lighting.cpp 8.6 KB

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  1. /*
  2. * Copyright 2012 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/SkBitmap.h"
  9. #include "include/core/SkCanvas.h"
  10. #include "include/core/SkColor.h"
  11. #include "include/core/SkImageFilter.h"
  12. #include "include/core/SkPaint.h"
  13. #include "include/core/SkPoint3.h"
  14. #include "include/core/SkRect.h"
  15. #include "include/core/SkRefCnt.h"
  16. #include "include/core/SkScalar.h"
  17. #include "include/core/SkSize.h"
  18. #include "include/core/SkString.h"
  19. #include "include/effects/SkLightingImageFilter.h"
  20. #include "include/effects/SkOffsetImageFilter.h"
  21. #include "tools/ToolUtils.h"
  22. #include "tools/timer/TimeUtils.h"
  23. #define WIDTH 330
  24. #define HEIGHT 660
  25. namespace skiagm {
  26. class ImageLightingGM : public GM {
  27. public:
  28. ImageLightingGM()
  29. : fAzimuth(SkIntToScalar(kStartAzimuth)) {
  30. this->setBGColor(0xFF000000);
  31. }
  32. protected:
  33. SkString onShortName() override {
  34. return SkString("lighting");
  35. }
  36. SkISize onISize() override {
  37. return SkISize::Make(WIDTH, HEIGHT);
  38. }
  39. void drawClippedBitmap(SkCanvas* canvas, const SkPaint& paint, int x, int y) {
  40. canvas->save();
  41. canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
  42. canvas->clipRect(SkRect::MakeWH(
  43. SkIntToScalar(fBitmap.width()), SkIntToScalar(fBitmap.height())));
  44. canvas->drawBitmap(fBitmap, 0, 0, &paint);
  45. canvas->restore();
  46. }
  47. void onOnceBeforeDraw() override {
  48. fBitmap = ToolUtils::create_string_bitmap(100, 100, 0xFFFFFFFF, 20, 70, 96, "e");
  49. }
  50. void onDraw(SkCanvas* canvas) override {
  51. canvas->clear(0xFF101010);
  52. SkPaint checkPaint;
  53. checkPaint.setColor(0xFF202020);
  54. for (int y = 0; y < HEIGHT; y += 16) {
  55. for (int x = 0; x < WIDTH; x += 16) {
  56. canvas->save();
  57. canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
  58. canvas->drawRect(SkRect::MakeXYWH(8, 0, 8, 8), checkPaint);
  59. canvas->drawRect(SkRect::MakeXYWH(0, 8, 8, 8), checkPaint);
  60. canvas->restore();
  61. }
  62. }
  63. SkScalar sinAzimuth = SkScalarSin(SkDegreesToRadians(fAzimuth)),
  64. cosAzimuth = SkScalarCos(SkDegreesToRadians(fAzimuth));
  65. SkPoint3 spotTarget = SkPoint3::Make(SkIntToScalar(40), SkIntToScalar(40), 0);
  66. SkPoint3 spotLocation = SkPoint3::Make(spotTarget.fX + 70.7214f * cosAzimuth,
  67. spotTarget.fY + 70.7214f * sinAzimuth,
  68. spotTarget.fZ + SkIntToScalar(20));
  69. SkScalar spotExponent = SK_Scalar1;
  70. SkPoint3 pointLocation = SkPoint3::Make(spotTarget.fX + 50 * cosAzimuth,
  71. spotTarget.fY + 50 * sinAzimuth,
  72. SkIntToScalar(10));
  73. SkScalar elevationRad = SkDegreesToRadians(SkIntToScalar(5));
  74. SkPoint3 distantDirection = SkPoint3::Make(cosAzimuth * SkScalarCos(elevationRad),
  75. sinAzimuth * SkScalarCos(elevationRad),
  76. SkScalarSin(elevationRad));
  77. SkScalar cutoffAngle = SkIntToScalar(15);
  78. SkScalar kd = SkIntToScalar(2);
  79. SkScalar ks = SkIntToScalar(1);
  80. SkScalar shininess = SkIntToScalar(8);
  81. SkScalar surfaceScale = SkIntToScalar(1);
  82. SkColor white(0xFFFFFFFF);
  83. SkPaint paint;
  84. SkImageFilter::CropRect cropRect(SkRect::MakeXYWH(20, 10, 60, 65));
  85. SkImageFilter::CropRect fullSizeCropRect(SkRect::MakeXYWH(0, 0, 100, 100));
  86. sk_sp<SkImageFilter> noopCropped(SkOffsetImageFilter::Make(0, 0, nullptr, &cropRect));
  87. int y = 0;
  88. for (int i = 0; i < 3; i++) {
  89. const SkImageFilter::CropRect* cr = (i == 1) ? &cropRect : (i == 2) ? &fullSizeCropRect : nullptr;
  90. sk_sp<SkImageFilter> input = (i == 2) ? noopCropped : nullptr;
  91. paint.setImageFilter(SkLightingImageFilter::MakePointLitDiffuse(pointLocation,
  92. white,
  93. surfaceScale,
  94. kd,
  95. input,
  96. cr));
  97. drawClippedBitmap(canvas, paint, 0, y);
  98. paint.setImageFilter(SkLightingImageFilter::MakeDistantLitDiffuse(distantDirection,
  99. white,
  100. surfaceScale,
  101. kd,
  102. input,
  103. cr));
  104. drawClippedBitmap(canvas, paint, 110, y);
  105. paint.setImageFilter(SkLightingImageFilter::MakeSpotLitDiffuse(spotLocation,
  106. spotTarget,
  107. spotExponent,
  108. cutoffAngle,
  109. white,
  110. surfaceScale,
  111. kd,
  112. input,
  113. cr));
  114. drawClippedBitmap(canvas, paint, 220, y);
  115. y += 110;
  116. paint.setImageFilter(SkLightingImageFilter::MakePointLitSpecular(pointLocation,
  117. white,
  118. surfaceScale,
  119. ks,
  120. shininess,
  121. input,
  122. cr));
  123. drawClippedBitmap(canvas, paint, 0, y);
  124. paint.setImageFilter(SkLightingImageFilter::MakeDistantLitSpecular(distantDirection,
  125. white,
  126. surfaceScale,
  127. ks,
  128. shininess,
  129. input,
  130. cr));
  131. drawClippedBitmap(canvas, paint, 110, y);
  132. paint.setImageFilter(SkLightingImageFilter::MakeSpotLitSpecular(spotLocation,
  133. spotTarget,
  134. spotExponent,
  135. cutoffAngle,
  136. white,
  137. surfaceScale,
  138. ks,
  139. shininess,
  140. input,
  141. cr));
  142. drawClippedBitmap(canvas, paint, 220, y);
  143. y += 110;
  144. }
  145. }
  146. bool onAnimate(double nanos) override {
  147. constexpr SkScalar kDesiredDurationSecs = 15.0f;
  148. fAzimuth = kStartAzimuth + TimeUtils::Scaled(1e-9 * nanos, 360.0f/kDesiredDurationSecs, 360.0f);
  149. return true;
  150. }
  151. private:
  152. static constexpr int kStartAzimuth = 225;
  153. SkBitmap fBitmap;
  154. SkScalar fAzimuth;
  155. typedef GM INHERITED;
  156. };
  157. //////////////////////////////////////////////////////////////////////////////
  158. DEF_GM(return new ImageLightingGM;)
  159. }