SampleFilterQuality.cpp 9.3 KB

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  1. /*
  2. * Copyright 2015 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 "include/core/SkCanvas.h"
  8. #include "include/core/SkData.h"
  9. #include "include/core/SkFont.h"
  10. #include "include/core/SkPath.h"
  11. #include "include/core/SkSurface.h"
  12. #include "include/core/SkTime.h"
  13. #include "include/effects/SkGradientShader.h"
  14. #include "include/utils/SkInterpolator.h"
  15. #include "include/utils/SkRandom.h"
  16. #include "samplecode/Sample.h"
  17. #include "tools/Resources.h"
  18. #include "tools/timer/TimeUtils.h"
  19. static sk_sp<SkSurface> make_surface(SkCanvas* canvas, const SkImageInfo& info) {
  20. auto surface = canvas->makeSurface(info);
  21. if (!surface) {
  22. surface = SkSurface::MakeRaster(info);
  23. }
  24. return surface;
  25. }
  26. static sk_sp<SkShader> make_shader(const SkRect& bounds) {
  27. sk_sp<SkImage> image(GetResourceAsImage("images/mandrill_128.png"));
  28. return image ? image->makeShader() : nullptr;
  29. }
  30. #define N 128
  31. #define ANGLE_DELTA 3
  32. #define SCALE_DELTA (SK_Scalar1 / 32)
  33. static sk_sp<SkImage> make_image() {
  34. SkImageInfo info = SkImageInfo::MakeN32(N, N, kOpaque_SkAlphaType);
  35. auto surface(SkSurface::MakeRaster(info));
  36. SkCanvas* canvas = surface->getCanvas();
  37. canvas->drawColor(SK_ColorWHITE);
  38. SkPath path;
  39. path.setFillType(SkPath::kEvenOdd_FillType);
  40. path.addRect(SkRect::MakeWH(N/2, N));
  41. path.addRect(SkRect::MakeWH(N, N/2));
  42. path.moveTo(0, 0); path.lineTo(N, 0); path.lineTo(0, N); path.close();
  43. SkPaint paint;
  44. paint.setShader(make_shader(SkRect::MakeWH(N, N)));
  45. canvas->drawPath(path, paint);
  46. return surface->makeImageSnapshot();
  47. }
  48. static sk_sp<SkImage> zoom_up(SkSurface* origSurf, SkImage* orig) {
  49. const SkScalar S = 16; // amount to scale up
  50. const int D = 2; // dimension scaling for the offscreen
  51. // since we only view the center, don't need to produce the entire thing
  52. SkImageInfo info = SkImageInfo::MakeN32(orig->width() * D, orig->height() * D,
  53. kOpaque_SkAlphaType);
  54. auto surface(origSurf->makeSurface(info));
  55. SkCanvas* canvas = surface->getCanvas();
  56. canvas->drawColor(SK_ColorWHITE);
  57. canvas->scale(S, S);
  58. canvas->translate(-SkScalarHalf(orig->width()) * (S - D) / S,
  59. -SkScalarHalf(orig->height()) * (S - D) / S);
  60. canvas->drawImage(orig, 0, 0, nullptr);
  61. if (S > 3) {
  62. SkPaint paint;
  63. paint.setColor(SK_ColorWHITE);
  64. for (int i = 1; i < orig->height(); ++i) {
  65. SkScalar y = SkIntToScalar(i);
  66. canvas->drawLine(0, y, SkIntToScalar(orig->width()), y, paint);
  67. }
  68. for (int i = 1; i < orig->width(); ++i) {
  69. SkScalar x = SkIntToScalar(i);
  70. canvas->drawLine(x, 0, x, SkIntToScalar(orig->height()), paint);
  71. }
  72. }
  73. return surface->makeImageSnapshot();
  74. }
  75. struct AnimValue {
  76. SkScalar fValue;
  77. SkScalar fMin;
  78. SkScalar fMax;
