drawimageset.cpp 12 KB

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  1. /*
  2. * Copyright 2018 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/SkBlendMode.h"
  9. #include "include/core/SkCanvas.h"
  10. #include "include/core/SkColor.h"
  11. #include "include/core/SkFilterQuality.h"
  12. #include "include/core/SkImage.h"
  13. #include "include/core/SkImageInfo.h"
  14. #include "include/core/SkMatrix.h"
  15. #include "include/core/SkPaint.h"
  16. #include "include/core/SkPoint.h"
  17. #include "include/core/SkRect.h"
  18. #include "include/core/SkRefCnt.h"
  19. #include "include/core/SkScalar.h"
  20. #include "include/core/SkShader.h"
  21. #include "include/core/SkSize.h"
  22. #include "include/core/SkString.h"
  23. #include "include/core/SkSurface.h"
  24. #include "include/core/SkTileMode.h"
  25. #include "include/core/SkTypes.h"
  26. #include "include/effects/SkGradientShader.h"
  27. #include "tools/ToolUtils.h"
  28. #include <algorithm>
  29. #include <initializer_list>
  30. #include <utility>
  31. // Makes a set of m x n tiled images to be drawn with SkCanvas::experimental_drawImageSetV1().
  32. static void make_image_tiles(int tileW, int tileH, int m, int n, const SkColor colors[4],
  33. SkCanvas::ImageSetEntry set[]) {
  34. const int w = tileW * m;
  35. const int h = tileH * n;
  36. auto surf = SkSurface::MakeRaster(
  37. SkImageInfo::Make(w, h, kRGBA_8888_SkColorType, kPremul_SkAlphaType));
  38. surf->getCanvas()->clear(SK_ColorLTGRAY);
  39. static constexpr SkScalar kStripeW = 10;
  40. static constexpr SkScalar kStripeSpacing = 30;
  41. SkPaint paint;
  42. SkPoint pts1[] = {{0.f, 0.f}, {(SkScalar)w, (SkScalar)h}};
  43. auto grad = SkGradientShader::MakeLinear(pts1, colors, nullptr, 2, SkTileMode::kClamp);
  44. paint.setShader(std::move(grad));
  45. paint.setAntiAlias(true);
  46. paint.setStyle(SkPaint::kStroke_Style);
  47. paint.setStrokeWidth(kStripeW);
  48. SkPoint stripePts[] = {{-w - kStripeW, -kStripeW}, {kStripeW, h + kStripeW}};
  49. while (stripePts[0].fX <= w) {
  50. surf->getCanvas()->drawPoints(SkCanvas::kLines_PointMode, 2, stripePts, paint);
  51. stripePts[0].fX += kStripeSpacing;
  52. stripePts[1].fX += kStripeSpacing;
  53. }
  54. SkPoint pts2[] = {{0.f, (SkScalar)h}, {(SkScalar)w, 0.f}};
  55. grad = SkGradientShader::MakeLinear(pts2, colors + 2, nullptr, 2, SkTileMode::kClamp);
  56. paint.setShader(std::move(grad));
  57. paint.setBlendMode(SkBlendMode::kMultiply);
  58. stripePts[0] = {-w - kStripeW, h + kStripeW};
  59. stripePts[1] = {kStripeW, -kStripeW};
  60. while (stripePts[0].fX <= w) {
  61. surf->getCanvas()->drawPoints(SkCanvas::kLines_PointMode, 2, stripePts, paint);
  62. stripePts[0].fX += kStripeSpacing;
  63. stripePts[1].fX += kStripeSpacing;
  64. }
  65. auto fullImage = surf->makeImageSnapshot();
  66. for (int y = 0; y < n; ++y) {
  67. for (int x = 0; x < m; ++x) {
  68. // Images will have 1 pixel of overlap at interior seams for filtering continuity.
