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skia2/gm/xfermodeimagefilter.cpp
senorblanco 06d54ad09a Fix SkXfermodeImageFilter GPU fast path for differing sizes. 
The GPU fast path was not doing the correct thing for input bitmaps of
differing sizes. This change brings the fast path in line with the
slow path: use the union of foreground and background bounds as bounds,
offset the draw context by the bounds translation, and translate the
foreground and background independently by their respective offsets.

Finally, we add a texture domain for the background fragment
processor, since we may access texels outside its domain.

Note: this adds two new test cases to the xfermodeimagefilter GM, so
those will need to be rebaselined.

BUG=568196
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1588633002

Review URL: https://codereview.chromium.org/1588633002
2016-01-13 13:48:54 -08:00

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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "sk_tool_utils.h"
#include "SkArithmeticMode.h"
#include "SkImage.h"
#include "SkImageSource.h"
#include "SkOffsetImageFilter.h"
#include "SkXfermodeImageFilter.h"
#define WIDTH 600
#define HEIGHT 700
#define MARGIN 12
namespace skiagm {
class XfermodeImageFilterGM : public GM {
public:
XfermodeImageFilterGM(){
this->setBGColor(0xFF000000);
}
protected:
SkString onShortName() override {
return SkString("xfermodeimagefilter");
}
SkISize onISize() override {
return SkISize::Make(WIDTH, HEIGHT);
}
void onOnceBeforeDraw() override {
fBitmap = sk_tool_utils::create_string_bitmap(80, 80, 0xD000D000, 15, 65, 96, "e");
fCheckerboard.reset(SkImage::NewFromBitmap(
sk_tool_utils::create_checkerboard_bitmap(80, 80,
sk_tool_utils::color_to_565(0xFFA0A0A0),
sk_tool_utils::color_to_565(0xFF404040),
8)));
}
void onDraw(SkCanvas* canvas) override {
canvas->clear(SK_ColorBLACK);
SkPaint paint;
const struct {
SkXfermode::Mode fMode;
const char* fLabel;
} gModes[] = {
{ SkXfermode::kClear_Mode, "Clear" },
{ SkXfermode::kSrc_Mode, "Src" },
{ SkXfermode::kDst_Mode, "Dst" },
{ SkXfermode::kSrcOver_Mode, "SrcOver" },
{ SkXfermode::kDstOver_Mode, "DstOver" },
{ SkXfermode::kSrcIn_Mode, "SrcIn" },
{ SkXfermode::kDstIn_Mode, "DstIn" },
{ SkXfermode::kSrcOut_Mode, "SrcOut" },
{ SkXfermode::kDstOut_Mode, "DstOut" },
{ SkXfermode::kSrcATop_Mode, "SrcATop" },
{ SkXfermode::kDstATop_Mode, "DstATop" },
{ SkXfermode::kXor_Mode, "Xor" },
{ SkXfermode::kPlus_Mode, "Plus" },
{ SkXfermode::kModulate_Mode, "Modulate" },
{ SkXfermode::kScreen_Mode, "Screen" },
{ SkXfermode::kOverlay_Mode, "Overlay" },
{ SkXfermode::kDarken_Mode, "Darken" },
{ SkXfermode::kLighten_Mode, "Lighten" },
{ SkXfermode::kColorDodge_Mode, "ColorDodge" },
{ SkXfermode::kColorBurn_Mode, "ColorBurn" },
{ SkXfermode::kHardLight_Mode, "HardLight" },
{ SkXfermode::kSoftLight_Mode, "SoftLight" },
{ SkXfermode::kDifference_Mode, "Difference" },
{ SkXfermode::kExclusion_Mode, "Exclusion" },
{ SkXfermode::kMultiply_Mode, "Multiply" },
{ SkXfermode::kHue_Mode, "Hue" },
{ SkXfermode::kSaturation_Mode, "Saturation" },
{ SkXfermode::kColor_Mode, "Color" },
{ SkXfermode::kLuminosity_Mode, "Luminosity" },
};
int x = 0, y = 0;
SkAutoTUnref<SkImageFilter> background(SkImageSource::Create(fCheckerboard));
for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) {
SkAutoTUnref<SkXfermode> mode(SkXfermode::Create(gModes[i].fMode));
SkAutoTUnref<SkImageFilter> filter(SkXfermodeImageFilter::Create(mode, background));
paint.setImageFilter(filter);
DrawClippedBitmap(canvas, fBitmap, paint, x, y);
x += fBitmap.width() + MARGIN;
if (x + fBitmap.width() > WIDTH) {
x = 0;
y += fBitmap.height() + MARGIN;
}
}
// Test arithmetic mode as image filter
SkAutoTUnref<SkXfermode> mode(SkArithmeticMode::Create(0, SK_Scalar1, SK_Scalar1, 0));
SkAutoTUnref<SkImageFilter> filter(SkXfermodeImageFilter::Create(mode, background));
paint.setImageFilter(filter);
DrawClippedBitmap(canvas, fBitmap, paint, x, y);
x += fBitmap.width() + MARGIN;
if (x + fBitmap.width() > WIDTH) {
x = 0;
