) {
1887   int sizes[] = {7, 99, 128, 256, 512, 719, 720, 721, 1920, 2011, 3217, 4096};
1888   for (size_t q = 0; q < arraysize(kQualities); q++) {
1889     for (size_t x = 0; x < arraysize(sizes); x++) {
1890       for (size_t y = 0; y < arraysize(sizes); y++) {
1891         for (size_t dst_x = 0; dst_x < arraysize(sizes); dst_x++) {
1892           for (size_t dst_y = 0; dst_y < arraysize(sizes); dst_y++) {
1893             TestScalerPipeline(
1894                 q, sizes[x], sizes[y], sizes[dst_x], sizes[dst_y]);
1895             if (HasFailure()) {
1896               return;
1897             }
1898           }
1899         }
1900       }
1901     }
1902   }
1903 }
1904
1905 // Make sure we don't create overly complicated pipelines
1906 // for a few common use cases.
1907 TEST_F(GLHelperTest, CheckSpecificPipelines) {
1908   // Upscale should be single pass.
1909   CheckPipeline(content::GLHelper::SCALER_QUALITY_GOOD,
1910                 1024,
1911                 700,
1912                 1280,
1913                 720,
1914                 "1024x700 -> 1280x720 bilinear\n");
1915   // Slight downscale should use BILINEAR2X2.
1916   CheckPipeline(content::GLHelper::SCALER_QUALITY_GOOD,
1917                 1280,
1918                 720,
1919                 1024,
1920                 700,
1921                 "1280x720 -> 1024x700 bilinear2x2\n");
1922   // Most common tab capture pipeline on the Pixel.
1923   // Should be using two BILINEAR3 passes.
1924   CheckPipeline(content::GLHelper::SCALER_QUALITY_GOOD,
1925                 2560,
1926                 1476,
1927                 1249,
1928                 720,
1929                 "2560x1476 -> 2560x720 bilinear3 Y\n"
1930                 "2560x720 -> 1249x720 bilinear3 X\n");
1931 }
1932
1933 TEST_F(GLHelperTest, ScalerOpTest) {
1934   for (int allow3 = 0; allow3 <= 1; allow3++) {
1935     for (int dst = 1; dst < 2049; dst += 1 + (dst >> 3)) {
1936       for (int src = 1; src < 2049; src++) {
1937         TestAddOps(src, dst, allow3 == 1, (src & 1) == 1);
1938         if (HasFailure()) {
1939           LOG(ERROR) << "Failed for src=" << src << " dst=" << dst
1940                      << " allow3=" << allow3;
1941           return;
1942         }
1943       }
1944     }
1945   }
1946 }
1947
1948 TEST_F(GLHelperTest, CheckOptimizations) {
1949   // Test in baseclass since it is friends with GLHelperScaling
1950   CheckOptimizationsTest();
1951 }
1952
1953 }  // namespace
1954
1955 // These tests needs to run against a proper GL environment, so we
1956 // need to set it up before we can run the tests.
1957 int main(int argc, char** argv) {
1958   base::CommandLine::Init(argc, argv);
1959   base::TestSuite* suite = new content::ContentTestSuite(argc, argv);
1960 #if defined(OS_MACOSX)
1961   base::mac::ScopedNSAutoreleasePool pool;
1962 #endif
1963
1964   content::UnitTestTestSuite runner(suite);
1965   base::MessageLoop message_loop;
1966   return runner.Run();
1967 }