submodule/skia/gm/runtimeimagefilter.cpp

   1 /*
   2  * Copyright 2012 Google Inc.
   3  *
   4  * Use of this source code is governed by a BSD-style license that can be
   5  * found in the LICENSE file.
   6  */
   7
   8 #include "gm/gm.h"
   9 #include "include/core/SkCanvas.h"
  10 #include "include/core/SkColor.h"
  11 #include "include/core/SkFont.h"
  12 #include "include/core/SkImageFilter.h"
  13 #include "include/core/SkImageInfo.h"
  14 #include "include/core/SkPaint.h"
  15 #include "include/core/SkPixelRef.h"
  16 #include "include/core/SkRect.h"
  17 #include "include/core/SkRefCnt.h"
  18 #include "include/core/SkScalar.h"
  19 #include "include/effects/SkImageFilters.h"
  20 #include "include/effects/SkRuntimeEffect.h"
  21 #include "include/utils/SkRandom.h"
  22 #include "src/effects/imagefilters/SkRuntimeImageFilter.h"
  23 #include "tools/Resources.h"
  24 #include "tools/ToolUtils.h"
  25
  26 static sk_sp<SkImageFilter> make_filter() {
  27     sk_sp<SkRuntimeEffect> effect = SkRuntimeEffect::MakeForShader(SkString(R"(
  28         uniform shader child;
  29         half4 main(float2 coord) {
  30             coord.x += sin(coord.y / 3) * 4;
  31             return child.eval(coord);
  32         }
  33     )")).effect;
  34     SkRuntimeShaderBuilder builder(std::move(effect));
  35     return SkImageFilters::RuntimeShader(builder, /*childShaderName=*/nullptr, /*input=*/nullptr);
  36 }
  37
  38 DEF_SIMPLE_GM_BG(rtif_distort, canvas, 500, 750, SK_ColorBLACK) {
  39     SkRect clip = SkRect::MakeWH(250, 250);
  40     SkPaint filterPaint;
  41     filterPaint.setImageFilter(make_filter());
  42
  43     auto draw_layer = [&](SkScalar tx, SkScalar ty, SkMatrix m) {
  44         canvas->save();
  45         canvas->translate(tx, ty);
  46         canvas->clipRect(clip);
  47         canvas->concat(m);
  48         canvas->saveLayer(nullptr, &filterPaint);
  49         const char* str = "The quick brown fox jumped over the lazy dog.";
  50         SkRandom rand;
  51         SkFont font(ToolUtils::create_portable_typeface());
  52         for (int i = 0; i < 25; ++i) {
  53             int x = rand.nextULessThan(500);
  54             int y = rand.nextULessThan(500);
  55             SkPaint paint;
  56             paint.setColor(ToolUtils::color_to_565(rand.nextBits(24) | 0xFF000000));
  57             font.setSize(rand.nextRangeScalar(0, 300));
  58             canvas->drawString(str, SkIntToScalar(x), SkIntToScalar(y), font, paint);
  59         }
  60         canvas->restore();
  61         canvas->restore();
  62     };
  63
  64     draw_layer(  0,   0, SkMatrix::I());
  65     draw_layer(250,   0, SkMatrix::Scale(0.5f, 0.5f));
  66     draw_layer(  0, 250, SkMatrix::RotateDeg(45, {125, 125}));
  67     draw_layer(250, 250, SkMatrix::Scale(0.5f, 0.5f) * SkMatrix::RotateDeg(45, {125, 125}));
  68     draw_layer(  0, 500, SkMatrix::Skew(-0.5f, 0));
  69     SkMatrix p = SkMatrix::I();
  70     p.setPerspX(0.0015f);
  71     p.setPerspY(-0.0015f);
  72     draw_layer(250, 500, p);
  73 }
  74
  75 DEF_SIMPLE_GM(rtif_unsharp, canvas, 512, 256) {
  76     // Similar to "unsharp_rt", which does the entire unsharp filter in a single shader. This uses
  77     // the image filter DAG to compute the blurred version, then does the weighted subtraction.
  78     sk_sp<SkRuntimeEffect> effect = SkRuntimeEffect::MakeForShader(SkString(R"(
  79         uniform shader content;
  80         uniform shader blurred;
  81         vec4 main(vec2 coord) {
  82             vec4 c = content.eval(coord);
  83             vec4 b = blurred.eval(coord);
  84             return c + (c - b) * 4;
  85         }
  86     )")).effect;
  87     SkRuntimeShaderBuilder builder(std::move(effect));
  88
  89     auto image = GetResourceAsImage("images/mandrill_256.png");
  90     auto blurredSrc = SkImageFilters::Blur(1, 1, /*input=*/nullptr);
  91
  92     const char* childNames[] = { "content", "blurred" };
  93     sk_sp<SkImageFilter> childNodes[] = { nullptr, blurredSrc };
  94
  95     auto sharpened = SkImageFilters::RuntimeShader(builder, childNames, childNodes, 2);
  96
  97     canvas->drawImage(image, 0, 0);
  98     canvas->translate(256, 0);
  99
 100     SkPaint paint;
 101     paint.setImageFilter(sharpened);
 102     canvas->saveLayer({ 0, 0, 256, 256 }, &paint);
 103     canvas->drawImage(image, 0, 0);
 104     canvas->restore();
 105 }