  69. SkIRect subset = SkIRect::MakeXYWH(x * tileW - 1, y * tileH - 1, tileW + 2, tileH + 2);
  70. set[y * m + x].fAAFlags = SkCanvas::kNone_QuadAAFlags;
  71. if (x == 0) {
  72. subset.fLeft = 0;
  73. set[y * m + x].fAAFlags |= SkCanvas::kLeft_QuadAAFlag;
  74. }
  75. if (x == m - 1) {
  76. subset.fRight = w;
  77. set[y * m + x].fAAFlags |= SkCanvas::kRight_QuadAAFlag;
  78. }
  79. if (y == 0) {
  80. subset.fTop = 0;
  81. set[y * m + x].fAAFlags |= SkCanvas::kTop_QuadAAFlag;
  82. }
  83. if (y == n - 1) {
  84. subset.fBottom = h;
  85. set[y * m + x].fAAFlags |= SkCanvas::kBottom_QuadAAFlag;
  86. }
  87. set[y * m + x].fImage = fullImage->makeSubset(subset);
  88. set[y * m + x].fSrcRect =
  89. SkRect::MakeXYWH(x == 0 ? 0 : 1, y == 0 ? 0 : 1, tileW, tileH);
  90. set[y * m + x].fDstRect = SkRect::MakeXYWH(x * tileW, y * tileH, tileW, tileH);
  91. set[y * m + x].fAlpha = 1.f;
  92. SkASSERT(set[y * m + x].fImage);
  93. }
  94. }
  95. }
  96. namespace skiagm {
  97. class DrawImageSetGM : public GM {
  98. private:
  99. SkString onShortName() override { return SkString("draw_image_set"); }
  100. SkISize onISize() override { return {1000, 725}; }
  101. void onOnceBeforeDraw() override {
  102. static constexpr SkColor kColors[] = {SK_ColorCYAN, SK_ColorBLACK,
  103. SK_ColorMAGENTA, SK_ColorBLACK};
  104. make_image_tiles(kTileW, kTileH, kM, kN, kColors, fSet);
  105. }
  106. void onDraw(SkCanvas* canvas) override {
  107. SkScalar d = SkVector{kM * kTileW, kN * kTileH}.length();
  108. SkMatrix matrices[4];
  109. // rotation
  110. matrices[0].setRotate(30);
  111. matrices[0].postTranslate(d / 3, 0);
  112. // perespective
  113. SkPoint src[4];
  114. SkRect::MakeWH(kM * kTileW, kN * kTileH).toQuad(src);
  115. SkPoint dst[4] = {{0, 0},
  116. {kM * kTileW + 10.f, -5.f},
  117. {kM * kTileW - 28.f, kN * kTileH + 40.f},
  118. {45.f, kN * kTileH - 25.f}};
  119. SkAssertResult(matrices[1].setPolyToPoly(src, dst, 4));
  120. matrices[1].postTranslate(d, 50.f);
  121. // skew
  122. matrices[2].setRotate(-60.f);
  123. matrices[2].postSkew(0.5f, -1.15f);
  124. matrices[2].postScale(0.6f, 1.05f);
  125. matrices[2].postTranslate(d, 2.6f * d);
  126. // perspective + mirror in x.
  127. dst[1] = {-.25 * kM * kTileW, 0};
  128. dst[0] = {5.f / 4.f * kM * kTileW, 0};
  129. dst[3] = {2.f / 3.f * kM * kTileW, 1 / 2.f * kN * kTileH};
  130. dst[2] = {1.f / 3.f * kM * kTileW, 1 / 2.f * kN * kTileH - 0.1f * kTileH};
  131. SkAssertResult(matrices[3].setPolyToPoly(src, dst, 4));
  132. matrices[3].postTranslate(100.f, d);
  133. for (auto fm : {kNone_SkFilterQuality, kLow_SkFilterQuality}) {
  134. SkPaint setPaint;
  135. setPaint.setFilterQuality(fm);
  136. setPaint.setBlendMode(SkBlendMode::kSrcOver);
  137. for (size_t m = 0; m < SK_ARRAY_COUNT(matrices); ++m) {
  138. // Draw grid of red lines at interior tile boundaries.
  139. static constexpr SkScalar kLineOutset = 10.f;
  140. SkPaint paint;
  141. paint.setAntiAlias(true);
  142. paint.setColor(SK_ColorRED);
  143. paint.setStyle(SkPaint::kStroke_Style);
  144. paint.setStrokeWidth(0.f);
  145. for (int x = 1; x < kM; ++x) {
  146. SkPoint pts[] = {{x * kTileW, 0}, {x * kTileW, kN * kTileH}};
  147. matrices[m].mapPoints(pts, 2);
  148. SkVector v = pts[1] - pts[0];
  149. v.setLength(v.length() + kLineOutset);
  150. canvas->drawLine(pts[1] - v, pts[0] + v, paint);
  151. }
  152. for (int y = 1; y < kN; ++y) {
  153. SkPoint pts[] = {{0, y * kTileH}, {kTileW * kM, y * kTileH}};
  154. matrices[m].mapPoints(pts, 2);
  155. SkVector v = pts[1] - pts[0];
  156. v.setLength(v.length() + kLineOutset);
  157. canvas->drawLine(pts[1] - v, pts[0] + v, paint);
  158. }
  159. canvas->save();
  160. canvas->concat(matrices[m]);
  161. canvas->experimental_DrawEdgeAAImageSet(fSet, kM * kN, nullptr, nullptr, &setPaint,
  162. SkCanvas::kFast_SrcRectConstraint);
  163. canvas->restore();
  164. }
  165. // A more exotic case with an unusual blend mode, mixed aa flags set, and alpha,
  166. // subsets the image
  167. SkCanvas::ImageSetEntry entry;
  168. entry.fSrcRect = SkRect::MakeWH(kTileW, kTileH).makeInset(kTileW / 4.f, kTileH / 4.f);
  169. entry.fDstRect = SkRect::MakeWH(2 * kTileW, 2 * kTileH).makeOffset(d / 4, 2 * d);
  170. entry.fImage = fSet[0].fImage;
  171. entry.fAlpha = 0.7f;
  172. entry.fAAFlags = SkCanvas::kLeft_QuadAAFlag | SkCanvas::kTop_QuadAAFlag;
  173. canvas->save();
  174. canvas->rotate(3.f);
  175. setPaint.setBlendMode(SkBlendMode::kExclusion);
  176. canvas->experimental_DrawEdgeAAImageSet(&entry, 1, nullptr, nullptr, &setPaint,
  177. SkCanvas::kFast_SrcRectConstraint);
  178. canvas->restore();
  179. canvas->translate(2 * d, 0);
  180. }
  181. }
  182. static constexpr int kM = 4;
  183. static constexpr int kN = 3;
  184. static constexpr SkScalar kTileW = 30;
  185. static constexpr SkScalar kTileH = 60;
  186. SkCanvas::ImageSetEntry fSet[kM * kN];
  187. };
  188. // This GM exercises rect-stays-rect type matrices to test that filtering and antialiasing are not
  189. // incorrectly disabled.
