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skia2/gm/xfermodeimagefilter.cpp

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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 "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 = SkImage::MakeFromBitmap(
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 {
SkBlendMode fMode;
const char* fLabel;
} gModes[] = {
{ SkBlendMode::kClear, "Clear" },
{ SkBlendMode::kSrc, "Src" },
{ SkBlendMode::kDst, "Dst" },
{ SkBlendMode::kSrcOver, "SrcOver" },
{ SkBlendMode::kDstOver, "DstOver" },
{ SkBlendMode::kSrcIn, "SrcIn" },
{ SkBlendMode::kDstIn, "DstIn" },
{ SkBlendMode::kSrcOut, "SrcOut" },
{ SkBlendMode::kDstOut, "DstOut" },
{ SkBlendMode::kSrcATop, "SrcATop" },
{ SkBlendMode::kDstATop, "DstATop" },
{ SkBlendMode::kXor, "Xor" },
{ SkBlendMode::kPlus, "Plus" },
{ SkBlendMode::kModulate, "Modulate" },
{ SkBlendMode::kScreen, "Screen" },
{ SkBlendMode::kOverlay, "Overlay" },
{ SkBlendMode::kDarken, "Darken" },
{ SkBlendMode::kLighten, "Lighten" },
{ SkBlendMode::kColorDodge, "ColorDodge" },
{ SkBlendMode::kColorBurn, "ColorBurn" },
{ SkBlendMode::kHardLight, "HardLight" },
{ SkBlendMode::kSoftLight, "SoftLight" },
{ SkBlendMode::kDifference, "Difference" },
{ SkBlendMode::kExclusion, "Exclusion" },
{ SkBlendMode::kMultiply, "Multiply" },
{ SkBlendMode::kHue, "Hue" },
{ SkBlendMode::kSaturation, "Saturation" },
{ SkBlendMode::kColor, "Color" },
{ SkBlendMode::kLuminosity, "Luminosity" },
};
int x = 0, y = 0;
sk_sp<SkImageFilter> background(SkImageSource::Make(fCheckerboard));
for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) {
paint.setImageFilter(SkXfermodeImageFilter::Make(gModes[i].fMode, 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(SkXfermodeImageFilter::MakeArithmetic(0, 1, 1, 0, true, background));
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(SkXfermodeImageFilter::Make(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(SkImage::MakeFromBitmap(fBitmap));
sk_sp<SkImageFilter> foreground(SkImageSource::Make(std::move(bitmapImage)));
sk_sp<SkImageFilter> offsetForeground(SkOffsetImageFilter::Make(SkIntToScalar(4),
SkIntToScalar(-4),
foreground));
sk_sp<SkImageFilter> offsetBackground(SkOffsetImageFilter::Make(SkIntToScalar(4),
SkIntToScalar(4),
background));
paint.setImageFilter(SkXfermodeImageFilter::Make(SkBlendMode::kSrcOver,
offsetBackground,
offsetForeground,
nullptr));
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(SkXfermodeImageFilter::Make(SkBlendMode::kDarken,
offsetBackground,
offsetForeground,
nullptr));
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]);
SkImageFilter::CropRect rect(SkRect::Make(cropRect));
paint.setImageFilter(SkXfermodeImageFilter::Make(sampledModes[i],
offsetBackground,
offsetForeground,
&rect));
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)
SkBlendMode mode = SkBlendMode::kScreen;
SkImageFilter::CropRect cropRect(SkRect::MakeXYWH(10, 10, 60, 60));
sk_sp<SkImageFilter> cropped(SkOffsetImageFilter::Make(0, 0, foreground, &cropRect));
paint.setImageFilter(SkXfermodeImageFilter::Make(mode, cropped, background, nullptr));
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(SkXfermodeImageFilter::Make(mode, background, cropped, nullptr));
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.
mode = SkBlendMode::kSrcIn;
SkImageFilter::CropRect cropRectFull(SkRect::MakeXYWH(0, 0, 80, 80));
paint.setImageFilter(SkXfermodeImageFilter::Make(mode, 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->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;
sk_sp<SkImage> fCheckerboard;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM( return new XfermodeImageFilterGM; );
}
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