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/gm.h"
9 #include "include/core/SkBitmap.h"
10 #include "include/core/SkCanvas.h"
11 #include "include/core/SkColor.h"
12 #include "include/core/SkImage.h"
13 #include "include/core/SkRect.h"
14 #include "include/core/SkTiledImageUtils.h"
15 #include "include/core/SkTypes.h"
16 #include "include/gpu/ganesh/GrDirectContext.h"
17 #include "include/gpu/ganesh/GrRecordingContext.h"
18
19 // This test exercises Ganesh's drawing of tiled bitmaps. In particular, that the offsets and the
20 // extents of the tiles don't cause gaps between tiles.
draw_tile_bitmap_with_fractional_offset(SkCanvas * canvas,bool vertical,bool manual)21 static void draw_tile_bitmap_with_fractional_offset(SkCanvas* canvas, bool vertical, bool manual) {
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 if (auto dContext = GrAsDirectContext(canvas->recordingContext())) {
32 // To trigger tiling, we also need the image to be more than 50% of the cache, so we
33 // ensure the cache is sized to make that true.
34 const int kBitmapArea = kBitmapLongEdge * kBitmapShortEdge;
35 const size_t kBitmapBytes = kBitmapArea * sizeof(SkPMColor);
36
37 const size_t newMaxResourceBytes = kBitmapBytes + (kBitmapBytes / 2);
38 dContext->setResourceCacheLimit(newMaxResourceBytes);
39 }
40
41 // Construct our bitmap as either very wide or very tall
42 SkBitmap bmp;
43 bmp.allocN32Pixels(vertical ? kBitmapShortEdge : kBitmapLongEdge,
44 vertical ? kBitmapLongEdge : kBitmapShortEdge, true);
45 bmp.eraseColor(SK_ColorWHITE);
46
47 // Draw ten strips with varying fractional offset to catch any rasterization issues with tiling
48 for (int i = 0; i < 10; ++i) {
49 float offset = i * 0.1f;
50
51 SkRect src = vertical ? SkRect::MakeXYWH(0, (kTileSize - 50) + offset, 32, 1124.0f)
52 : SkRect::MakeXYWH((kTileSize - 50) + offset, 0, 1124, 32);
53 SkRect dst = vertical ? SkRect::MakeXYWH(37.0f * i, 0.0f, 32.0f, 1124.0f)
54 : SkRect::MakeXYWH(0.0f, 37.0f * i, 1124.0f, 32.0f);
55
56 if (manual) {
57 SkTiledImageUtils::DrawImageRect(canvas, bmp.asImage(), src, dst, SkSamplingOptions(),
58 /* paint= */ nullptr,
59 SkCanvas::kStrict_SrcRectConstraint);
60 } else {
61 canvas->drawImageRect(bmp.asImage(), src, dst, SkSamplingOptions(),
62 /* paint= */ nullptr,
63 SkCanvas::kStrict_SrcRectConstraint);
64 }
65 }
66 }
67
68 // In Graphite, it is always the client's responsibility to manually do tiled image draws, so we
69 // only run the non-manual tests in Ganesh.
70 DEF_SIMPLE_GPU_GM_BG(bitmaptiled_fractional_horizontal, rContext, canvas, 1124, 365, SK_ColorBLACK) {
71 draw_tile_bitmap_with_fractional_offset(canvas, /* vertical= */ false, /* manual= */ false);
72 }
73 DEF_SIMPLE_GPU_GM_BG(bitmaptiled_fractional_vertical, rContext, canvas, 365, 1124, SK_ColorBLACK) {
74 draw_tile_bitmap_with_fractional_offset(canvas, /* vertical= */ true, /* manual= */ false);
75 }
76
77 DEF_SIMPLE_GM_BG(bitmaptiled_fractional_horizontal_manual, canvas, 1124, 365, SK_ColorBLACK) {
78 draw_tile_bitmap_with_fractional_offset(canvas, /* vertical= */ false, /* manual= */ true);
79 }
80 DEF_SIMPLE_GM_BG(bitmaptiled_fractional_vertical_manual, canvas, 365, 1124, SK_ColorBLACK) {
81 draw_tile_bitmap_with_fractional_offset(canvas, /* vertical= */ true, /* manual= */ true);
82 }
83