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skia2/tests/TileGridTest.cpp
junov@chromium.org ef5b811426 Fixing SkTileGrid to clamp rather than clip content and querries that are outside the bounds of the grid 
This fix prevents border padding and offsets on the tile grid structure from resulting in bad clipping. The job of clipping contents is left to the playback canvas.

BUG=https://code.google.com/p/skia/issues/detail?id=1209
TEST=TileGrid unit test, 
Review URL: https://codereview.chromium.org/13493016

git-svn-id: http://skia.googlecode.com/svn/trunk@8576 2bbb7eff-a529-9590-31e7-b0007b416f81
2013-04-09 16:13:09 +00:00

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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "Test.h"
#include "SkTileGrid.h"
#include "SkTileGridPicture.h"
#include "SkCanvas.h"
#include "SkDevice.h"
enum Tile {
kTopLeft_Tile = 0x1,
kTopRight_Tile = 0x2,
kBottomLeft_Tile = 0x4,
kBottomRight_Tile = 0x8,
kAll_Tile = kTopLeft_Tile | kTopRight_Tile | kBottomLeft_Tile | kBottomRight_Tile,
};
namespace {
class MockCanvas : public SkCanvas {
public:
MockCanvas(SkDevice* device) : SkCanvas(device)
{}
virtual void drawRect(const SkRect& rect, const SkPaint&)
{
// This capture occurs before quick reject.
fRects.push(rect);
}
SkTDArray<SkRect> fRects;
};
}
class TileGridTest {
public:
static void verifyTileHits(skiatest::Reporter* reporter, SkIRect rect, uint32_t tileMask,
int borderPixels = 0) {
SkTileGridPicture::TileGridInfo info;
info.fMargin.set(borderPixels, borderPixels);
info.fOffset.setZero();
info.fTileInterval.set(10 - 2 * borderPixels, 10 - 2 * borderPixels);
SkTileGrid grid(2, 2, info, NULL);
grid.insert(NULL, rect, false);
REPORTER_ASSERT(reporter, grid.tile(0,0).count() ==
((tileMask & kTopLeft_Tile)? 1 : 0));
REPORTER_ASSERT(reporter, grid.tile(1,0).count() ==
((tileMask & kTopRight_Tile)? 1 : 0));
REPORTER_ASSERT(reporter, grid.tile(0,1).count() ==
((tileMask & kBottomLeft_Tile)? 1 : 0));
REPORTER_ASSERT(reporter, grid.tile(1,1).count() ==
((tileMask & kBottomRight_Tile)? 1 : 0));
}
static void TestUnalignedQuery(skiatest::Reporter* reporter) {
// Use SkTileGridPicture to generate a SkTileGrid with a helper
SkTileGridPicture::TileGridInfo info;
info.fMargin.setEmpty();
info.fOffset.setZero();
info.fTileInterval.set(10, 10);
SkTileGridPicture picture(20, 20, info);
SkRect rect1 = SkRect::MakeXYWH(SkIntToScalar(0), SkIntToScalar(0),
SkIntToScalar(8), SkIntToScalar(8));
SkRect rect2 = SkRect::MakeXYWH(SkIntToScalar(11), SkIntToScalar(11),
SkIntToScalar(1), SkIntToScalar(1));
SkCanvas* canvas = picture.beginRecording(20, 20, SkPicture::kOptimizeForClippedPlayback_RecordingFlag);
SkPaint paint;
canvas->drawRect(rect1, paint);
canvas->drawRect(rect2, paint);
picture.endRecording();
SkBitmap store;
store.setConfig(SkBitmap::kARGB_8888_Config, 1, 1);
store.allocPixels();
// Test parts of top-left tile
{
SkDevice device(store);
MockCanvas mockCanvas(&device);
picture.draw(&mockCanvas);
REPORTER_ASSERT(reporter, 1 == mockCanvas.fRects.count());
REPORTER_ASSERT(reporter, rect1 == mockCanvas.fRects[0]);
}
{
SkDevice device(store);
MockCanvas mockCanvas(&device);
mockCanvas.translate(SkFloatToScalar(-7.99f), SkFloatToScalar(-7.99f));
picture.draw(&mockCanvas);
REPORTER_ASSERT(reporter, 1 == mockCanvas.fRects.count());
REPORTER_ASSERT(reporter, rect1 == mockCanvas.fRects[0]);
}
// Corner overlap
{
SkDevice device(store);
MockCanvas mockCanvas(&device);
mockCanvas.translate(SkFloatToScalar(-9.5f), SkFloatToScalar(-9.5f));
picture.draw(&mockCanvas);
REPORTER_ASSERT(reporter, 2 == mockCanvas.fRects.count());
