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73 lines
2.9 KiB
73 lines
2.9 KiB
4 months ago
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/*
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* Copyright 2017 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm.h"
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#include "GrContext.h"
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// This test exercises Ganesh's drawing of tiled bitmaps. In particular, that the offsets and the
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// extents of the tiles don't causes gaps between tiles.
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static void draw_tile_bitmap_with_fractional_offset(SkCanvas* canvas, bool vertical) {
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GrContext* context = canvas->getGrContext();
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if (!context) {
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skiagm::GM::DrawGpuOnlyMessage(canvas);
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return;
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}
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// This should match kBmpSmallTileSize in SkGpuDevice.cpp. Note that our canvas size is tuned
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// to this constant as well.
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const int kTileSize = 1 << 10;
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// We're going to draw a section of the bitmap that intersects 3 tiles (3x1 or 1x3).
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// We need that to be < 50% of the total image, so our image is 7 tiles (7x1 or 1x7).
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const int kBitmapLongEdge = 7 * kTileSize;
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const int kBitmapShortEdge = 1 * kTileSize;
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// To trigger tiling, we also need the image to be more than 50% of the cache, so we ensure the
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// cache is sized to make that true.
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const int kBitmapArea = kBitmapLongEdge * kBitmapShortEdge;
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const size_t kBitmapBytes = kBitmapArea * sizeof(SkPMColor);
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int oldMaxResources;
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size_t oldMaxResourceBytes;
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context->getResourceCacheLimits(&oldMaxResources, &oldMaxResourceBytes);
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const size_t newMaxResourceBytes = kBitmapBytes + (kBitmapBytes / 2);
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context->setResourceCacheLimits(oldMaxResources, newMaxResourceBytes);
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// Construct our bitmap as either very wide or very tall
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SkBitmap bmp;
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bmp.allocN32Pixels(vertical ? kBitmapShortEdge : kBitmapLongEdge,
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vertical ? kBitmapLongEdge : kBitmapShortEdge, true);
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bmp.eraseColor(SK_ColorWHITE);
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// Draw ten strips with varying fractional offset to catch any rasterization issues with tiling
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for (int i = 0; i < 10; ++i) {
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float offset = i * 0.1f;
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if (vertical) {
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canvas->drawBitmapRect(bmp, SkRect::MakeXYWH(0.0f, (kTileSize - 50) + offset,
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32.0f, 1124.0f),
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SkRect::MakeXYWH(37.0f * i, 0.0f, 32.0f, 1124.0f), nullptr);
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} else {
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canvas->drawBitmapRect(bmp, SkRect::MakeXYWH((kTileSize - 50) + offset, 0.0f,
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1124.0f, 32.0f),
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SkRect::MakeXYWH(0.0f, 37.0f * i, 1124.0f, 32.0f), nullptr);
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}
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}
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// Restore the cache
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context->setResourceCacheLimits(oldMaxResources, oldMaxResourceBytes);
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}
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DEF_SIMPLE_GM_BG(bitmaptiled_fractional_horizontal, canvas, 1124, 365, SK_ColorBLACK) {
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draw_tile_bitmap_with_fractional_offset(canvas, false);
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}
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DEF_SIMPLE_GM_BG(bitmaptiled_fractional_vertical, canvas, 365, 1124, SK_ColorBLACK) {
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draw_tile_bitmap_with_fractional_offset(canvas, true);
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}
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