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/*
* Copyright 2011 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 "SkColorMatrixFilter.h"
#include "SkGradientShader.h"
#include "SkImage.h"
#define WIDTH 500
#define HEIGHT 500
static void set_color_matrix(SkPaint* paint, const SkColorMatrix& matrix) {
paint->setColorFilter(SkColorFilter::MakeMatrixFilterRowMajor255(matrix.fMat));
}
static void set_array(SkPaint* paint, const SkScalar array[]) {
paint->setColorFilter(SkColorFilter::MakeMatrixFilterRowMajor255(array));
}
class ColorMatrixGM : public skiagm::GM {
public:
ColorMatrixGM() {
this->setBGColor(sk_tool_utils::color_to_565(0xFF808080));
}
protected:
SkString onShortName() override {
return SkString("colormatrix");
}
SkISize onISize() override {
return SkISize::Make(WIDTH, HEIGHT);
}
void onOnceBeforeDraw() override {
fSolidImg = CreateSolidBitmap(64, 64);
fTransparentImg = CreateTransparentBitmap(64, 64);
}
static sk_sp<SkImage> CreateSolidBitmap(int width, int height) {
SkBitmap bm;
bm.allocN32Pixels(width, height);
SkCanvas canvas(bm);
canvas.clear(0x0);
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; ++x) {
SkPaint paint;
paint.setColor(SkColorSetARGB(255, x * 255 / width, y * 255 / height, 0));
canvas.drawRect(SkRect::MakeXYWH(SkIntToScalar(x),
SkIntToScalar(y), SK_Scalar1, SK_Scalar1), paint);
}
}
return SkImage::MakeFromBitmap(bm);
}
// creates a bitmap with shades of transparent gray.
static sk_sp<SkImage> CreateTransparentBitmap(int width, int height) {
SkBitmap bm;
bm.allocN32Pixels(width, height);
SkCanvas canvas(bm);
canvas.clear(0x0);
SkPoint pts[] = {{0, 0}, {SkIntToScalar(width), SkIntToScalar(height)}};
SkColor colors[] = {0x00000000, 0xFFFFFFFF};
SkPaint paint;
paint.setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, 2,
SkShader::kClamp_TileMode));
canvas.drawRect(SkRect::MakeWH(SkIntToScalar(width), SkIntToScalar(height)), paint);
return SkImage::MakeFromBitmap(bm);
}
void onDraw(SkCanvas* canvas) override {
SkPaint paint;
SkColorMatrix matrix;
paint.setBlendMode(SkBlendMode::kSrc);
const SkImage* bmps[] = { fSolidImg.get(), fTransparentImg.get() };
for (size_t i = 0; i < SK_ARRAY_COUNT(bmps); ++i) {
matrix.setIdentity();
set_color_matrix(&paint, matrix);
canvas->drawImage(bmps[i], 0, 0, &paint);
matrix.setRotate(SkColorMatrix::kR_Axis, 90);
set_color_matrix(&paint, matrix);
canvas->drawImage(bmps[i], 80, 0, &paint);
matrix.setRotate(SkColorMatrix::kG_Axis, 90);
set_color_matrix(&paint, matrix);
canvas->drawImage(bmps[i], 160, 0, &paint);
matrix.setRotate(SkColorMatrix::kB_Axis, 90);
set_color_matrix(&paint, matrix);
canvas->drawImage(bmps[i], 240, 0, &paint);
///////////////////////////////////////////////
matrix.setSaturation(0.0f);
set_color_matrix(&paint, matrix);
canvas->drawImage(bmps[i], 0, 80, &paint);
matrix.setSaturation(0.5f);
set_color_matrix(&paint, matrix);
canvas->drawImage(bmps[i], 80, 80, &paint);
matrix.setSaturation(1.0f);
set_color_matrix(&paint, matrix);
canvas->drawImage(bmps[i], 160, 80, &paint);
matrix.setSaturation(2.0f);
set_color_matrix(&paint, matrix);
canvas->drawImage(bmps[i], 240, 80, &paint);
///////////////////////////////////////////////
matrix.setRGB2YUV();
set_color_matrix(&paint, matrix);
canvas->drawImage(bmps[i], 0, 160, &paint);
matrix.setYUV2RGB();
set_color_matrix(&paint, matrix);
canvas->drawImage(bmps[i], 80, 160, &paint);
SkScalar s1 = SK_Scalar1;
SkScalar s255 = SkIntToScalar(255);
// Move red into alpha, set color to white
SkScalar data[20] = {
0, 0, 0, 0, s255,
0, 0, 0, 0, s255,
0, 0, 0, 0, s255,
s1, 0, 0, 0, 0,
};
set_array(&paint, data);
canvas->drawImage(bmps[i], 160, 160, &paint);
///////////////////////////////////////////////
canvas->translate(0, 240);
}
}
private:
sk_sp<SkImage> fSolidImg;
sk_sp<SkImage> fTransparentImg;
typedef skiagm::GM INHERITED;
};
DEF_GM( return new ColorMatrixGM; )
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