REPORTER_ASSERT(reporter, rect1 == mockCanvas.fRects[0]);
REPORTER_ASSERT(reporter, rect2 == mockCanvas.fRects[1]);
}
// Intersect bottom right tile, but does not overlap rect 2
{
SkDevice device(store);
MockCanvas mockCanvas(&device);
mockCanvas.translate(SkFloatToScalar(-16.0f), SkFloatToScalar(-16.0f));
picture.draw(&mockCanvas);
REPORTER_ASSERT(reporter, 1 == mockCanvas.fRects.count());
REPORTER_ASSERT(reporter, rect2 == mockCanvas.fRects[0]);
}
// Out of bounds queries, snap to border tiles
{
SkDevice device(store);
MockCanvas mockCanvas(&device);
mockCanvas.translate(SkFloatToScalar(2.0f), SkFloatToScalar(0.0f));
picture.draw(&mockCanvas);
REPORTER_ASSERT(reporter, 1 == mockCanvas.fRects.count());
REPORTER_ASSERT(reporter, rect1 == mockCanvas.fRects[0]);
}
{
SkDevice device(store);
MockCanvas mockCanvas(&device);
mockCanvas.translate(SkFloatToScalar(0.0f), SkFloatToScalar(2.0f));
picture.draw(&mockCanvas);
REPORTER_ASSERT(reporter, 1 == mockCanvas.fRects.count());
REPORTER_ASSERT(reporter, rect1 == mockCanvas.fRects[0]);
}
{
SkDevice device(store);
MockCanvas mockCanvas(&device);
mockCanvas.translate(SkFloatToScalar(-22.0f), SkFloatToScalar(-16.0f));
picture.draw(&mockCanvas);
REPORTER_ASSERT(reporter, 1 == mockCanvas.fRects.count());
REPORTER_ASSERT(reporter, rect2 == mockCanvas.fRects[0]);
}
{
SkDevice device(store);
MockCanvas mockCanvas(&device);
mockCanvas.translate(SkFloatToScalar(-16.0f), SkFloatToScalar(-22.0f));
picture.draw(&mockCanvas);
REPORTER_ASSERT(reporter, 1 == mockCanvas.fRects.count());
REPORTER_ASSERT(reporter, rect2 == mockCanvas.fRects[0]);
}
}
static void TestOverlapOffsetQueryAlignment(skiatest::Reporter* reporter) {
// Use SkTileGridPicture to generate a SkTileGrid with a helper
SkTileGridPicture::TileGridInfo info;
info.fMargin.set(1, 1);
info.fOffset.set(-1, -1);
info.fTileInterval.set(8, 8);
SkTileGridPicture picture(20, 20, info);
// rect landing entirely in top left tile
SkRect rect1 = SkRect::MakeXYWH(SkIntToScalar(0), SkIntToScalar(0),
SkIntToScalar(1), SkIntToScalar(1));
// rect landing entirely in center tile
SkRect rect2 = SkRect::MakeXYWH(SkIntToScalar(12), SkIntToScalar(12),
SkIntToScalar(1), SkIntToScalar(1));
// rect landing entirely in bottomright tile
SkRect rect3 = SkRect::MakeXYWH(SkIntToScalar(19), SkIntToScalar(19),
SkIntToScalar(1), SkIntToScalar(1));
SkCanvas* canvas = picture.beginRecording(20, 20, SkPicture::kOptimizeForClippedPlayback_RecordingFlag);
SkPaint paint;
canvas->drawRect(rect1, paint);
canvas->drawRect(rect2, paint);
canvas->drawRect(rect3, paint);
picture.endRecording();
SkBitmap tileBitmap;
tileBitmap.setConfig(SkBitmap::kARGB_8888_Config, 10, 10);
tileBitmap.allocPixels();
SkBitmap moreThanATileBitmap;
moreThanATileBitmap.setConfig(SkBitmap::kARGB_8888_Config, 11, 11);
moreThanATileBitmap.allocPixels();
// Test parts of top-left tile
{
// The offset should cancel the top and left borders of the top left tile
// So a look-up at interval 0-10 should be grid aligned,
SkDevice device(tileBitmap);
MockCanvas mockCanvas(&device);
picture.draw(&mockCanvas);
REPORTER_ASSERT(reporter, 1 == mockCanvas.fRects.count());
REPORTER_ASSERT(reporter, rect1 == mockCanvas.fRects[0]);
}
{
// Encroaching border by one pixel
SkDevice device(moreThanATileBitmap);
MockCanvas mockCanvas(&device);
picture.draw(&mockCanvas);
REPORTER_ASSERT(reporter, 2 == mockCanvas.fRects.count());
REPORTER_ASSERT(reporter, rect1 == mockCanvas.fRects[0]);
REPORTER_ASSERT(reporter, rect2 == mockCanvas.fRects[1]);
}
{
// Tile stride is 8 (tileWidth - 2 * border pixels
// so translating by 8, should make query grid-aligned
// with middle tile.
