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      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     DrawResult onDraw(SkCanvas* canvas, SkString* errorMsg) override {
     30         // Create image.
     31         const char* path = "images/mandrill_512_q075.jpg";
     32         sk_sp<SkImage> image = GetResourceAsImage(path);
     33         if (!image) {
     34             *errorMsg = "Couldn't load images/mandrill_512_q075.jpg. "
     35                         "Did you forget to set the resource path?";
     36             return DrawResult::kFail;
     37         }
     38 
     39         // Create matching bitmap.
     40         std::unique_ptr<SkCodec> codec(SkCodec::MakeFromStream(GetResourceAsStream(path)));
     41         SkBitmap bitmap;
     42         bitmap.allocPixels(codec->getInfo());
     43         codec->getPixels(codec->getInfo(), bitmap.getPixels(), bitmap.rowBytes());
     44 
     45         // The GM will be displayed in a 2x2 grid.
     46         // The top two squares show an sRGB image, then bitmap, drawn to a legacy canvas.
     47         SkImageInfo linearInfo = SkImageInfo::MakeN32(2*kSize, kSize, kOpaque_SkAlphaType);
     48         SkBitmap legacyBMCanvas;
     49         legacyBMCanvas.allocPixels(linearInfo);
     50         SkCanvas legacyCanvas(legacyBMCanvas);
     51         legacyCanvas.drawImage(image, 0.0f, 0.0f, nullptr);
     52         legacyCanvas.translate(SkScalar(kSize), 0.0f);
     53         legacyCanvas.drawBitmap(bitmap, 0.0f, 0.0f, nullptr);
     54         canvas->drawBitmap(legacyBMCanvas, 0.0f, 0.0f, nullptr);
     55         canvas->translate(0.0f, SkScalar(kSize));
     56 
     57         // The bottom two squares show an sRGB image, then bitmap, drawn to a srgb canvas.
     58         SkImageInfo srgbInfo = SkImageInfo::MakeS32(2*kSize, kSize, kOpaque_SkAlphaType);
     59         SkBitmap srgbBMCanvas;
     60         srgbBMCanvas.allocPixels(srgbInfo);
     61         SkCanvas srgbCanvas(srgbBMCanvas);
     62         srgbCanvas.drawImage(image, 0.0f, 0.0f, nullptr);
     63         srgbCanvas.translate(SkScalar(kSize), 0.0f);
     64         srgbCanvas.drawBitmap(bitmap, 0.0f, 0.0f, nullptr);
     65         canvas->drawBitmap(srgbBMCanvas, 0.0f, 0.0f, nullptr);
     66         return DrawResult::kOk;
     67     }
     68 
     69 private:
     70     static constexpr int kSize = 512;
     71 
     72     typedef GM INHERITED;
     73 };
     74 
     75 //////////////////////////////////////////////////////////////////////////////
     76 
     77 DEF_GM( return new BitmapImageGM; )
     78 
     79 }
     80