blob: e5e53e6b0a287952922c183724c89c543278f88c [file] [log] [blame]
/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm/gm.h"
#include "include/core/SkBitmap.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkImage.h"
#include "include/core/SkRect.h"
#include "include/core/SkTypes.h"
#include "include/gpu/GrDirectContext.h"
#include "include/gpu/GrRecordingContext.h"
// This test exercises Ganesh's drawing of tiled bitmaps. In particular, that the offsets and the
// extents of the tiles don't cause gaps between tiles.
static void draw_tile_bitmap_with_fractional_offset(SkCanvas* canvas, bool vertical) {
// This should match kBmpSmallTileSize in SkGpuDevice.cpp. Note that our canvas size is tuned
// to this constant as well.
const int kTileSize = 1 << 10;
// We're going to draw a section of the bitmap that intersects 3 tiles (3x1 or 1x3).
// We need that to be < 50% of the total image, so our image is 7 tiles (7x1 or 1x7).
const int kBitmapLongEdge = 7 * kTileSize;
const int kBitmapShortEdge = 1 * kTileSize;
if (auto dContext = GrAsDirectContext(canvas->recordingContext())) {
// To trigger tiling, we also need the image to be more than 50% of the cache, so we
// ensure the cache is sized to make that true.
const int kBitmapArea = kBitmapLongEdge * kBitmapShortEdge;
const size_t kBitmapBytes = kBitmapArea * sizeof(SkPMColor);
const size_t newMaxResourceBytes = kBitmapBytes + (kBitmapBytes / 2);
dContext->setResourceCacheLimit(newMaxResourceBytes);
}
// Construct our bitmap as either very wide or very tall
SkBitmap bmp;
bmp.allocN32Pixels(vertical ? kBitmapShortEdge : kBitmapLongEdge,
vertical ? kBitmapLongEdge : kBitmapShortEdge, true);
bmp.eraseColor(SK_ColorWHITE);
// Draw ten strips with varying fractional offset to catch any rasterization issues with tiling
for (int i = 0; i < 10; ++i) {
float offset = i * 0.1f;
if (vertical) {
canvas->drawImageRect(bmp.asImage(),
SkRect::MakeXYWH(0, (kTileSize - 50) + offset, 32, 1124.0f),
SkRect::MakeXYWH(37.0f * i, 0.0f, 32.0f, 1124.0f),
SkSamplingOptions(), nullptr,
SkCanvas::kStrict_SrcRectConstraint);
} else {
canvas->drawImageRect(bmp.asImage(),
SkRect::MakeXYWH((kTileSize - 50) + offset, 0, 1124, 32),
SkRect::MakeXYWH(0.0f, 37.0f * i, 1124.0f, 32.0f),
SkSamplingOptions(), nullptr,
SkCanvas::kStrict_SrcRectConstraint);
}
}
}
DEF_SIMPLE_GM_BG(bitmaptiled_fractional_horizontal, canvas, 1124, 365, SK_ColorBLACK) {
draw_tile_bitmap_with_fractional_offset(canvas, /* vertical= */ false);
}
DEF_SIMPLE_GM_BG(bitmaptiled_fractional_vertical, canvas, 365, 1124, SK_ColorBLACK) {
draw_tile_bitmap_with_fractional_offset(canvas, /* vertical= */ true);
}