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/*
* Copyright 2017 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 "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkHighContrastFilter.h"
using InvertStyle = SkHighContrastConfig::InvertStyle;
static SkScalar kSize = 200;
static SkColor kColor1 = SkColorSetARGB(0xff, 0xff, 0xff, 0);
static SkColor kColor2 = SkColorSetARGB(0xff, 0x82, 0xff, 0);
static void draw_label(SkCanvas* canvas, const SkHighContrastConfig& config) {
char labelBuffer[256];
const char* invertStr =
(config.fInvertStyle == InvertStyle::kInvertBrightness ?
"InvBrightness" :
(config.fInvertStyle == InvertStyle::kInvertLightness ?
"InvLightness" : "NoInvert"));
snprintf(labelBuffer, sizeof(labelBuffer), "%s%s contrast=%.1f",
config.fGrayscale ? "Gray " : "",
invertStr,
config.fContrast);
SkPaint paint;
sk_tool_utils::set_portable_typeface(&paint);
paint.setTextSize(0.05f);
size_t len = strlen(labelBuffer);
SkScalar width = paint.measureText(labelBuffer, len);
canvas->drawText(labelBuffer, len, 0.5f - width / 2, 0.16f, paint);
}
static void draw_scene(SkCanvas* canvas, const SkHighContrastConfig& config) {
SkRect bounds = SkRect::MakeLTRB(0.0f, 0.0f, 1.0f, 1.0f);
SkPaint xferPaint;
xferPaint.setColorFilter(SkHighContrastFilter::Make(config));
canvas->saveLayer(&bounds, &xferPaint);
SkPaint paint;
bounds = SkRect::MakeLTRB(0.1f, 0.2f, 0.9f, 0.4f);
paint.setARGB(0xff, 0x66, 0x11, 0x11);
canvas->drawRect(bounds, paint);
paint.setARGB(0xff, 0xbb, 0x77, 0x77);
paint.setTextSize(0.15f);
canvas->drawString("A", 0.15f, 0.35f, paint);
bounds = SkRect::MakeLTRB(0.1f, 0.8f, 0.9f, 1.0f);
paint.setARGB(0xff, 0xcc, 0xcc, 0xff);
canvas->drawRect(bounds, paint);
paint.setARGB(0xff, 0x88, 0x88, 0xbb);
paint.setTextSize(0.15f);
canvas->drawString("Z", 0.75f, 0.95f, paint);
bounds = SkRect::MakeLTRB(0.1f, 0.4f, 0.9f, 0.6f);
SkPoint pts[] = { { 0, 0 }, { 1, 0 } };
SkColor colors[] = { SK_ColorWHITE, SK_ColorBLACK };
SkScalar pos[] = { 0.2f, 0.8f };
paint.setShader(SkGradientShader::MakeLinear(
pts, colors, pos,
SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode));
canvas->drawRect(bounds, paint);
bounds = SkRect::MakeLTRB(0.1f, 0.6f, 0.9f, 0.8f);
SkColor colors2[] = { SK_ColorGREEN, SK_ColorWHITE };
paint.setShader(SkGradientShader::MakeLinear(
pts, colors2, pos,
SK_ARRAY_COUNT(colors2), SkShader::kClamp_TileMode));
canvas->drawRect(bounds, paint);
canvas->restore();
}
class HighContrastFilterGM : public skiagm::GM {
public:
HighContrastFilterGM() {
SkColor g1Colors[] = { kColor1, SkColorSetA(kColor1, 0x20) };
SkColor g2Colors[] = { kColor2, SkColorSetA(kColor2, 0x20) };
SkPoint g1Points[] = { { 0, 0 }, { 0, 100 } };
SkPoint g2Points[] = { { 0, 0 }, { kSize, 0 } };
SkScalar pos[] = { 0.2f, 1.0f };
SkHighContrastConfig fConfig;
fFilter = SkHighContrastFilter::Make(fConfig);
fGr1 = SkGradientShader::MakeLinear(
g1Points, g1Colors, pos, SK_ARRAY_COUNT(g1Colors),
SkShader::kClamp_TileMode);
fGr2 = SkGradientShader::MakeLinear(
g2Points, g2Colors, pos, SK_ARRAY_COUNT(g2Colors),
SkShader::kClamp_TileMode);
}
protected:
SkString onShortName() override {
return SkString("highcontrastfilter");
}
SkISize onISize() override {
return SkISize::Make(600, 420);
}
void onDraw(SkCanvas* canvas) override {
SkHighContrastConfig configs[] = {
{ false, InvertStyle::kNoInvert, 0.0f },
{ false, InvertStyle::kInvertBrightness, 0.0f },
{ false, InvertStyle::kInvertLightness, 0.0f },
{ false, InvertStyle::kInvertLightness, 0.2f },
{ true, InvertStyle::kNoInvert, 0.0f },
{ true, InvertStyle::kInvertBrightness, 0.0f },
{ true, InvertStyle::kInvertLightness, 0.0f },
{ true, InvertStyle::kInvertLightness, 0.2f },
};
for (size_t i = 0; i < SK_ARRAY_COUNT(configs); ++i) {
SkScalar x = kSize * (i % 4);
SkScalar y = kSize * (i / 4);
canvas->save();
canvas->translate(x, y);
canvas->scale(kSize, kSize);
draw_scene(canvas, configs[i]);
draw_label(canvas, configs[i]);
canvas->restore();
}
}
private:
sk_sp<SkColorFilter> fFilter;
sk_sp<SkShader> fGr1, fGr2;
typedef skiagm::GM INHERITED;
};
DEF_GM(return new HighContrastFilterGM;)
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