SampleSubpixelTranslate.cpp 4.0 KB

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  1. /*
  2. * Copyright 2014 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 "samplecode/Sample.h"
  8. #include "include/core/SkCanvas.h"
  9. #include "include/core/SkColorPriv.h"
  10. #include "include/core/SkFont.h"
  11. #include "include/core/SkStream.h"
  12. #include "include/effects/SkBlurMaskFilter.h"
  13. #include "include/utils/SkRandom.h"
  14. #include "samplecode/DecodeFile.h"
  15. #include "tools/Resources.h"
  16. // Intended to exercise pixel snapping observed with scaled images (and
  17. // with non-scaled images, but for a different reason): Bug 1145
  18. class SubpixelTranslateView : public Sample {
  19. public:
  20. SubpixelTranslateView(const char imageFilename[],
  21. float horizontalVelocity,
  22. float verticalVelocity)
  23. : fHorizontalVelocity(horizontalVelocity)
  24. , fVerticalVelocity(verticalVelocity)
  25. {
  26. if (!DecodeDataToBitmap(GetResourceAsData(imageFilename), &fBM)) {
  27. fBM.allocN32Pixels(1, 1);
  28. *(fBM.getAddr32(0,0)) = 0xFF0000FF; // red == bad
  29. }
  30. fCurPos = SkPoint::Make(0,0);
  31. fSize = 200;
  32. }
  33. protected:
  34. SkBitmap fBM;
  35. SkScalar fSize;
  36. float fHorizontalVelocity, fVerticalVelocity;
  37. SkPoint fCurPos;
  38. SkString name() override { return SkString("SubpixelTranslate"); }
  39. void onDrawContent(SkCanvas* canvas) override {
  40. static const SkFilterQuality gQualitys[] = {
  41. kNone_SkFilterQuality,
  42. kLow_SkFilterQuality,
  43. kMedium_SkFilterQuality,
  44. kHigh_SkFilterQuality
  45. };
  46. SkPaint paint;
  47. SkFont font(nullptr, 48);
  48. font.setSubpixel(true);
  49. paint.setAntiAlias(true);
  50. for (size_t i = 0; i < SK_ARRAY_COUNT(gQualitys); ++i) {
  51. paint.setFilterQuality(gQualitys[i]);
  52. SkRect r = SkRect::MakeXYWH( fCurPos.fX + i * (fSize + 10), fCurPos.fY, fSize, fSize );
  53. canvas->drawBitmapRect( fBM, r, &paint );
  54. }
  55. canvas->drawString("AA Scaled", fCurPos.fX + SK_ARRAY_COUNT(gQualitys) * (fSize + 10),
  56. fCurPos.fY + fSize/2, font, paint);
  57. paint.setAntiAlias(false);
  58. font.setEdging(SkFont::Edging::kAlias);
  59. for (size_t i = 0; i < SK_ARRAY_COUNT(gQualitys); ++i) {
  60. paint.setFilterQuality(gQualitys[i]);
  61. SkRect r = SkRect::MakeXYWH( fCurPos.fX + i * (fSize + 10), fCurPos.fY + fSize + 10, fSize, fSize );
  62. canvas->drawBitmapRect( fBM, r, &paint );
  63. }
  64. canvas->drawString("Scaled", fCurPos.fX + SK_ARRAY_COUNT(gQualitys) * (fSize + 10),
  65. fCurPos.fY + fSize + 10 + fSize/2, font, paint);
  66. paint.setAntiAlias(true);
  67. font.setEdging(SkFont::Edging::kAntiAlias);
  68. for (size_t i = 0; i < SK_ARRAY_COUNT(gQualitys); ++i) {
  69. paint.setFilterQuality(gQualitys[i]);
  70. canvas->drawBitmap( fBM, fCurPos.fX + i * (fBM.width() + 10), fCurPos.fY + 2*(fSize + 10), &paint );
  71. }
  72. canvas->drawString("AA No Scale",
  73. fCurPos.fX + SK_ARRAY_COUNT(gQualitys) * (fBM.width() + 10),
  74. fCurPos.fY + 2*(fSize + 10) + fSize/2, font, paint);
  75. paint.setAntiAlias(false);
  76. font.setEdging(SkFont::Edging::kAlias);
  77. for (size_t i = 0; i < SK_ARRAY_COUNT(gQualitys); ++i) {
  78. paint.setFilterQuality(gQualitys[i]);
  79. canvas->drawBitmap( fBM, fCurPos.fX + i * (fBM.width() + 10), fCurPos.fY + 2*(fSize + 10) + fBM.height() + 10, &paint );
  80. }
  81. canvas->drawString("No Scale", fCurPos.fX + SK_ARRAY_COUNT(gQualitys) * (fBM.width() + 10),
  82. fCurPos.fY + 2*(fSize + 10) + fBM.height() + 10 + fSize/2, font, paint);
  83. fCurPos.fX += fHorizontalVelocity;
  84. fCurPos.fY += fVerticalVelocity;
  85. }
  86. private:
  87. typedef Sample INHERITED;
  88. };
  89. //////////////////////////////////////////////////////////////////////////////
  90. DEF_SAMPLE( return new SubpixelTranslateView("images/mandrill_256.png", .05f, .05f); )