  79. SkScalar fMod;
  80. operator SkScalar() const { return fValue; }
  81. void set(SkScalar value, SkScalar min, SkScalar max) {
  82. fValue = value;
  83. fMin = min;
  84. fMax = max;
  85. fMod = 0;
  86. }
  87. void setMod(SkScalar value, SkScalar mod) {
  88. fValue = value;
  89. fMin = 0;
  90. fMax = 0;
  91. fMod = mod;
  92. }
  93. SkScalar inc(SkScalar delta) {
  94. fValue += delta;
  95. return this->fixUp();
  96. }
  97. SkScalar fixUp() {
  98. if (fMod) {
  99. fValue = SkScalarMod(fValue, fMod);
  100. } else {
  101. if (fValue > fMax) {
  102. fValue = fMax;
  103. } else if (fValue < fMin) {
  104. fValue = fMin;
  105. }
  106. }
  107. return fValue;
  108. }
  109. };
  110. static void draw_box_frame(SkCanvas* canvas, int width, int height) {
  111. SkPaint p;
  112. p.setStyle(SkPaint::kStroke_Style);
  113. p.setColor(SK_ColorRED);
  114. SkRect r = SkRect::MakeIWH(width, height);
  115. r.inset(0.5f, 0.5f);
  116. canvas->drawRect(r, p);
  117. canvas->drawLine(r.left(), r.top(), r.right(), r.bottom(), p);
  118. canvas->drawLine(r.left(), r.bottom(), r.right(), r.top(), p);
  119. }
  120. class FilterQualityView : public Sample {
  121. sk_sp<SkImage> fImage;
  122. AnimValue fScale, fAngle;
  123. SkSize fCell;
  124. SkInterpolator fTrans;
  125. SkMSec fCurrTime;
  126. bool fShowFatBits;
  127. public:
  128. FilterQualityView() : fTrans(2, 2), fShowFatBits(true) {
  129. fCell.set(256, 256);
  130. fScale.set(1, SK_Scalar1 / 8, 1);
  131. fAngle.setMod(0, 360);
  132. SkScalar values[2];
  133. fTrans.setMirror(true);
  134. fTrans.setReset(true);
  135. fCurrTime = 0;
  136. fTrans.setRepeatCount(999);
  137. values[0] = values[1] = 0;
  138. fTrans.setKeyFrame(0, fCurrTime, values);
  139. values[0] = values[1] = 1;
  140. fTrans.setKeyFrame(1, fCurrTime + 2000, values);
  141. }
  142. protected:
  143. SkString name() override { return SkString("FilterQuality"); }
  144. bool onChar(SkUnichar uni) override {
  145. switch (uni) {
  146. case '1': fAngle.inc(-ANGLE_DELTA); return true;
  147. case '2': fAngle.inc( ANGLE_DELTA); return true;
  148. case '3': fScale.inc(-SCALE_DELTA); return true;
  149. case '4': fScale.inc( SCALE_DELTA); return true;
  150. case '5': fShowFatBits = !fShowFatBits; return true;
  151. default: break;
  152. }
  153. return false;
  154. }
  155. void drawTheImage(SkCanvas* canvas, const SkISize& size, SkFilterQuality filter,
  156. SkScalar dx, SkScalar dy) {
  157. SkPaint paint;
  158. paint.setAntiAlias(true);
  159. paint.setFilterQuality(filter);
  160. SkAutoCanvasRestore acr(canvas, true);
  161. canvas->translate(dx, dy);
  162. canvas->translate(SkScalarHalf(size.width()), SkScalarHalf(size.height()));
  163. canvas->scale(fScale, fScale);
  164. canvas->rotate(fAngle);
  165. canvas->drawImage(fImage.get(), -SkScalarHalf(fImage->width()), -SkScalarHalf(fImage->height()),
  166. &paint);
  167. if (false) {
  168. acr.restore();
  169. draw_box_frame(canvas, size.width(), size.height());
  170. }
  171. }