y += fBitmap.height() + MARGIN;
}
// Test nullptr mode
filter.reset(SkXfermodeImageFilter::Create(nullptr, background));
paint.setImageFilter(filter);
DrawClippedBitmap(canvas, fBitmap, paint, x, y);
x += fBitmap.width() + MARGIN;
if (x + fBitmap.width() > WIDTH) {
x = 0;
y += fBitmap.height() + MARGIN;
}
SkRect clipRect = SkRect::MakeWH(SkIntToScalar(fBitmap.width() + 4),
SkIntToScalar(fBitmap.height() + 4));
// Test offsets on SrcMode (uses fixed-function blend)
SkAutoTUnref<SkImage> bitmapImage(SkImage::NewFromBitmap(fBitmap));
SkAutoTUnref<SkImageFilter> foreground(SkImageSource::Create(bitmapImage));
SkAutoTUnref<SkImageFilter> offsetForeground(SkOffsetImageFilter::Create(
SkIntToScalar(4), SkIntToScalar(-4), foreground));
SkAutoTUnref<SkImageFilter> offsetBackground(SkOffsetImageFilter::Create(
SkIntToScalar(4), SkIntToScalar(4), background));
mode.reset(SkXfermode::Create(SkXfermode::kSrcOver_Mode));
filter.reset(SkXfermodeImageFilter::Create(mode, offsetBackground, offsetForeground));
paint.setImageFilter(filter);
DrawClippedPaint(canvas, clipRect, paint, x, y);
x += fBitmap.width() + MARGIN;
if (x + fBitmap.width() > WIDTH) {
x = 0;
y += fBitmap.height() + MARGIN;
}
// Test offsets on Darken (uses shader blend)
mode.reset(SkXfermode::Create(SkXfermode::kDarken_Mode));
filter.reset(SkXfermodeImageFilter::Create(mode, offsetBackground, offsetForeground));
paint.setImageFilter(filter);
DrawClippedPaint(canvas, clipRect, paint, x, y);
x += fBitmap.width() + MARGIN;
if (x + fBitmap.width() > WIDTH) {
x = 0;
y += fBitmap.height() + MARGIN;
}
// Test cropping
static const size_t nbSamples = 3;
SkXfermode::Mode sampledModes[nbSamples] = {SkXfermode::kOverlay_Mode,
SkXfermode::kSrcOver_Mode,
SkXfermode::kPlus_Mode};
int offsets[nbSamples][4] = {{ 10, 10, -16, -16},
{ 10, 10, 10, 10},
{-10, -10, -6, -6}};
for (size_t i = 0; i < nbSamples; ++i) {
SkIRect cropRect = SkIRect::MakeXYWH(offsets[i][0],
offsets[i][1],
fBitmap.width() + offsets[i][2],
fBitmap.height() + offsets[i][3]);
SkImageFilter::CropRect rect(SkRect::Make(cropRect));
mode.reset(SkXfermode::Create(sampledModes[i]));
filter.reset(SkXfermodeImageFilter::Create(
mode, offsetBackground, offsetForeground, &rect));
paint.setImageFilter(filter);
DrawClippedPaint(canvas, clipRect, paint, x, y);
x += fBitmap.width() + MARGIN;
if (x + fBitmap.width() > WIDTH) {
x = 0;
y += fBitmap.height() + MARGIN;
}
}
// Test small bg, large fg with Screen (uses shader blend)
mode.reset(SkXfermode::Create(SkXfermode::kScreen_Mode));
SkImageFilter::CropRect cropRect(SkRect::MakeXYWH(10, 10, 60, 60));
SkAutoTUnref<SkImageFilter> cropped(
SkOffsetImageFilter::Create(0, 0, foreground, &cropRect));
filter.reset(SkXfermodeImageFilter::Create(mode, cropped, background));
paint.setImageFilter(filter);
DrawClippedPaint(canvas, clipRect, paint, x, y);
x += fBitmap.width() + MARGIN;
if (x + fBitmap.width() > WIDTH) {
x = 0;
y += fBitmap.height() + MARGIN;
}
// Test small fg, large bg with Screen (uses shader blend)
filter.reset(SkXfermodeImageFilter::Create(mode, background, cropped));
paint.setImageFilter(filter);
DrawClippedPaint(canvas, clipRect, paint, x, y);
x += fBitmap.width() + MARGIN;
if (x + fBitmap.width() > WIDTH) {
x = 0;
y += fBitmap.height() + MARGIN;
}
}
private:
static void DrawClippedBitmap(SkCanvas* canvas, const SkBitmap& bitmap, const SkPaint& paint,
int x, int y) {
canvas->save();
canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
canvas->clipRect(SkRect::MakeWH(
SkIntToScalar(bitmap.width()), SkIntToScalar(bitmap.height())));
canvas->drawBitmap(bitmap, 0, 0, &paint);
canvas->restore();
}
static void DrawClippedPaint(SkCanvas* canvas, const SkRect& rect, const SkPaint& paint,
int x, int y) {
canvas->save();
canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
canvas->clipRect(rect);
canvas->drawPaint(paint);
canvas->restore();
}
SkBitmap fBitmap;
SkAutoTUnref<SkImage> fCheckerboard;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM( return new XfermodeImageFilterGM; );
}
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