blob: c49c6be1654ff7be59b07fcb9bf7131e462eb254 [file] [log] [blame]
/*
* 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/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/SkColorFilter.h"
#include "include/core/SkImage.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkShader.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkTileMode.h"
#include "include/core/SkTypes.h"
#include "include/effects/SkColorMatrix.h"
#include "include/effects/SkGradientShader.h"
#define WIDTH 500
#define HEIGHT 160
static void set_color_matrix(SkPaint* paint, const SkColorMatrix& matrix) {
paint->setColorFilter(SkColorFilters::Matrix(matrix));
}
static void set_array(SkPaint* paint, const float array[]) {
paint->setColorFilter(SkColorFilters::Matrix(array));
}
class ColorMatrixGM : public skiagm::GM {
public:
ColorMatrixGM() {
this->setBGColor(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 bm.asImage();
}
// 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,
SkTileMode::kClamp));
canvas.drawRect(SkRect::MakeWH(SkIntToScalar(width), SkIntToScalar(height)), paint);
return bm.asImage();
}
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 < std::size(bmps); ++i) {
matrix.setIdentity();
set_color_matrix(&paint, matrix);
canvas->drawImage(bmps[i], 0, 0, SkSamplingOptions(), &paint);
///////////////////////////////////////////////
matrix.setSaturation(0.0f);
set_color_matrix(&paint, matrix);
canvas->drawImage(bmps[i], 80, 0, SkSamplingOptions(), &paint);
matrix.setSaturation(0.5f);
set_color_matrix(&paint, matrix);
canvas->drawImage(bmps[i], 160, 0, SkSamplingOptions(), &paint);
matrix.setSaturation(1.0f);
set_color_matrix(&paint, matrix);
canvas->drawImage(bmps[i], 240, 0, SkSamplingOptions(), &paint);
matrix.setSaturation(2.0f);
set_color_matrix(&paint, matrix);
canvas->drawImage(bmps[i], 320, 0, SkSamplingOptions(), &paint);
///////////////////////////////////////////////
// Move red into alpha, set color to white
float data[20] = {
0, 0, 0, 0, 1,
0, 0, 0, 0, 1,
0, 0, 0, 0, 1,
1, 0, 0, 0, 0,
};
set_array(&paint, data);
canvas->drawImage(bmps[i], 400, 0, SkSamplingOptions(), &paint);
///////////////////////////////////////////////
canvas->translate(0, 80);
}
}
private:
sk_sp<SkImage> fSolidImg;
sk_sp<SkImage> fTransparentImg;
using INHERITED = skiagm::GM;
};
DEF_GM( return new ColorMatrixGM; )