  190. class DrawImageSetRectToRectGM : public GM {
  191. private:
  192. SkString onShortName() override { return SkString("draw_image_set_rect_to_rect"); }
  193. SkISize onISize() override { return {1250, 850}; }
  194. void onOnceBeforeDraw() override {
  195. static constexpr SkColor kColors[] = {SK_ColorBLUE, SK_ColorWHITE,
  196. SK_ColorRED, SK_ColorWHITE};
  197. make_image_tiles(kTileW, kTileH, kM, kN, kColors, fSet);
  198. }
  199. void onDraw(SkCanvas* canvas) override {
  200. ToolUtils::draw_checkerboard(canvas, SK_ColorBLACK, SK_ColorWHITE, 50);
  201. static constexpr SkScalar kW = kM * kTileW;
  202. static constexpr SkScalar kH = kN * kTileH;
  203. SkMatrix matrices[5];
  204. // Identity
  205. matrices[0].reset();
  206. // 90 degree rotation
  207. matrices[1].setRotate(90, kW / 2.f, kH / 2.f);
  208. // Scaling
  209. matrices[2].setScale(2.f, 0.5f);
  210. // Mirror in x and y
  211. matrices[3].setScale(-1.f, -1.f);
  212. matrices[3].postTranslate(kW, kH);
  213. // Mirror in y, rotate, and scale.
  214. matrices[4].setScale(1.f, -1.f);
  215. matrices[4].postTranslate(0, kH);
  216. matrices[4].postRotate(90, kW / 2.f, kH / 2.f);
  217. matrices[4].postScale(2.f, 0.5f);
  218. SkPaint paint;
  219. paint.setFilterQuality(kLow_SkFilterQuality);
  220. paint.setBlendMode(SkBlendMode::kSrcOver);
  221. static constexpr SkScalar kTranslate = SkTMax(kW, kH) * 2.f + 10.f;
  222. canvas->translate(5.f, 5.f);
  223. canvas->save();
  224. for (SkScalar frac : {0.f, 0.5f}) {
  225. canvas->save();
  226. canvas->translate(frac, frac);
  227. for (size_t m = 0; m < SK_ARRAY_COUNT(matrices); ++m) {
  228. canvas->save();
  229. canvas->concat(matrices[m]);
  230. canvas->experimental_DrawEdgeAAImageSet(fSet, kM * kN, nullptr, nullptr, &paint,
  231. SkCanvas::kFast_SrcRectConstraint);
  232. canvas->restore();
  233. canvas->translate(kTranslate, 0);
  234. }
  235. canvas->restore();
  236. canvas->restore();
  237. canvas->translate(0, kTranslate);
  238. canvas->save();
  239. }
  240. for (SkVector scale : {SkVector{2.f, 0.5f}, SkVector{0.5, 2.f}}) {
  241. SkCanvas::ImageSetEntry scaledSet[kM * kN];
  242. std::copy_n(fSet, kM * kN, scaledSet);
  243. for (int i = 0; i < kM * kN; ++i) {
  244. scaledSet[i].fDstRect.fLeft *= scale.fX;
  245. scaledSet[i].fDstRect.fTop *= scale.fY;
  246. scaledSet[i].fDstRect.fRight *= scale.fX;
  247. scaledSet[i].fDstRect.fBottom *= scale.fY;
  248. scaledSet[i].fAlpha = 0 == (i % 3) ? 0.4f : 1.f;
  249. }
  250. for (size_t m = 0; m < SK_ARRAY_COUNT(matrices); ++m) {
  251. canvas->save();
  252. canvas->concat(matrices[m]);
  253. canvas->experimental_DrawEdgeAAImageSet(scaledSet, kM * kN, nullptr, nullptr,
  254. &paint, SkCanvas::kFast_SrcRectConstraint);
  255. canvas->restore();
  256. canvas->translate(kTranslate, 0);
  257. }
  258. canvas->restore();
  259. canvas->translate(0, kTranslate);
  260. canvas->save();
  261. }
  262. }
  263. static constexpr int kM = 2;
  264. static constexpr int kN = 2;
  265. static constexpr int kTileW = 40;
  266. static constexpr int kTileH = 50;
  267. SkCanvas::ImageSetEntry fSet[kM * kN];
  268. };
  269. DEF_GM(return new DrawImageSetGM();)
  270. DEF_GM(return new DrawImageSetRectToRectGM();)
  271. } // namespace skiagm