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.h"
9 #include "sk_tool_utils.h"
10
11 #include "Resources.h"
12 #include "SkBlurImageFilter.h"
13 #include "SkCanvas.h"
14 #include "SkColorFilterImageFilter.h"
15 #include "SkColorMatrixFilter.h"
16 #include "SkGradientShader.h"
17 #include "SkStream.h"
18 #include "SkTypeface.h"
19
20 /*
21 * Spits out a dummy gradient to test blur with shader on paint
22 */
MakeLinear()23 static sk_sp<SkShader> MakeLinear() {
24 constexpr SkPoint kPts[] = { { 0, 0 }, { 32, 32 } };
25 constexpr SkScalar kPos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
26 constexpr SkColor kColors[] = {0x80F00080, 0xF0F08000, 0x800080F0 };
27 return SkGradientShader::MakeLinear(kPts, kColors, kPos, SK_ARRAY_COUNT(kColors),
28 SkShader::kClamp_TileMode);
29 }
30
make_grayscale(sk_sp<SkImageFilter> input)31 static sk_sp<SkImageFilter> make_grayscale(sk_sp<SkImageFilter> input) {
32 SkScalar matrix[20];
33 memset(matrix, 0, 20 * sizeof(SkScalar));
34 matrix[0] = matrix[5] = matrix[10] = 0.2126f;
35 matrix[1] = matrix[6] = matrix[11] = 0.7152f;
36 matrix[2] = matrix[7] = matrix[12] = 0.0722f;
37 matrix[18] = 1.0f;
38 sk_sp<SkColorFilter> filter(SkColorFilter::MakeMatrixFilterRowMajor255(matrix));
39 return SkColorFilterImageFilter::Make(std::move(filter), std::move(input));
40 }
41
make_blur(float amount,sk_sp<SkImageFilter> input)42 static sk_sp<SkImageFilter> make_blur(float amount, sk_sp<SkImageFilter> input) {
43 return SkBlurImageFilter::Make(amount, amount, std::move(input));
44 }
45
make_color_filter()46 static sk_sp<SkColorFilter> make_color_filter() {
47 return SkColorMatrixFilter::MakeLightingFilter(SkColorSetRGB(0x00, 0x80, 0xFF),
48 SkColorSetRGB(0xFF, 0x20, 0x00));
49 }
50
51 namespace skiagm {
52
53 class ColorEmojiGM : public GM {
54 public:
ColorEmojiGM()55 ColorEmojiGM() { }
56
57 protected:
58 struct EmojiFont {
59 sk_sp<SkTypeface> typeface;
60 const char* text;
61 } emojiFont;
onOnceBeforeDraw()62 virtual void onOnceBeforeDraw() override {
63 emojiFont.typeface = sk_tool_utils::emoji_typeface();
64 emojiFont.text = sk_tool_utils::emoji_sample_text();
65 }
66
onShortName()67 SkString onShortName() override {
68 SkString name("coloremoji");
69 name.append(sk_tool_utils::platform_font_manager());
70 return name;
71 }
72
onISize()73 SkISize onISize() override { return SkISize::Make(650, 1200); }
74
onDraw(SkCanvas * canvas)75 void onDraw(SkCanvas* canvas) override {
76
77 canvas->drawColor(sk_tool_utils::color_to_565(SK_ColorGRAY));
78
79 SkPaint paint;
80 paint.setTypeface(emojiFont.typeface);
81 const char* text = emojiFont.text;
82
83 // draw text at different point sizes
84 constexpr SkScalar textSizes[] = { 10, 30, 50, };
85 SkPaint::FontMetrics metrics;
86 SkScalar y = 0;
87 for (const bool& fakeBold : { false, true }) {
88 paint.setFakeBoldText(fakeBold);
89 for (const SkScalar& textSize : textSizes) {
90 paint.setTextSize(textSize);
91 paint.getFontMetrics(&metrics);
92 y += -metrics.fAscent;
93 canvas->drawString(text, 10, y, paint);
