1 /*
2 * Copyright 2017 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
8 #include "gm.h"
9
10 #if SK_SUPPORT_GPU
11 #include "GrContext.h"
12
13 // This test exercises Ganesh's drawing of tiled bitmaps. In particular, that the offsets and the
14 // extents of the tiles don't causes gaps between tiles.
draw_tile_bitmap_with_fractional_offset(SkCanvas * canvas,bool vertical)15 static void draw_tile_bitmap_with_fractional_offset(SkCanvas* canvas, bool vertical) {
16 GrContext* context = canvas->getGrContext();
17 if (!context) {
18 skiagm::GM::DrawGpuOnlyMessage(canvas);
19 return;
20 }
21
22 // This should match kBmpSmallTileSize in SkGpuDevice.cpp. Note that our canvas size is tuned
23 // to this constant as well.
24 const int kTileSize = 1 << 10;
25
26 // We're going to draw a section of the bitmap that intersects 3 tiles (3x1 or 1x3).
27 // We need that to be < 50% of the total image, so our image is 7 tiles (7x1 or 1x7).
28 const int kBitmapLongEdge = 7 * kTileSize;
29 const int kBitmapShortEdge = 1 * kTileSize;
30
31 // To trigger tiling, we also need the image to be more than 50% of the cache, so we ensure the
32 // cache is sized to make that true.
33 const int kBitmapArea = kBitmapLongEdge * kBitmapShortEdge;
34 const size_t kBitmapBytes = kBitmapArea * sizeof(SkPMColor);
35
36 int oldMaxResources;
37 size_t oldMaxResourceBytes;
38 context->getResourceCacheLimits(&oldMaxResources, &oldMaxResourceBytes);
39
40 const size_t newMaxResourceBytes = kBitmapBytes + (kBitmapBytes / 2);
41 context->setResourceCacheLimits(oldMaxResources, newMaxResourceBytes);
42
43 // Construct our bitmap as either very wide or very tall
44 SkBitmap bmp;
45 bmp.allocN32Pixels(vertical ? kBitmapShortEdge : kBitmapLongEdge,
46 vertical ? kBitmapLongEdge : kBitmapShortEdge, true);
47 bmp.eraseColor(SK_ColorWHITE);
48
49 // Draw ten strips with varying fractional offset to catch any rasterization issues with tiling
50 for (int i = 0; i < 10; ++i) {
51 float offset = i * 0.1f;
52 if (vertical) {
53 canvas->drawBitmapRect(bmp, SkRect::MakeXYWH(0.0f, (kTileSize - 50) + offset,
54 32.0f, 1124.0f),
55 SkRect::MakeXYWH(37.0f * i, 0.0f, 32.0f, 1124.0f), nullptr);
56 } else {
57 canvas->drawBitmapRect(bmp, SkRect::MakeXYWH((kTileSize - 50) + offset, 0.0f,
58 1124.0f, 32.0f),
59 SkRect::MakeXYWH(0.0f, 37.0f * i, 1124.0f, 32.0f), nullptr);
60 }
61 }
62
63 // Restore the cache
64 context->setResourceCacheLimits(oldMaxResources, oldMaxResourceBytes);
65 }
66
67 DEF_SIMPLE_GM_BG(bitmaptiled_fractional_horizontal, canvas, 1124, 365, SK_ColorBLACK) {
68 draw_tile_bitmap_with_fractional_offset(canvas, false);
69 }
70
71 DEF_SIMPLE_GM_BG(bitmaptiled_fractional_vertical, canvas, 365, 1124, SK_ColorBLACK) {
72 draw_tile_bitmap_with_fractional_offset(canvas, true);
73 }
74
75 #endif
76