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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 "Resources.h"
#include "SkBlurImageFilter.h"
#include "SkColorFilterImageFilter.h"
#include "SkColorMatrixFilter.h"
#include "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkStream.h"
#include "SkTypeface.h"
/*
* Spits out a dummy gradient to test blur with shader on paint
*/
static sk_sp<SkShader> MakeLinear() {
constexpr SkPoint kPts[] = { { 0, 0 }, { 32, 32 } };
constexpr SkScalar kPos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
constexpr SkColor kColors[] = {0x80F00080, 0xF0F08000, 0x800080F0 };
return SkGradientShader::MakeLinear(kPts, kColors, kPos, SK_ARRAY_COUNT(kColors),
SkShader::kClamp_TileMode);
}
static sk_sp<SkImageFilter> make_grayscale(sk_sp<SkImageFilter> input) {
SkScalar matrix[20];
memset(matrix, 0, 20 * sizeof(SkScalar));
matrix[0] = matrix[5] = matrix[10] = 0.2126f;
matrix[1] = matrix[6] = matrix[11] = 0.7152f;
matrix[2] = matrix[7] = matrix[12] = 0.0722f;
matrix[18] = 1.0f;
sk_sp<SkColorFilter> filter(SkColorFilter::MakeMatrixFilterRowMajor255(matrix));
return SkColorFilterImageFilter::Make(std::move(filter), std::move(input));
}
static sk_sp<SkImageFilter> make_blur(float amount, sk_sp<SkImageFilter> input) {
return SkBlurImageFilter::Make(amount, amount, std::move(input));
}
namespace skiagm {
class ColorEmojiGM : public GM {
public:
ColorEmojiGM() { }
protected:
struct EmojiFont {
sk_sp<SkTypeface> typeface;
const char* text;
} emojiFont;
virtual void onOnceBeforeDraw() override {
emojiFont.typeface = sk_tool_utils::emoji_typeface();
emojiFont.text = sk_tool_utils::emoji_sample_text();
}
SkString onShortName() override {
SkString name("coloremoji");
name.append(sk_tool_utils::platform_os_emoji());
return name;
}
SkISize onISize() override {
return SkISize::Make(650, 900);
}
void onDraw(SkCanvas* canvas) override {
canvas->drawColor(sk_tool_utils::color_to_565(SK_ColorGRAY));
SkPaint paint;
paint.setTypeface(emojiFont.typeface);
const char* text = emojiFont.text;
// draw text at different point sizes
constexpr SkScalar textSizes[] = { 10, 30, 50, };
SkPaint::FontMetrics metrics;
SkScalar y = 0;
for (const SkScalar& textSize : textSizes) {
paint.setTextSize(textSize);
paint.getFontMetrics(&metrics);
y += -metrics.fAscent;
canvas->drawText(text, strlen(text), 10, y, paint);
y += metrics.fDescent + metrics.fLeading;
}
y += 20;
SkScalar savedY = y;
// draw with shaders and image filters
for (int makeLinear = 0; makeLinear < 2; makeLinear++) {
for (int makeBlur = 0; makeBlur < 2; makeBlur++) {
for (int makeGray = 0; makeGray < 2; makeGray++) {
SkPaint shaderPaint;
shaderPaint.setTypeface(sk_ref_sp(paint.getTypeface()));
if (SkToBool(makeLinear)) {
shaderPaint.setShader(MakeLinear());
}
if (SkToBool(makeBlur) && SkToBool(makeGray)) {
sk_sp<SkImageFilter> grayScale(make_grayscale(nullptr));
sk_sp<SkImageFilter> blur(make_blur(3.0f, std::move(grayScale)));
shaderPaint.setImageFilter(std::move(blur));
} else if (SkToBool(makeBlur)) {
shaderPaint.setImageFilter(make_blur(3.0f, nullptr));
} else if (SkToBool(makeGray)) {
shaderPaint.setImageFilter(make_grayscale(nullptr));
}
shaderPaint.setTextSize(30);
shaderPaint.getFontMetrics(&metrics);
y += -metrics.fAscent;
canvas->drawText(text, strlen(text), 380, y, shaderPaint);
y += metrics.fDescent + metrics.fLeading;
}
}
}
// setup work needed to draw text with different clips
canvas->translate(10, savedY);
paint.setTextSize(40);
// compute the bounds of the text
SkRect bounds;
paint.measureText(text, strlen(text), &bounds);
const SkScalar boundsHalfWidth = bounds.width() * SK_ScalarHalf;
const SkScalar boundsHalfHeight = bounds.height() * SK_ScalarHalf;
const SkScalar boundsQuarterWidth = boundsHalfWidth * SK_ScalarHalf;
const SkScalar boundsQuarterHeight = boundsHalfHeight * SK_ScalarHalf;
SkRect upperLeftClip = SkRect::MakeXYWH(bounds.left(), bounds.top(),
boundsHalfWidth, boundsHalfHeight);
SkRect lowerRightClip = SkRect::MakeXYWH(bounds.centerX(), bounds.centerY(),
boundsHalfWidth, boundsHalfHeight);
SkRect interiorClip = bounds;
interiorClip.inset(boundsQuarterWidth, boundsQuarterHeight);
const SkRect clipRects[] = { bounds, upperLeftClip, lowerRightClip, interiorClip };
SkPaint clipHairline;
clipHairline.setColor(SK_ColorWHITE);
clipHairline.setStyle(SkPaint::kStroke_Style);
for (const SkRect& clipRect : clipRects) {
canvas->translate(0, bounds.height());
canvas->save();
canvas->drawRect(clipRect, clipHairline);
paint.setAlpha(0x20);
canvas->drawText(text, strlen(text), 0, 0, paint);
canvas->clipRect(clipRect);
paint.setAlpha(0xFF);
canvas->drawText(text, strlen(text), 0, 0, paint);
canvas->restore();
canvas->translate(0, SkIntToScalar(25));
}
}
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new ColorEmojiGM;)
}
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