DrawBitmapRectTest.cpp 8.3 KB

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  1. /*
  2. * Copyright 2011 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/SkBitmap.h"
  8. #include "include/core/SkCanvas.h"
  9. #include "include/core/SkColor.h"
  10. #include "include/core/SkMatrix.h"
  11. #include "include/core/SkPaint.h"
  12. #include "include/core/SkPath.h"
  13. #include "include/core/SkRect.h"
  14. #include "include/core/SkScalar.h"
  15. #include "include/core/SkShader.h"
  16. #include "include/core/SkSize.h"
  17. #include "include/core/SkTileMode.h"
  18. #include "include/core/SkTypes.h"
  19. #include "include/utils/SkRandom.h"
  20. #include "src/core/SkMatrixUtils.h"
  21. #include "tests/Test.h"
  22. ///////////////////////////////////////////////////////////////////////////////
  23. static void rand_matrix(SkMatrix* mat, SkRandom& rand, unsigned mask) {
  24. mat->setIdentity();
  25. if (mask & SkMatrix::kTranslate_Mask) {
  26. mat->postTranslate(rand.nextSScalar1(), rand.nextSScalar1());
  27. }
  28. if (mask & SkMatrix::kScale_Mask) {
  29. mat->postScale(rand.nextSScalar1(), rand.nextSScalar1());
  30. }
  31. if (mask & SkMatrix::kAffine_Mask) {
  32. mat->postRotate(rand.nextSScalar1() * 360);
  33. }
  34. if (mask & SkMatrix::kPerspective_Mask) {
  35. mat->setPerspX(rand.nextSScalar1());
  36. mat->setPerspY(rand.nextSScalar1());
  37. }
  38. }
  39. static void rand_size(SkISize* size, SkRandom& rand) {
  40. size->set(rand.nextU() & 0xFFFF, rand.nextU() & 0xFFFF);
  41. }
  42. static void test_treatAsSprite(skiatest::Reporter* reporter) {
  43. SkMatrix mat;
  44. SkISize size;
  45. SkRandom rand;
  46. SkPaint noaaPaint;
  47. SkPaint aaPaint;
  48. aaPaint.setAntiAlias(true);
  49. // assert: translate-only no-aa can always be treated as sprite
  50. for (int i = 0; i < 1000; ++i) {
  51. rand_matrix(&mat, rand, SkMatrix::kTranslate_Mask);
  52. for (int j = 0; j < 1000; ++j) {
  53. rand_size(&size, rand);
  54. REPORTER_ASSERT(reporter, SkTreatAsSprite(mat, size, noaaPaint));
  55. }
  56. }
  57. // assert: rotate/perspect is never treated as sprite
  58. for (int i = 0; i < 1000; ++i) {
  59. rand_matrix(&mat, rand, SkMatrix::kAffine_Mask | SkMatrix::kPerspective_Mask);
  60. for (int j = 0; j < 1000; ++j) {
  61. rand_size(&size, rand);
  62. REPORTER_ASSERT(reporter, !SkTreatAsSprite(mat, size, noaaPaint));
  63. REPORTER_ASSERT(reporter, !SkTreatAsSprite(mat, size, aaPaint));
  64. }
  65. }
  66. size.set(500, 600);
  67. const SkScalar tooMuchSubpixel = 100.1f;
  68. mat.setTranslate(tooMuchSubpixel, 0);
  69. REPORTER_ASSERT(reporter, !SkTreatAsSprite(mat, size, aaPaint));
  70. mat.setTranslate(0, tooMuchSubpixel);
  71. REPORTER_ASSERT(reporter, !SkTreatAsSprite(mat, size, aaPaint));
  72. const SkScalar tinySubPixel = 100.02f;
  73. mat.setTranslate(tinySubPixel, 0);
  74. REPORTER_ASSERT(reporter, SkTreatAsSprite(mat, size, aaPaint));
  75. mat.setTranslate(0, tinySubPixel);
  76. REPORTER_ASSERT(reporter, SkTreatAsSprite(mat, size, aaPaint));
  77. const SkScalar twoThirds = SK_Scalar1 * 2 / 3;
  78. const SkScalar bigScale = (size.width() + twoThirds) / size.width();
  79. mat.setScale(bigScale, bigScale);
  80. REPORTER_ASSERT(reporter, !SkTreatAsSprite(mat, size, noaaPaint));
  81. REPORTER_ASSERT(reporter, !SkTreatAsSprite(mat, size, aaPaint));
  82. const SkScalar oneThird = SK_Scalar1 / 3;
  83. const SkScalar smallScale = (size.width() + oneThird) / size.width();
  84. mat.setScale(smallScale, smallScale);
  85. REPORTER_ASSERT(reporter, SkTreatAsSprite(mat, size, noaaPaint));
  86. REPORTER_ASSERT(reporter, !SkTreatAsSprite(mat, size, aaPaint));
  87. const SkScalar oneFortyth = SK_Scalar1 / 40;
  88. const SkScalar tinyScale = (size.width() + oneFortyth) / size.width();
  89. mat.setScale(tinyScale, tinyScale);
  90. REPORTER_ASSERT(reporter, SkTreatAsSprite(mat, size, noaaPaint));
  91. REPORTER_ASSERT(reporter, SkTreatAsSprite(mat, size, aaPaint));
  92. }
  93. static void test_wacky_bitmapshader(skiatest::Reporter* reporter,
  94. int width, int height) {
  95. SkBitmap dev;
  96. dev.allocN32Pixels(0x56F, 0x4f6);
  97. dev.eraseColor(SK_ColorTRANSPARENT); // necessary, so we know if we draw to it
  98. SkMatrix matrix;
  99. SkCanvas c(dev);
  100. matrix.setAll(-119.34097f,
  101. -43.436558f,
