resizeimagefilter.cpp 4.1 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119
  1. /*
  2. * Copyright 2013 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/SkColor.h"
  10. #include "include/core/SkFilterQuality.h"
  11. #include "include/core/SkImage.h"
  12. #include "include/core/SkImageFilter.h"
  13. #include "include/core/SkMatrix.h"
  14. #include "include/core/SkPaint.h"
  15. #include "include/core/SkRect.h"
  16. #include "include/core/SkRefCnt.h"
  17. #include "include/core/SkScalar.h"
  18. #include "include/core/SkSize.h"
  19. #include "include/core/SkString.h"
  20. #include "include/core/SkSurface.h"
  21. #include "include/effects/SkImageSource.h"
  22. #include <utility>
  23. namespace skiagm {
  24. class ResizeGM : public GM {
  25. public:
  26. ResizeGM() {
  27. this->setBGColor(0x00000000);
  28. }
  29. protected:
  30. SkString onShortName() override {
  31. return SkString("resizeimagefilter");
  32. }
  33. void draw(SkCanvas* canvas,
  34. const SkRect& rect,
  35. const SkSize& deviceSize,
  36. SkFilterQuality filterQuality,
  37. sk_sp<SkImageFilter> input) {
  38. SkRect dstRect;
  39. canvas->getTotalMatrix().mapRect(&dstRect, rect);
  40. canvas->save();
  41. SkScalar deviceScaleX = deviceSize.width() / dstRect.width();
  42. SkScalar deviceScaleY = deviceSize.height() / dstRect.height();
  43. canvas->translate(rect.x(), rect.y());
  44. canvas->scale(deviceScaleX, deviceScaleY);
  45. canvas->translate(-rect.x(), -rect.y());
  46. SkMatrix matrix;
  47. matrix.setScale(SkScalarInvert(deviceScaleX), SkScalarInvert(deviceScaleY));
  48. sk_sp<SkImageFilter> filter(SkImageFilter::MakeMatrixFilter(matrix,
  49. filterQuality,
  50. std::move(input)));
  51. SkPaint filteredPaint;
  52. filteredPaint.setImageFilter(std::move(filter));
  53. canvas->saveLayer(&rect, &filteredPaint);
  54. SkPaint paint;
  55. paint.setColor(0xFF00FF00);
  56. SkRect ovalRect = rect;
  57. ovalRect.inset(SkIntToScalar(4), SkIntToScalar(4));
  58. canvas->drawOval(ovalRect, paint);
  59. canvas->restore(); // for saveLayer
  60. canvas->restore();
  61. }
  62. SkISize onISize() override {
  63. return SkISize::Make(520, 100);
  64. }
  65. void onDraw(SkCanvas* canvas) override {
  66. canvas->clear(SK_ColorBLACK);
  67. const SkRect srcRect = SkRect::MakeWH(96, 96);
  68. const SkSize deviceSize = SkSize::Make(16, 16);
  69. this->draw(canvas, srcRect, deviceSize, kNone_SkFilterQuality, nullptr);
  70. canvas->translate(srcRect.width() + SkIntToScalar(10), 0);
  71. this->draw(canvas, srcRect, deviceSize, kLow_SkFilterQuality, nullptr);
  72. canvas->translate(srcRect.width() + SkIntToScalar(10), 0);
  73. this->draw(canvas, srcRect, deviceSize, kMedium_SkFilterQuality, nullptr);
  74. canvas->translate(srcRect.width() + SkIntToScalar(10), 0);
  75. this->draw(canvas, srcRect, deviceSize, kHigh_SkFilterQuality, nullptr);
  76. {
  77. sk_sp<SkSurface> surface(SkSurface::MakeRasterN32Premul(16, 16));
  78. SkCanvas* surfaceCanvas = surface->getCanvas();
  79. surfaceCanvas->clear(0x000000);
  80. {
  81. SkPaint paint;
  82. paint.setColor(0xFF00FF00);
  83. SkRect ovalRect = SkRect::MakeWH(16, 16);
  84. ovalRect.inset(SkIntToScalar(2)/3, SkIntToScalar(2)/3);
  85. surfaceCanvas->drawOval(ovalRect, paint);
  86. }
  87. sk_sp<SkImage> image(surface->makeImageSnapshot());
  88. SkRect inRect = SkRect::MakeXYWH(-4, -4, 20, 20);
  89. SkRect outRect = SkRect::MakeXYWH(-24, -24, 120, 120);
  90. sk_sp<SkImageFilter> source(
  91. SkImageSource::Make(std::move(image), inRect, outRect, kHigh_SkFilterQuality));
  92. canvas->translate(srcRect.width() + SkIntToScalar(10), 0);
  93. this->draw(canvas, srcRect, deviceSize, kHigh_SkFilterQuality, std::move(source));
  94. }
  95. }
  96. private:
  97. typedef GM INHERITED;
  98. };
  99. //////////////////////////////////////////////////////////////////////////////
  100. DEF_GM(return new ResizeGM; )
  101. }