blob: 6d6e1a0bf256050df29a814377a4d67c9ceaaf02 [file] [log] [blame]
/*
* 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/gm.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkColorFilter.h"
#include "include/core/SkFont.h"
#include "include/core/SkFontMetrics.h"
#include "include/core/SkFontTypes.h"
#include "include/core/SkImageFilter.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/SkTypeface.h"
#include "include/core/SkTypes.h"
#include "include/effects/SkGradientShader.h"
#include "include/effects/SkImageFilters.h"
#include "tools/ToolUtils.h"
#include <string.h>
#include <initializer_list>
#include <utility>
/*
* Spits out an arbitrary 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, std::size(kColors),
SkTileMode::kClamp);
}
static sk_sp<SkImageFilter> make_grayscale(sk_sp<SkImageFilter> input) {
float matrix[20];
memset(matrix, 0, 20 * sizeof(float));
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(SkColorFilters::Matrix(matrix));
return SkImageFilters::ColorFilter(std::move(filter), std::move(input));
}
static sk_sp<SkImageFilter> make_blur(float amount, sk_sp<SkImageFilter> input) {
return SkImageFilters::Blur(amount, amount, std::move(input));
}
static sk_sp<SkColorFilter> make_color_filter() {
return SkColorFilters::Lighting(SkColorSetRGB(0x00, 0x80, 0xFF),
SkColorSetRGB(0xFF, 0x20, 0x00));
}
namespace skiagm {
class ColorEmojiGM : public GM {
public:
ColorEmojiGM() { }
protected:
struct EmojiFont {
sk_sp<SkTypeface> typeface;
const char* text;
} emojiFont;
void onOnceBeforeDraw() override {
emojiFont.typeface = ToolUtils::emoji_typeface();
emojiFont.text = ToolUtils::emoji_sample_text();
}
SkString onShortName() override {
return SkString("coloremoji");
}
SkISize onISize() override { return SkISize::Make(650, 1200); }
void onDraw(SkCanvas* canvas) override {
canvas->drawColor(SK_ColorGRAY);
SkFont font(emojiFont.typeface);
char const * const text = emojiFont.text;
size_t textLen = strlen(text);
// draw text at different point sizes
constexpr SkScalar textSizes[] = { 10, 30, 50, };
SkFontMetrics metrics;
SkScalar y = 0;
for (const bool& fakeBold : { false, true }) {
font.setEmbolden(fakeBold);
for (const SkScalar& textSize : textSizes) {
font.setSize(textSize);
font.getMetrics(&metrics);
y += -metrics.fAscent;
canvas->drawSimpleText(text, textLen, SkTextEncoding::kUTF8,
10, y, font, SkPaint());
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++) {
for (int makeMode = 0; makeMode < 2; ++makeMode) {
for (int alpha = 0; alpha < 2; ++alpha) {
SkFont shaderFont(font.refTypefaceOrDefault());
SkPaint shaderPaint;
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));
}
if (makeMode) {
shaderPaint.setColorFilter(make_color_filter());
}
if (alpha) {
shaderPaint.setAlphaf(0.5f);
}
shaderFont.setSize(30);
shaderFont.getMetrics(&metrics);
y += -metrics.fAscent;
canvas->drawSimpleText(text, textLen, SkTextEncoding::kUTF8, 380, y,
shaderFont, shaderPaint);
y += metrics.fDescent + metrics.fLeading;
}
}
}
}
}
// setup work needed to draw text with different clips
canvas->translate(10, savedY);
font.setSize(40);
// compute the bounds of the text
SkRect bounds;
font.measureText(text, textLen, SkTextEncoding::kUTF8, &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);
SkPaint paint;
for (const SkRect& clipRect : clipRects) {
canvas->translate(0, bounds.height());
canvas->save();
canvas->drawRect(clipRect, clipHairline);
paint.setAlpha(0x20);
canvas->drawSimpleText(text, textLen, SkTextEncoding::kUTF8, 0, 0, font, paint);
canvas->clipRect(clipRect);
paint.setAlphaf(1.0f);
canvas->drawSimpleText(text, textLen, SkTextEncoding::kUTF8, 0, 0, font, paint);
canvas->restore();
canvas->translate(0, SkIntToScalar(25));
}
}
using INHERITED = GM;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new ColorEmojiGM;)
} // namespace skiagm