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(GrContext * context,SkCanvas * canvas,bool vertical)14 static void draw_tile_bitmap_with_fractional_offset(GrContext* context, SkCanvas* canvas,
15 bool vertical) {
16 // This should match kBmpSmallTileSize in SkGpuDevice.cpp. Note that our canvas size is tuned
17 // to this constant as well.
18 const int kTileSize = 1 << 10;
19
20 // We're going to draw a section of the bitmap that intersects 3 tiles (3x1 or 1x3).
21 // We need that to be < 50% of the total image, so our image is 7 tiles (7x1 or 1x7).
22 const int kBitmapLongEdge = 7 * kTileSize;
23 const int kBitmapShortEdge = 1 * kTileSize;
24
25 // To trigger tiling, we also need the image to be more than 50% of the cache, so we ensure the
26 // cache is sized to make that true.
27 const int kBitmapArea = kBitmapLongEdge * kBitmapShortEdge;
28 const size_t kBitmapBytes = kBitmapArea * sizeof(SkPMColor);
29
30 int oldMaxResources;
31 size_t oldMaxResourceBytes;
32 context->getResourceCacheLimits(&oldMaxResources, &oldMaxResourceBytes);
33
34 const size_t newMaxResourceBytes = kBitmapBytes + (kBitmapBytes / 2);
35 context->setResourceCacheLimits(oldMaxResources, newMaxResourceBytes);
36
37 // Construct our bitmap as either very wide or very tall
38 SkBitmap bmp;
39 bmp.allocN32Pixels(vertical ? kBitmapShortEdge : kBitmapLongEdge,
40 vertical ? kBitmapLongEdge : kBitmapShortEdge, true);
41 bmp.eraseColor(SK_ColorWHITE);
42
43 // Draw ten strips with varying fractional offset to catch any rasterization issues with tiling
44 for (int i = 0; i < 10; ++i) {
45 float offset = i * 0.1f;
46 if (vertical) {
47 canvas->drawBitmapRect(bmp, SkRect::MakeXYWH(0.0f, (kTileSize - 50) + offset,
48 32.0f, 1124.0f),
49 SkRect::MakeXYWH(37.0f * i, 0.0f, 32.0f, 1124.0f), nullptr);
50 } else {
51 canvas->drawBitmapRect(bmp, SkRect::MakeXYWH((kTileSize - 50) + offset, 0.0f,
52 1124.0f, 32.0f),
53 SkRect::MakeXYWH(0.0f, 37.0f * i, 1124.0f, 32.0f), nullptr);
54 }
55 }
56
57 // Restore the cache
58 context->setResourceCacheLimits(oldMaxResources, oldMaxResourceBytes);
59 }
60
61 DEF_SIMPLE_GPU_GM_BG(
62 bitmaptiled_fractional_horizontal, context, rtc, canvas, 1124, 365, SK_ColorBLACK) {
63 draw_tile_bitmap_with_fractional_offset(context, canvas, false);
64 }
65
66 DEF_SIMPLE_GPU_GM_BG(
67 bitmaptiled_fractional_vertical, context, rtc, canvas, 365, 1124, SK_ColorBLACK) {
68 draw_tile_bitmap_with_fractional_offset(context, canvas, true);
69 }
70