SkDevice device(tileBitmap);
MockCanvas mockCanvas(&device);
mockCanvas.translate(SkIntToScalar(-8), SkIntToScalar(-8));
picture.draw(&mockCanvas);
REPORTER_ASSERT(reporter, 1 == mockCanvas.fRects.count());
REPORTER_ASSERT(reporter, rect2 == mockCanvas.fRects[0]);
}
{
SkDevice device(tileBitmap);
MockCanvas mockCanvas(&device);
mockCanvas.translate(SkFloatToScalar(-7.9f), SkFloatToScalar(-7.9f));
picture.draw(&mockCanvas);
REPORTER_ASSERT(reporter, 2 == mockCanvas.fRects.count());
REPORTER_ASSERT(reporter, rect1 == mockCanvas.fRects[0]);
REPORTER_ASSERT(reporter, rect2 == mockCanvas.fRects[1]);
}
{
SkDevice device(tileBitmap);
MockCanvas mockCanvas(&device);
mockCanvas.translate(SkFloatToScalar(-8.1f), SkFloatToScalar(-8.1f));
picture.draw(&mockCanvas);
REPORTER_ASSERT(reporter, 2 == mockCanvas.fRects.count());
REPORTER_ASSERT(reporter, rect2 == mockCanvas.fRects[0]);
REPORTER_ASSERT(reporter, rect3 == mockCanvas.fRects[1]);
}
}
static void Test(skiatest::Reporter* reporter) {
// Out of bounds
verifyTileHits(reporter, SkIRect::MakeXYWH(30, 0, 1, 1), 0);
verifyTileHits(reporter, SkIRect::MakeXYWH(0, 30, 1, 1), 0);
verifyTileHits(reporter, SkIRect::MakeXYWH(-10, 0, 1, 1), 0);
verifyTileHits(reporter, SkIRect::MakeXYWH(0, -10, 1, 1), 0);
// Dilation for AA consideration
verifyTileHits(reporter, SkIRect::MakeXYWH(0, 0, 9, 9), kTopLeft_Tile);
verifyTileHits(reporter, SkIRect::MakeXYWH(0, 0, 10, 10), kAll_Tile);
verifyTileHits(reporter, SkIRect::MakeXYWH(9, 9, 1, 1), kAll_Tile);
verifyTileHits(reporter, SkIRect::MakeXYWH(10, 10, 1, 1), kAll_Tile);
verifyTileHits(reporter, SkIRect::MakeXYWH(11, 11, 1, 1), kBottomRight_Tile);
// BorderPixels
verifyTileHits(reporter, SkIRect::MakeXYWH(0, 0, 6, 6), kTopLeft_Tile, 1);
verifyTileHits(reporter, SkIRect::MakeXYWH(0, 0, 7, 7), kAll_Tile, 1);
verifyTileHits(reporter, SkIRect::MakeXYWH(9, 9, 1, 1), kAll_Tile, 1);
verifyTileHits(reporter, SkIRect::MakeXYWH(10, 10, 1, 1), kBottomRight_Tile, 1);
verifyTileHits(reporter, SkIRect::MakeXYWH(17, 17, 1, 1), kBottomRight_Tile, 1);
// BBoxes that overlap tiles
verifyTileHits(reporter, SkIRect::MakeXYWH(5, 5, 10, 1), kTopLeft_Tile | kTopRight_Tile);
verifyTileHits(reporter, SkIRect::MakeXYWH(5, 5, 1, 10), kTopLeft_Tile |
kBottomLeft_Tile);
verifyTileHits(reporter, SkIRect::MakeXYWH(5, 5, 10, 10), kAll_Tile);
verifyTileHits(reporter, SkIRect::MakeXYWH(-10, -10, 40, 40), kAll_Tile);
TestUnalignedQuery(reporter);
TestOverlapOffsetQueryAlignment(reporter);
}
};
#include "TestClassDef.h"
DEFINE_TESTCLASS("TileGrid", TileGridTestClass, TileGridTest::Test)
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