  172. void drawHere(SkCanvas* canvas, SkFilterQuality filter, SkScalar dx, SkScalar dy) {
  173. SkCanvas* origCanvas = canvas;
  174. SkAutoCanvasRestore acr(canvas, true);
  175. SkISize size = SkISize::Make(fImage->width(), fImage->height());
  176. sk_sp<SkSurface> surface;
  177. if (fShowFatBits) {
  178. // scale up so we don't clip rotations
  179. SkImageInfo info = SkImageInfo::MakeN32(fImage->width() * 2, fImage->height() * 2,
  180. kOpaque_SkAlphaType);
  181. surface = make_surface(canvas, info);
  182. canvas = surface->getCanvas();
  183. canvas->drawColor(SK_ColorWHITE);
  184. size.set(info.width(), info.height());
  185. } else {
  186. canvas->translate(SkScalarHalf(fCell.width() - fImage->width()),
  187. SkScalarHalf(fCell.height() - fImage->height()));
  188. }
  189. this->drawTheImage(canvas, size, filter, dx, dy);
  190. if (surface) {
  191. sk_sp<SkImage> orig(surface->makeImageSnapshot());
  192. sk_sp<SkImage> zoomed(zoom_up(surface.get(), orig.get()));
  193. origCanvas->drawImage(zoomed.get(),
  194. SkScalarHalf(fCell.width() - zoomed->width()),
  195. SkScalarHalf(fCell.height() - zoomed->height()));
  196. }
  197. }
  198. void drawBorders(SkCanvas* canvas) {
  199. SkPaint p;
  200. p.setStyle(SkPaint::kStroke_Style);
  201. p.setColor(SK_ColorBLUE);
  202. SkRect r = SkRect::MakeWH(fCell.width() * 2, fCell.height() * 2);
  203. r.inset(SK_ScalarHalf, SK_ScalarHalf);
  204. canvas->drawRect(r, p);
  205. canvas->drawLine(r.left(), r.centerY(), r.right(), r.centerY(), p);
  206. canvas->drawLine(r.centerX(), r.top(), r.centerX(), r.bottom(), p);
  207. }
  208. void onOnceBeforeDraw() override {
  209. fImage = make_image();
  210. }
  211. void onDrawContent(SkCanvas* canvas) override {
  212. fCell.set(this->height() / 2, this->height() / 2);
  213. SkScalar trans[2];
  214. fTrans.timeToValues(fCurrTime, trans);
  215. for (int y = 0; y < 2; ++y) {
  216. for (int x = 0; x < 2; ++x) {
  217. int index = y * 2 + x;
  218. SkAutoCanvasRestore acr(canvas, true);
  219. canvas->translate(fCell.width() * x, fCell.height() * y);
  220. SkRect r = SkRect::MakeWH(fCell.width(), fCell.height());
  221. r.inset(4, 4);
  222. canvas->clipRect(r);
  223. this->drawHere(canvas, SkFilterQuality(index), trans[0], trans[1]);
  224. }
  225. }
  226. this->drawBorders(canvas);
  227. const SkScalar textX = fCell.width() * 2 + 30;
  228. SkFont font(nullptr, 36);
  229. SkPaint paint;
  230. canvas->drawString(SkStringPrintf("%.8g", (float)fScale), textX, 100, font, paint);
  231. canvas->drawString(SkStringPrintf("%.8g", (float)fAngle), textX, 150, font, paint);
  232. canvas->drawString(SkStringPrintf("%.8g", trans[0] ), textX, 200, font, paint);
  233. canvas->drawString(SkStringPrintf("%.8g", trans[1] ), textX, 250, font, paint);
  234. }
  235. bool onAnimate(double nanos) override {
  236. fCurrTime = TimeUtils::NanosToMSec(nanos);
  237. return true;
  238. }
  239. private:
  240. typedef Sample INHERITED;
  241. };
  242. //////////////////////////////////////////////////////////////////////////////
  243. DEF_SAMPLE( return new FilterQualityView(); )