94 y += metrics.fDescent + metrics.fLeading;
95 }
96 }
97
98 y += 20;
99 SkScalar savedY = y;
100 // draw with shaders and image filters
101 for (int makeLinear = 0; makeLinear < 2; makeLinear++) {
102 for (int makeBlur = 0; makeBlur < 2; makeBlur++) {
103 for (int makeGray = 0; makeGray < 2; makeGray++) {
104 for (int makeMode = 0; makeMode < 2; ++makeMode) {
105 for (int alpha = 0; alpha < 2; ++alpha) {
106 SkPaint shaderPaint;
107 shaderPaint.setTypeface(sk_ref_sp(paint.getTypeface()));
108 if (SkToBool(makeLinear)) {
109 shaderPaint.setShader(MakeLinear());
110 }
111
112 if (SkToBool(makeBlur) && SkToBool(makeGray)) {
113 sk_sp<SkImageFilter> grayScale(make_grayscale(nullptr));
114 sk_sp<SkImageFilter> blur(make_blur(3.0f, std::move(grayScale)));
115 shaderPaint.setImageFilter(std::move(blur));
116 } else if (SkToBool(makeBlur)) {
117 shaderPaint.setImageFilter(make_blur(3.0f, nullptr));
118 } else if (SkToBool(makeGray)) {
119 shaderPaint.setImageFilter(make_grayscale(nullptr));
120 }
121 if (makeMode) {
122 shaderPaint.setColorFilter(make_color_filter());
123 }
124 if (alpha) {
125 shaderPaint.setAlpha(0x80);
126 }
127 shaderPaint.setTextSize(30);
128 shaderPaint.getFontMetrics(&metrics);
129 y += -metrics.fAscent;
130 canvas->drawString(text, 380, y, shaderPaint);
131 y += metrics.fDescent + metrics.fLeading;
132 }
133 }
134 }
135 }
136 }
137 // setup work needed to draw text with different clips
138 canvas->translate(10, savedY);
139 paint.setTextSize(40);
140
141 // compute the bounds of the text
142 SkRect bounds;
143 paint.measureText(text, strlen(text), &bounds);
144
145 const SkScalar boundsHalfWidth = bounds.width() * SK_ScalarHalf;
146 const SkScalar boundsHalfHeight = bounds.height() * SK_ScalarHalf;
147 const SkScalar boundsQuarterWidth = boundsHalfWidth * SK_ScalarHalf;
148 const SkScalar boundsQuarterHeight = boundsHalfHeight * SK_ScalarHalf;
149
150 SkRect upperLeftClip = SkRect::MakeXYWH(bounds.left(), bounds.top(),
151 boundsHalfWidth, boundsHalfHeight);
152 SkRect lowerRightClip = SkRect::MakeXYWH(bounds.centerX(), bounds.centerY(),
153 boundsHalfWidth, boundsHalfHeight);
154 SkRect interiorClip = bounds;
155 interiorClip.inset(boundsQuarterWidth, boundsQuarterHeight);
156
157 const SkRect clipRects[] = { bounds, upperLeftClip, lowerRightClip, interiorClip };
158
159 SkPaint clipHairline;
160 clipHairline.setColor(SK_ColorWHITE);
161 clipHairline.setStyle(SkPaint::kStroke_Style);
162
163 for (const SkRect& clipRect : clipRects) {
164 canvas->translate(0, bounds.height());
165 canvas->save();
166 canvas->drawRect(clipRect, clipHairline);
167 paint.setAlpha(0x20);
168 canvas->drawString(text, 0, 0, paint);
169 canvas->clipRect(clipRect);
170 paint.setAlpha(0xFF);
171 canvas->drawString(text, 0, 0, paint);
172 canvas->restore();
173 canvas->translate(0, SkIntToScalar(25));
174 }
175 }
176
177 typedef GM INHERITED;
178 };
179
180 //////////////////////////////////////////////////////////////////////////////
181
182 DEF_GM(return new ColorEmojiGM;)
183
184 }
185