1 /*
2 * Copyright 2013 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "gm/gm.h"
9 #include "include/core/SkCanvas.h"
10 #include "include/core/SkColor.h"
11 #include "include/core/SkColorFilter.h"
12 #include "include/core/SkFont.h"
13 #include "include/core/SkFontMetrics.h"
14 #include "include/core/SkFontTypes.h"
15 #include "include/core/SkImageFilter.h"
16 #include "include/core/SkPaint.h"
17 #include "include/core/SkPoint.h"
18 #include "include/core/SkRect.h"
19 #include "include/core/SkRefCnt.h"
20 #include "include/core/SkScalar.h"
21 #include "include/core/SkShader.h"
22 #include "include/core/SkSize.h"
23 #include "include/core/SkString.h"
24 #include "include/core/SkTileMode.h"
25 #include "include/core/SkTypeface.h"
26 #include "include/core/SkTypes.h"
27 #include "include/effects/SkColorMatrixFilter.h"
28 #include "include/effects/SkGradientShader.h"
29 #include "include/effects/SkImageFilters.h"
30 #include "tools/ToolUtils.h"
31
32 #include <string.h>
33 #include <initializer_list>
34 #include <utility>
35
36 /*
37 * Spits out an arbitrary gradient to test blur with shader on paint
38 */
MakeLinear()39 static sk_sp<SkShader> MakeLinear() {
40 constexpr SkPoint kPts[] = { { 0, 0 }, { 32, 32 } };
41 constexpr SkScalar kPos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
42 constexpr SkColor kColors[] = {0x80F00080, 0xF0F08000, 0x800080F0 };
43 return SkGradientShader::MakeLinear(kPts, kColors, kPos, SK_ARRAY_COUNT(kColors),
44 SkTileMode::kClamp);
45 }
46
make_grayscale(sk_sp<SkImageFilter> input)47 static sk_sp<SkImageFilter> make_grayscale(sk_sp<SkImageFilter> input) {
48 float matrix[20];
49 memset(matrix, 0, 20 * sizeof(float));
50 matrix[0] = matrix[5] = matrix[10] = 0.2126f;
51 matrix[1] = matrix[6] = matrix[11] = 0.7152f;
52 matrix[2] = matrix[7] = matrix[12] = 0.0722f;
53 matrix[18] = 1.0f;
54 sk_sp<SkColorFilter> filter(SkColorFilters::Matrix(matrix));
55 return SkImageFilters::ColorFilter(std::move(filter), std::move(input));
56 }
57
make_blur(float amount,sk_sp<SkImageFilter> input)58 static sk_sp<SkImageFilter> make_blur(float amount, sk_sp<SkImageFilter> input) {
59 return SkImageFilters::Blur(amount, amount, std::move(input));
60 }
61
make_color_filter()62 static sk_sp<SkColorFilter> make_color_filter() {
63 return SkColorMatrixFilter::MakeLightingFilter(SkColorSetRGB(0x00, 0x80, 0xFF),
64 SkColorSetRGB(0xFF, 0x20, 0x00));
65 }
66
67 namespace skiagm {
68
69 class ColorEmojiGM : public GM {
70 public:
ColorEmojiGM()71 ColorEmojiGM() { }
72
73 protected:
74 struct EmojiFont {
75 sk_sp<SkTypeface> typeface;
76 const char* text;
77 } emojiFont;
onOnceBeforeDraw()78 void onOnceBeforeDraw() override {
79 emojiFont.typeface = ToolUtils::emoji_typeface();
80 emojiFont.text = ToolUtils::emoji_sample_text();
81 }
82
onShortName()83 SkString onShortName() override {
84 return SkString("coloremoji");
85 }
86
onISize()87 SkISize onISize() override { return SkISize::Make(650, 1200); }
88
onDraw(SkCanvas * canvas)89 void onDraw(SkCanvas* canvas) override {
90
91 canvas->drawColor(SK_ColorGRAY);
92
93 SkFont font(emojiFont.typeface);
94 char const * const text = emojiFont.text;
95 size_t textLen = strlen(text);
96
97 // draw text at different point sizes
98 constexpr SkScalar textSizes[] = { 10, 30, 50, };
99 SkFontMetrics metrics;
100 SkScalar y = 0;
101 for (const bool& fakeBold : { false, true }) {
102 font.setEmbolden(fakeBold);
