gm/bitmapimage.cpp

   1 /*
   2  * Copyright 2016 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.h"
   9 #include "Resources.h"
  10 #include "SkCodec.h"
  11 #include "SkImage.h"
  12
  13 namespace skiagm {
  14
  15 class BitmapImageGM : public GM {
  16 public:
  17     BitmapImageGM() {}
  18
  19 protected:
  20
  21     SkString onShortName() override {
  22         return SkString("bitmap-image-srgb-legacy");
  23     }
  24
  25     SkISize onISize() override {
  26         return SkISize::Make(2*kSize, 2*kSize);
  27     }
  28
  29     void onDraw(SkCanvas* canvas) override {
  30         // Create image.
  31         const char* path = "mandrill_512_q075.jpg";
  32         sk_sp<SkImage> image = GetResourceAsImage(path);
  33         if (!image) {
  34             SkDebugf("Failure: Is the resource path set properly?");
  35             return;
  36         }
  37
  38         // Create matching bitmap.
  39         std::unique_ptr<SkCodec> codec(SkCodec::NewFromStream(GetResourceAsStream(path)));
  40         SkBitmap bitmap;
  41         bitmap.allocPixels(codec->getInfo());
  42         codec->getPixels(codec->getInfo(), bitmap.getPixels(), bitmap.rowBytes());
  43
  44         // The GM will be displayed in a 2x2 grid.
  45         // The top two squares show an sRGB image, then bitmap, drawn to a legacy canvas.
  46         SkImageInfo linearInfo = SkImageInfo::MakeN32(2*kSize, kSize, kOpaque_SkAlphaType);
  47         SkBitmap legacyBMCanvas;
  48         legacyBMCanvas.allocPixels(linearInfo);
  49         SkCanvas legacyCanvas(legacyBMCanvas);
  50         legacyCanvas.drawImage(image, 0.0f, 0.0f, nullptr);
  51         legacyCanvas.translate(SkScalar(kSize), 0.0f);
  52         legacyCanvas.drawBitmap(bitmap, 0.0f, 0.0f, nullptr);
  53         canvas->drawBitmap(legacyBMCanvas, 0.0f, 0.0f, nullptr);
  54         canvas->translate(0.0f, SkScalar(kSize));
  55
  56         // The bottom two squares show an sRGB image, then bitmap, drawn to a srgb canvas.
  57         SkImageInfo srgbInfo = SkImageInfo::MakeS32(2*kSize, kSize, kOpaque_SkAlphaType);
  58         SkBitmap srgbBMCanvas;
  59         srgbBMCanvas.allocPixels(srgbInfo);
  60         SkCanvas srgbCanvas(srgbBMCanvas);
  61         srgbCanvas.drawImage(image, 0.0f, 0.0f, nullptr);
  62         srgbCanvas.translate(SkScalar(kSize), 0.0f);
  63         srgbCanvas.drawBitmap(bitmap, 0.0f, 0.0f, nullptr);
  64         canvas->drawBitmap(srgbBMCanvas, 0.0f, 0.0f, nullptr);
  65     }
  66
  67 private:
  68     static constexpr int kSize = 512;
  69
  70     typedef GM INHERITED;
  71 };
  72
  73 //////////////////////////////////////////////////////////////////////////////
  74
  75 static GM* MyFactory(void*) { return new BitmapImageGM; }
  76 static GMRegistry reg(MyFactory);
  77
  78 }