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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/gm.h"
#include "include/core/SkBitmap.h"
#include "include/core/SkBlendMode.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkImage.h"
#include "include/core/SkImageFilter.h"
#include "include/core/SkPaint.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkTypes.h"
#include "include/effects/SkImageFilters.h"
#include "tools/ToolUtils.h"
#include "tools/fonts/FontToolUtils.h"
#include <utility>
#define WIDTH 600
#define HEIGHT 700
#define MARGIN 12
namespace skiagm {
class XfermodeImageFilterGM : public GM {
public:
XfermodeImageFilterGM(){
this->setBGColor(0xFF000000);
}
protected:
SkString getName() const override { return SkString("xfermodeimagefilter"); }
SkISize getISize() override { return SkISize::Make(WIDTH, HEIGHT); }
void onOnceBeforeDraw() override {
fBitmap = ToolUtils::CreateStringBitmap(80, 80, 0xD000D000, 15, 65, 96, "e");
fCheckerboard = ToolUtils::create_checkerboard_image(80, 80, 0xFFA0A0A0, 0xFF404040, 8);
}
void onDraw(SkCanvas* canvas) override {
canvas->clear(SK_ColorBLACK);
SkPaint paint;
const SkBlendMode gModes[] = {
SkBlendMode::kClear,
SkBlendMode::kSrc,
SkBlendMode::kDst,
SkBlendMode::kSrcOver,
SkBlendMode::kDstOver,
SkBlendMode::kSrcIn,
SkBlendMode::kDstIn,
SkBlendMode::kSrcOut,
SkBlendMode::kDstOut,
SkBlendMode::kSrcATop,
SkBlendMode::kDstATop,
SkBlendMode::kXor,
SkBlendMode::kPlus,
SkBlendMode::kModulate,
SkBlendMode::kScreen,
SkBlendMode::kOverlay,
SkBlendMode::kDarken,
SkBlendMode::kLighten,
SkBlendMode::kColorDodge,
SkBlendMode::kColorBurn,
SkBlendMode::kHardLight,
SkBlendMode::kSoftLight,
SkBlendMode::kDifference,
SkBlendMode::kExclusion,
SkBlendMode::kMultiply,
SkBlendMode::kHue,
SkBlendMode::kSaturation,
SkBlendMode::kColor,
SkBlendMode::kLuminosity,
};
int x = 0, y = 0;
sk_sp<SkImageFilter> background(SkImageFilters::Image(fCheckerboard,
SkFilterMode::kNearest));
for (size_t i = 0; i < std::size(gModes); i++) {
paint.setImageFilter(SkImageFilters::Blend(gModes[i], background));
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
paint.setImageFilter(SkImageFilters::Arithmetic(0, 1, 1, 0, true, background, nullptr));
DrawClippedBitmap(canvas, fBitmap, paint, x, y);
x += fBitmap.width() + MARGIN;
if (x + fBitmap.width() > WIDTH) {
x = 0;
y += fBitmap.height() + MARGIN;
}
// Test nullptr mode
paint.setImageFilter(SkImageFilters::Blend(SkBlendMode::kSrcOver, background));
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)
sk_sp<SkImage> bitmapImage(fBitmap.asImage());
sk_sp<SkImageFilter> foreground(SkImageFilters::Image(std::move(bitmapImage),
SkFilterMode::kNearest));
sk_sp<SkImageFilter> offsetForeground(SkImageFilters::Offset(4, -4, foreground));
sk_sp<SkImageFilter> offsetBackground(SkImageFilters::Offset(4, 4, background));
paint.setImageFilter(SkImageFilters::Blend(
SkBlendMode::kSrcOver, offsetBackground, offsetForeground));
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)
paint.setImageFilter(SkImageFilters::Blend(
SkBlendMode::kDarken, offsetBackground, offsetForeground));
DrawClippedPaint(canvas, clipRect, paint, x, y);
x += fBitmap.width() + MARGIN;
if (x + fBitmap.width() > WIDTH) {
x = 0;
y += fBitmap.height() + MARGIN;
}
// Test cropping
constexpr size_t nbSamples = 3;
const SkBlendMode sampledModes[nbSamples] = {
SkBlendMode::kOverlay, SkBlendMode::kSrcOver, SkBlendMode::kPlus
};
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]);
paint.setImageFilter(SkImageFilters::Blend(sampledModes[i], offsetBackground,
offsetForeground, &cropRect));
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)
SkIRect cropRect = SkIRect::MakeXYWH(10, 10, 60, 60);
sk_sp<SkImageFilter> cropped(SkImageFilters::Offset(0, 0, foreground, &cropRect));
paint.setImageFilter(SkImageFilters::Blend(SkBlendMode::kScreen, cropped, background));
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)
paint.setImageFilter(SkImageFilters::Blend(SkBlendMode::kScreen, background, cropped));
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 SrcIn with a crop that forces it to full size.
// This tests that SkXfermodeImageFilter correctly applies the compositing mode to
// the region outside the foreground.
SkIRect cropRectFull = SkIRect::MakeXYWH(0, 0, 80, 80);
paint.setImageFilter(SkImageFilters::Blend(SkBlendMode::kSrcIn, background, cropped,
&cropRectFull));
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->clipIRect(bitmap.bounds());
canvas->drawImage(bitmap.asImage(), 0, 0, SkSamplingOptions(), &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;
sk_sp<SkImage> fCheckerboard;
using INHERITED = GM;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM( return new XfermodeImageFilterGM; );
} // namespace skiagm