imagemasksubset.cpp 2.9 KB

12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091
  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. #include "gm/gm.h"
  8. #include "include/core/SkCanvas.h"
  9. #include "include/core/SkColorSpace.h"
  10. #include "include/core/SkImage.h"
  11. #include "include/core/SkImageGenerator.h"
  12. #include "include/core/SkImageInfo.h"
  13. #include "include/core/SkPaint.h"
  14. #include "include/core/SkRect.h"
  15. #include "include/core/SkRefCnt.h"
  16. #include "include/core/SkSize.h"
  17. #include "include/core/SkSurface.h"
  18. #include "include/core/SkTypes.h"
  19. #include "src/core/SkMakeUnique.h"
  20. #include "tools/ToolUtils.h"
  21. namespace {
  22. const SkISize kSize = SkISize::Make(100, 100);
  23. const SkIRect kSubset = SkIRect::MakeLTRB(25, 25, 75, 75);
  24. const SkRect kDest = SkRect::MakeXYWH(10, 10, 100, 100);
  25. sk_sp<SkImage> make_mask(const sk_sp<SkSurface>& surface) {
  26. ToolUtils::draw_checkerboard(surface->getCanvas(), 0x80808080, 0x00000000, 5);
  27. return surface->makeImageSnapshot();
  28. }
  29. class MaskGenerator final : public SkImageGenerator {
  30. public:
  31. MaskGenerator(const SkImageInfo& info) : INHERITED(info) {}
  32. bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes, const Options&)
  33. override {
  34. SkImageInfo surfaceInfo = info;
  35. if (kAlpha_8_SkColorType == info.colorType()) {
  36. surfaceInfo = surfaceInfo.makeColorSpace(nullptr);
  37. }
  38. make_mask(SkSurface::MakeRasterDirect(surfaceInfo, pixels, rowBytes));
  39. return true;
  40. }
  41. private:
  42. typedef SkImageGenerator INHERITED;
  43. };
  44. using MakerT = sk_sp<SkImage>(*)(SkCanvas*, const SkImageInfo&);
  45. const MakerT makers[] = {
  46. // SkImage_Raster
  47. [](SkCanvas*, const SkImageInfo& info) -> sk_sp<SkImage> {
  48. return make_mask(SkSurface::MakeRaster(info));
  49. },
  50. // SkImage_Gpu
  51. [](SkCanvas* c, const SkImageInfo& info) -> sk_sp<SkImage> {
  52. sk_sp<SkSurface> surface;
  53. surface = SkSurface::MakeRenderTarget(c->getGrContext(), SkBudgeted::kNo, info);
  54. return make_mask(surface ? surface : SkSurface::MakeRaster(info));
  55. },
  56. // SkImage_Lazy
  57. [](SkCanvas*, const SkImageInfo& info) -> sk_sp<SkImage> {
  58. return SkImage::MakeFromGenerator(skstd::make_unique<MaskGenerator>(info));
  59. },
  60. };
  61. } // anonymous ns
  62. // Checks whether subset SkImages preserve the original color type (A8 in this case).
  63. DEF_SIMPLE_GM(imagemasksubset, canvas, 480, 480) {
  64. SkPaint paint;
  65. paint.setColor(0xff00ff00);
  66. const SkImageInfo info = SkImageInfo::MakeA8(kSize.width(), kSize.height());
  67. for (size_t i = 0; i < SK_ARRAY_COUNT(makers); ++i) {
  68. sk_sp<SkImage> image = makers[i](canvas, info);
  69. if (image) {
  70. canvas->drawImageRect(image, SkRect::Make(kSubset), kDest, &paint);
  71. sk_sp<SkImage> subset = image->makeSubset(kSubset);
  72. canvas->drawImageRect(subset, kDest.makeOffset(kSize.width() * 1.5f, 0), &paint);
  73. }
  74. canvas->translate(0, kSize.height() * 1.5f);
  75. }
  76. }