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