103 for (const SkScalar& textSize : textSizes) {
104 font.setSize(textSize);
105 font.getMetrics(&metrics);
106 y += -metrics.fAscent;
107 canvas->drawSimpleText(text, textLen, SkTextEncoding::kUTF8,
108 10, y, font, SkPaint());
109 y += metrics.fDescent + metrics.fLeading;
110 }
111 }
112
113 y += 20;
114 SkScalar savedY = y;
115 // draw with shaders and image filters
116 for (int makeLinear = 0; makeLinear < 2; makeLinear++) {
117 for (int makeBlur = 0; makeBlur < 2; makeBlur++) {
118 for (int makeGray = 0; makeGray < 2; makeGray++) {
119 for (int makeMode = 0; makeMode < 2; ++makeMode) {
120 for (int alpha = 0; alpha < 2; ++alpha) {
121 SkFont shaderFont(font.refTypefaceOrDefault());
122 SkPaint shaderPaint;
123 if (SkToBool(makeLinear)) {
124 shaderPaint.setShader(MakeLinear());
125 }
126
127 if (SkToBool(makeBlur) && SkToBool(makeGray)) {
128 sk_sp<SkImageFilter> grayScale(make_grayscale(nullptr));
129 sk_sp<SkImageFilter> blur(make_blur(3.0f, std::move(grayScale)));
130 shaderPaint.setImageFilter(std::move(blur));
131 } else if (SkToBool(makeBlur)) {
132 shaderPaint.setImageFilter(make_blur(3.0f, nullptr));
133 } else if (SkToBool(makeGray)) {
134 shaderPaint.setImageFilter(make_grayscale(nullptr));
135 }
136 if (makeMode) {
137 shaderPaint.setColorFilter(make_color_filter());
138 }
139 if (alpha) {
140 shaderPaint.setAlphaf(0.5f);
141 }
142 shaderFont.setSize(30);
143 shaderFont.getMetrics(&metrics);
144 y += -metrics.fAscent;
145 canvas->drawSimpleText(text, textLen, SkTextEncoding::kUTF8, 380, y,
146 shaderFont, shaderPaint);
147 y += metrics.fDescent + metrics.fLeading;
148 }
149 }
150 }
151 }
152 }
153 // setup work needed to draw text with different clips
154 canvas->translate(10, savedY);
155 font.setSize(40);
156
157 // compute the bounds of the text
158 SkRect bounds;
159 font.measureText(text, textLen, SkTextEncoding::kUTF8, &bounds);
160
161 const SkScalar boundsHalfWidth = bounds.width() * SK_ScalarHalf;
162 const SkScalar boundsHalfHeight = bounds.height() * SK_ScalarHalf;
163 const SkScalar boundsQuarterWidth = boundsHalfWidth * SK_ScalarHalf;
164 const SkScalar boundsQuarterHeight = boundsHalfHeight * SK_ScalarHalf;
165
166 SkRect upperLeftClip = SkRect::MakeXYWH(bounds.left(), bounds.top(),
167 boundsHalfWidth, boundsHalfHeight);
168 SkRect lowerRightClip = SkRect::MakeXYWH(bounds.centerX(), bounds.centerY(),
169 boundsHalfWidth, boundsHalfHeight);
170 SkRect interiorClip = bounds;
171 interiorClip.inset(boundsQuarterWidth, boundsQuarterHeight);
172
173 const SkRect clipRects[] = { bounds, upperLeftClip, lowerRightClip, interiorClip };
174
175 SkPaint clipHairline;
176 clipHairline.setColor(SK_ColorWHITE);
177 clipHairline.setStyle(SkPaint::kStroke_Style);
178
179 SkPaint paint;
180 for (const SkRect& clipRect : clipRects) {
181 canvas->translate(0, bounds.height());
182 canvas->save();
183 canvas->drawRect(clipRect, clipHairline);
184 paint.setAlpha(0x20);
185 canvas->drawSimpleText(text, textLen, SkTextEncoding::kUTF8, 0, 0, font, paint);
186 canvas->clipRect(clipRect);
187 paint.setAlphaf(1.0f);
188 canvas->drawSimpleText(text, textLen, SkTextEncoding::kUTF8, 0, 0, font, paint);
189 canvas->restore();
190 canvas->translate(0, SkIntToScalar(25));
191 }
192 }
193
194 using INHERITED = GM;
195 };
196
197 //////////////////////////////////////////////////////////////////////////////
198
199 DEF_GM(return new ColorEmojiGM;)
200
201 } // namespace skiagm
202