Bitmap_readPixels.cpp 1.2 KB

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  1. // Copyright 2019 Google LLC.
  2. // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
  3. #include "tools/fiddle/examples.h"
  4. // HASH=b2cbbbbcffb618865d8aae3bc04b2a62
  5. REG_FIDDLE(Bitmap_readPixels, 256, 128, false, 0) {
  6. void draw(SkCanvas* canvas) {
  7. const int width = 256;
  8. const int height = 64;
  9. SkImageInfo srcInfo = SkImageInfo::MakeN32Premul(width, height);
  10. SkColor gradColors[] = { 0xFFAA3300, 0x7F881122 };
  11. SkPoint gradPoints[] = { { 0, 0 }, { 256, 0 } };
  12. SkPaint paint;
  13. paint.setShader(SkGradientShader::MakeLinear(gradPoints, gradColors, nullptr,
  14. SK_ARRAY_COUNT(gradColors), SkTileMode::kClamp));
  15. SkBitmap bitmap;
  16. bitmap.allocPixels(srcInfo);
  17. SkCanvas srcCanvas(bitmap);
  18. srcCanvas.drawRect(SkRect::MakeWH(width, height), paint);
  19. canvas->drawBitmap(bitmap, 0, 0);
  20. SkImageInfo dstInfo = srcInfo.makeColorType(kARGB_4444_SkColorType);
  21. std::vector<int16_t> dstPixels;
  22. dstPixels.resize(height * width);
  23. bitmap.readPixels(dstInfo, &dstPixels.front(), width * 2, 0, 0);
  24. SkPixmap dstPixmap(dstInfo, &dstPixels.front(), width * 2);
  25. bitmap.installPixels(dstPixmap);
  26. canvas->drawBitmap(bitmap, 0, 64);
  27. }
  28. } // END FIDDLE