submodule/skia/gm/bmpfilterqualityrepeat.cpp

   1 /*
   2  * Copyright 2015 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/SkBitmap.h"
  10 #include "include/core/SkCanvas.h"
  11 #include "include/core/SkFont.h"
  12 #include "include/core/SkMatrix.h"
  13 #include "include/core/SkPaint.h"
  14 #include "include/core/SkRect.h"
  15 #include "include/core/SkScalar.h"
  16 #include "include/core/SkShader.h"
  17 #include "include/core/SkSize.h"
  18 #include "include/core/SkString.h"
  19 #include "include/core/SkTileMode.h"
  20 #include "include/core/SkTypeface.h"
  21 #include "include/core/SkTypes.h"
  22 #include "tools/ToolUtils.h"
  23
  24 // Inspired by svg/as-border-image/svg-as-border-image.html. Draws a four-color checker board bitmap
  25 // such that it is stretched and repeat tiled with different filter qualities. It is testing whether
  26 // the bmp filter respects the repeat mode at the tile seams.
  27 class BmpFilterQualityRepeat : public skiagm::GM {
  28 public:
  29     BmpFilterQualityRepeat() { this->setBGColor(ToolUtils::color_to_565(0xFFCCBBAA)); }
  30
  31 protected:
  32
  33     void onOnceBeforeDraw() override {
  34         fBmp.allocN32Pixels(40, 40, true);
  35         SkCanvas canvas(fBmp);
  36         SkBitmap colorBmp;
  37         colorBmp.allocN32Pixels(20, 20, true);
  38         colorBmp.eraseColor(0xFFFF0000);
  39         canvas.drawImage(colorBmp.asImage(), 0, 0);
  40         colorBmp.eraseColor(ToolUtils::color_to_565(0xFF008200));
  41         canvas.drawImage(colorBmp.asImage(), 20, 0);
  42         colorBmp.eraseColor(ToolUtils::color_to_565(0xFFFF9000));
  43         canvas.drawImage(colorBmp.asImage(), 0, 20);
  44         colorBmp.eraseColor(ToolUtils::color_to_565(0xFF2000FF));
  45         canvas.drawImage(colorBmp.asImage(), 20, 20);
  46     }
  47
  48     SkString onShortName() override { return SkString("bmp_filter_quality_repeat"); }
  49
  50     SkISize onISize() override { return SkISize::Make(1000, 400); }
  51
  52     void onDraw(SkCanvas* canvas) override {
  53         this->drawAll(canvas, 2.5f);
  54         canvas->translate(0, 250);
  55         canvas->scale(0.5, 0.5);
  56         this->drawAll(canvas, 1);
  57     }
  58
  59 private:
  60     void drawAll(SkCanvas* canvas, SkScalar scaleX) const {
  61         SkRect rect = SkRect::MakeLTRB(20, 60, 220, 210);
  62         SkMatrix lm = SkMatrix::I();
  63         lm.setScaleX(scaleX);
  64         lm.setTranslateX(423);
  65         lm.setTranslateY(330);
  66
  67         SkPaint textPaint;
  68         textPaint.setAntiAlias(true);
  69
  70         SkPaint bmpPaint(textPaint);
  71
  72         SkFont font(ToolUtils::create_portable_typeface());
  73
  74         SkAutoCanvasRestore acr(canvas, true);
  75
  76         const struct {
  77             const char* name;
  78             SkSamplingOptions sampling;
  79         } recs[] = {
  80             { "none",   SkSamplingOptions(SkFilterMode::kNearest) },
  81             { "low",    SkSamplingOptions(SkFilterMode::kLinear) },
  82             { "medium", SkSamplingOptions(SkFilterMode::kLinear, SkMipmapMode::kLinear) },
  83             { "high",   SkSamplingOptions(SkCubicResampler::Mitchell()) },
  84         };
  85
  86         for (const auto& rec : recs) {
  87             constexpr SkTileMode kTM = SkTileMode::kRepeat;
  88             bmpPaint.setShader(fBmp.makeShader(kTM, kTM, rec.sampling, lm));
  89             canvas->drawRect(rect, bmpPaint);
  90             canvas->drawString(rec.name, 20, 40, font, textPaint);
  91             canvas->translate(250, 0);
  92         }
  93
  94     }
  95
  96     SkBitmap    fBmp;
  97
  98     using INHERITED = skiagm::GM;
  99 };
 100
 101 //////////////////////////////////////////////////////////////////////////////
 102
 103 DEF_GM(return new BmpFilterQualityRepeat;)