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/*
* Copyright 2012 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 "SkColorFilter.h"
#include "SkGradientShader.h"
#define WIDTH 512
#define HEIGHT 1024
namespace skiagm {
// Using gradients because GPU doesn't currently have an implementation of SkColorShader (duh!)
static sk_sp<SkShader> make_color_shader(SkColor color) {
constexpr SkPoint kPts[] = {{0, 0}, {1, 1}};
SkColor colors[] = {color, color};
return SkGradientShader::MakeLinear(kPts, colors, nullptr, 2, SkShader::kClamp_TileMode);
}
static sk_sp<SkShader> make_solid_shader() {
return make_color_shader(SkColorSetARGB(0xFF, 0x42, 0x82, 0x21));
}
static sk_sp<SkShader> make_transparent_shader() {
return make_color_shader(SkColorSetARGB(0x80, 0x10, 0x70, 0x20));
}
static sk_sp<SkShader> make_trans_black_shader() {
return make_color_shader(0x0);
}
// draws a background behind each test rect to see transparency
static sk_sp<SkShader> make_bg_shader(int checkSize) {
SkBitmap bmp;
bmp.allocN32Pixels(2 * checkSize, 2 * checkSize);
SkCanvas canvas(bmp);
canvas.clear(sk_tool_utils::color_to_565(0xFF800000));
SkPaint paint;
paint.setColor(sk_tool_utils::color_to_565(0xFF000080));
SkRect rect0 = SkRect::MakeXYWH(0, 0,
SkIntToScalar(checkSize), SkIntToScalar(checkSize));
SkRect rect1 = SkRect::MakeXYWH(SkIntToScalar(checkSize), SkIntToScalar(checkSize),
SkIntToScalar(checkSize), SkIntToScalar(checkSize));
canvas.drawRect(rect1, paint);
canvas.drawRect(rect0, paint);
return SkShader::MakeBitmapShader(bmp, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode);
}
class ModeColorFilterGM : public GM {
public:
ModeColorFilterGM() {
this->setBGColor(sk_tool_utils::color_to_565(0xFF303030));
}
protected:
SkString onShortName() override {
return SkString("modecolorfilters");
}
SkISize onISize() override {
return SkISize::Make(WIDTH, HEIGHT);
}
void onDraw(SkCanvas* canvas) override {
// size of rect for each test case
constexpr int kRectWidth = 20;
constexpr int kRectHeight = 20;
constexpr int kCheckSize = 10;
if (!fBmpShader) {
fBmpShader = make_bg_shader(kCheckSize);
}
SkPaint bgPaint;
bgPaint.setShader(fBmpShader);
bgPaint.setBlendMode(SkBlendMode::kSrc);
sk_sp<SkShader> shaders[] = {
nullptr, // use a paint color instead of a shader
make_solid_shader(),
make_transparent_shader(),
make_trans_black_shader(),
};
// used without shader
SkColor colors[] = {
SkColorSetARGB(0xFF, 0xFF, 0xFF, 0xFF),
SkColorSetARGB(0xFF, 0x00, 0x00, 0x00),
SkColorSetARGB(0x00, 0x00, 0x00, 0x00),
SkColorSetARGB(0xFF, 0x10, 0x20, 0x42),
SkColorSetARGB(0xA0, 0x20, 0x30, 0x90),
};
// used with shaders
SkColor alphas[] = {0xFFFFFFFF, 0x80808080};
const SkBlendMode modes[] = { // currently just doing the Modes expressible as Coeffs
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,
};
SkPaint paint;
int idx = 0;
const int kRectsPerRow = SkMax32(this->getISize().fWidth / kRectWidth, 1);
for (size_t cfm = 0; cfm < SK_ARRAY_COUNT(modes); ++cfm) {
for (size_t cfc = 0; cfc < SK_ARRAY_COUNT(colors); ++cfc) {
paint.setColorFilter(SkColorFilter::MakeModeFilter(colors[cfc], modes[cfm]));
for (size_t s = 0; s < SK_ARRAY_COUNT(shaders); ++s) {
paint.setShader(shaders[s]);
bool hasShader = nullptr == paint.getShader();
int paintColorCnt = hasShader ? SK_ARRAY_COUNT(alphas) : SK_ARRAY_COUNT(colors);
SkColor* paintColors = hasShader ? alphas : colors;
for (int pc = 0; pc < paintColorCnt; ++pc) {
paint.setColor(paintColors[pc]);
SkScalar x = SkIntToScalar(idx % kRectsPerRow);
SkScalar y = SkIntToScalar(idx / kRectsPerRow);
SkRect rect = SkRect::MakeXYWH(x * kRectWidth, y * kRectHeight,
SkIntToScalar(kRectWidth),
SkIntToScalar(kRectHeight));
canvas->saveLayer(&rect, nullptr);
canvas->drawRect(rect, bgPaint);
canvas->drawRect(rect, paint);
canvas->restore();
++idx;
}
}
}
}
}
private:
sk_sp<SkShader> fBmpShader;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static GM* MyFactory(void*) { return new ModeColorFilterGM; }
static GMRegistry reg(MyFactory);
}
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