  102. 93489.945f,
  103. 43.436558f,
  104. -119.34097f,
  105. 123.98426f,
  106. 0, 0, SK_Scalar1);
  107. c.concat(matrix);
  108. SkBitmap bm;
  109. if (bm.tryAllocN32Pixels(width, height)) {
  110. bm.eraseColor(SK_ColorRED);
  111. } else {
  112. SkASSERT(false);
  113. return;
  114. }
  115. matrix.setAll(0.0078740157f,
  116. 0,
  117. SkIntToScalar(249),
  118. 0,
  119. 0.0078740157f,
  120. SkIntToScalar(239),
  121. 0, 0, SK_Scalar1);
  122. SkPaint paint;
  123. paint.setShader(bm.makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, &matrix));
  124. SkRect r = SkRect::MakeXYWH(681, 239, 695, 253);
  125. c.drawRect(r, paint);
  126. for (int y = 0; y < dev.height(); ++y) {
  127. for (int x = 0; x < dev.width(); ++x) {
  128. if (SK_ColorTRANSPARENT == *dev.getAddr32(x, y)) {
  129. REPORTER_ASSERT(reporter, false);
  130. return;
  131. }
  132. }
  133. }
  134. }
  135. // ATTENTION We should always draw each of these sizes safely now. ATTENTION
  136. // ATTENTION I'm leaving this next /*comment*/ for posterity. ATTENTION
  137. /*
  138. * Original bug was asserting that the matrix-proc had generated a (Y) value
  139. * that was out of range. This led (in the release build) to the sampler-proc
  140. * reading memory out-of-bounds of the original bitmap.
  141. *
  142. * We were numerically overflowing our 16bit coordinates that we communicate
  143. * between these two procs. The fixes was in two parts:
  144. *
  145. * 1. Just don't draw bitmaps larger than 64K-1 in width or height, since we
  146. * can't represent those coordinates in our transport format (yet).
  147. * 2. Perform an unsigned shift during the calculation, so we don't get
  148. * sign-extension bleed when packing the two values (X,Y) into our 32bit
  149. * slot.
  150. *
  151. * This tests exercises the original setup, plus 2 more to ensure that we can,
  152. * in fact, handle bitmaps at 64K-1 (assuming we don't exceed the total
  153. * memory allocation limit).
  154. */
  155. static void test_giantrepeat_crbug118018(skiatest::Reporter* reporter) {
  156. static const struct {
  157. int fWidth;
  158. int fHeight;
  159. } gTests[] = {
  160. { 0x1b294, 0x7f}, // crbug 118018 (width exceeds 64K)... should draw safely now.
  161. { 0xFFFF, 0x7f }, // should draw, test max width
  162. { 0x7f, 0xFFFF }, // should draw, test max height
  163. };
  164. for (size_t i = 0; i < SK_ARRAY_COUNT(gTests); ++i) {
  165. test_wacky_bitmapshader(reporter,
  166. gTests[i].fWidth, gTests[i].fHeight);
  167. }
  168. }
  169. ///////////////////////////////////////////////////////////////////////////////
  170. static void test_nan_antihair() {
  171. SkBitmap bm;
  172. bm.allocN32Pixels(20, 20);
  173. SkCanvas canvas(bm);
  174. SkPath path;
  175. path.moveTo(0, 0);
  176. path.lineTo(10, SK_ScalarNaN);
  177. SkPaint paint;
  178. paint.setAntiAlias(true);
  179. paint.setStyle(SkPaint::kStroke_Style);
  180. // before our fix to SkScan_Antihair.cpp to check for integral NaN (0x800...)
  181. // this would trigger an assert/crash.
  182. //
  183. // see rev. 3558
  184. canvas.drawPath(path, paint);
  185. }
  186. static bool check_for_all_zeros(const SkBitmap& bm) {
  187. size_t count = bm.width() * bm.bytesPerPixel();
  188. for (int y = 0; y < bm.height(); y++) {
  189. const uint8_t* ptr = reinterpret_cast<const uint8_t*>(bm.getAddr(0, y));
  190. for (size_t i = 0; i < count; i++) {
  191. if (ptr[i]) {
  192. return false;
  193. }
  194. }
  195. }
  196. return true;
  197. }
  198. static const int gWidth = 256;
  199. static const int gHeight = 256;
  200. static void create(SkBitmap* bm, SkColor color) {
  201. bm->allocN32Pixels(gWidth, gHeight);
  202. bm->eraseColor(color);
  203. }
  204. DEF_TEST(DrawBitmapRect, reporter) {
  205. SkBitmap src, dst;
  206. create(&src, 0xFFFFFFFF);
  207. create(&dst, 0);
  208. SkCanvas canvas(dst);
  209. SkIRect srcR = { gWidth, 0, gWidth + 16, 16 };
  210. SkRect dstR = { 0, 0, SkIntToScalar(16), SkIntToScalar(16) };
  211. canvas.drawBitmapRect(src, srcR, dstR, nullptr);
  212. // ensure that we draw nothing if srcR does not intersect the bitmap
  213. REPORTER_ASSERT(reporter, check_for_all_zeros(dst));
  214. test_nan_antihair();
  215. test_giantrepeat_crbug118018(reporter);
  216. test_treatAsSprite(reporter);
  217. }