1 /*
2 * Copyright 2011 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 "SkCanvas.h"
10 #include "SkPath.h"
11 #include "SkGradientShader.h"
12 #include "SkTypeface.h"
13
make_heatGradient(const SkPoint pts[2])14 static SkShader* make_heatGradient(const SkPoint pts[2]) {
15 #if 0 // UNUSED
16 const SkColor colors[] = {
17 SK_ColorBLACK, SK_ColorBLUE, SK_ColorCYAN, SK_ColorGREEN,
18 SK_ColorYELLOW, SK_ColorRED, SK_ColorWHITE
19 };
20 #endif
21 const SkColor bw[] = { SK_ColorBLACK, SK_ColorWHITE };
22
23 return SkGradientShader::CreateLinear(pts, bw, NULL,
24 SK_ARRAY_COUNT(bw),
25 SkShader::kClamp_TileMode);
26 }
27
setFont(SkPaint * paint,const char name[])28 static bool setFont(SkPaint* paint, const char name[]) {
29 SkTypeface* tf = SkTypeface::CreateFromName(name, SkTypeface::kNormal);
30 if (tf) {
31 paint->setTypeface(tf)->unref();
32 return true;
33 }
34 return false;
35 }
36
37 #ifdef SK_BUILD_FOR_MAC
38 #import <ApplicationServices/ApplicationServices.h>
39 #define BITMAP_INFO_RGB (kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Host)
40
makeCG(const SkBitmap & bm)41 static CGContextRef makeCG(const SkBitmap& bm) {
42 if (SkBitmap::kARGB_8888_Config != bm.config() ||
43 NULL == bm.getPixels()) {
44 return NULL;
45 }
46 CGColorSpaceRef space = CGColorSpaceCreateDeviceRGB();
47 CGContextRef cg = CGBitmapContextCreate(bm.getPixels(), bm.width(), bm.height(),
48 8, bm.rowBytes(), space, BITMAP_INFO_RGB);
49 CFRelease(space);
50
51 CGContextSetAllowsFontSubpixelQuantization(cg, false);
52 CGContextSetShouldSubpixelQuantizeFonts(cg, false);
53
54 return cg;
55 }
56
57 extern CTFontRef SkTypeface_GetCTFontRef(const SkTypeface* face);
58
typefaceToCGFont(const SkTypeface * face)59 static CGFontRef typefaceToCGFont(const SkTypeface* face) {
60 if (NULL == face) {
61 return 0;
62 }
63
64 CTFontRef ct = SkTypeface_GetCTFontRef(face);
65 return CTFontCopyGraphicsFont(ct, NULL);
66 }
67
cgSetPaintForText(CGContextRef cg,const SkPaint & paint)68 static void cgSetPaintForText(CGContextRef cg, const SkPaint& paint) {
69 SkColor c = paint.getColor();
70 CGFloat rgba[] = {
71 SkColorGetB(c) / 255.0f,
72 SkColorGetG(c) / 255.0f,
73 SkColorGetR(c) / 255.0f,
74 SkColorGetA(c) / 255.0f,
75 };
76 CGContextSetRGBFillColor(cg, rgba[0], rgba[1], rgba[2], rgba[3]);
77
78 CGContextSetTextDrawingMode(cg, kCGTextFill);
79 CGContextSetFont(cg, typefaceToCGFont(paint.getTypeface()));
80 CGContextSetFontSize(cg, SkScalarToFloat(paint.getTextSize()));
81
82 CGContextSetAllowsFontSubpixelPositioning(cg, paint.isSubpixelText());
83 CGContextSetShouldSubpixelPositionFonts(cg, paint.isSubpixelText());
84
85 CGContextSetShouldAntialias(cg, paint.isAntiAlias());
86 CGContextSetShouldSmoothFonts(cg, paint.isLCDRenderText());
87 }
88
cgDrawText(CGContextRef cg,const void * text,size_t len,float x,float y,const SkPaint & paint)89 static void cgDrawText(CGContextRef cg, const void* text, size_t len,
90 float x, float y, const SkPaint& paint) {
91 if (cg) {
92 cgSetPaintForText(cg, paint);
93
94 uint16_t glyphs[200];
95 int count = paint.textToGlyphs(text, len, glyphs);
96
97 CGContextShowGlyphsAtPoint(cg, x, y, glyphs, count);
98 }
99 }
100 #endif
101
102 namespace skiagm {
103
104 /**
105 Test a set of clipping problems discovered while writing blitAntiRect,
106 and test all the code paths through the clipping blitters.
107 Each region should show as a blue center surrounded by a 2px green
108 border, with no red.
109 */
110
111 #define HEIGHT 480
112
113 class GammaTextGM : public GM {
114 public:
GammaTextGM()115 GammaTextGM() {
116
117 }
118
119 protected:
onShortName()120 virtual SkString onShortName() {
121 return SkString("gammatext");
122 }
123
onISize()124 virtual SkISize onISize() {
125 return make_isize(1024, HEIGHT);
126 }
127
drawGrad(SkCanvas * canvas)128 static void drawGrad(SkCanvas* canvas) {
129 SkPoint pts[] = { { 0, 0 }, { 0, SkIntToScalar(HEIGHT) } };
130 #if 0
131 const SkColor colors[] = { SK_ColorBLACK, SK_ColorWHITE };
132 SkShader* s = SkGradientShader::CreateLinear(pts, colors, NULL, 2, SkShader::kClamp_TileMode);
133 #else
134 SkShader* s = make_heatGradient(pts);
135 #endif
136
137 canvas->clear(SK_ColorRED);
138 SkPaint paint;
139 paint.setShader(s)->unref();
140 SkRect r = { 0, 0, SkIntToScalar(1024), SkIntToScalar(HEIGHT) };
141 canvas->drawRect(r, paint);
142 }
143
onDraw(SkCanvas * canvas)144 virtual void onDraw(SkCanvas* canvas) {
145 #ifdef SK_BUILD_FOR_MAC
146 CGContextRef cg = makeCG(canvas->getDevice()->accessBitmap(false));
147 #endif
148
149 drawGrad(canvas);
150
151 const SkColor fg[] = {
152 0xFFFFFFFF,
153 0xFFFFFF00, 0xFFFF00FF, 0xFF00FFFF,
154 0xFFFF0000, 0xFF00FF00, 0xFF0000FF,
155 0xFF000000,
156 };
157
158 const char* text = "Hamburgefons";
159 size_t len = strlen(text);
160
161 SkPaint paint;
162 setFont(&paint, "Times");
163 paint.setTextSize(SkIntToScalar(16));
164 paint.setAntiAlias(true);
165 paint.setLCDRenderText(true);
166
167 SkScalar x = SkIntToScalar(10);
168 for (size_t i = 0; i < SK_ARRAY_COUNT(fg); ++i) {
169 paint.setColor(fg[i]);
170
171 SkScalar y = SkIntToScalar(40);
172 SkScalar stopy = SkIntToScalar(HEIGHT);
173 while (y < stopy) {
174 if (true) {
175 canvas->drawText(text, len, x, y, paint);
176 }
177 #ifdef SK_BUILD_FOR_MAC
178 else {
179 cgDrawText(cg, text, len, SkScalarToFloat(x),
180 static_cast<float>(HEIGHT) - SkScalarToFloat(y),
181 paint);
182 }
183 #endif
184 y += paint.getTextSize() * 2;
185 }
186 x += SkIntToScalar(1024) / SK_ARRAY_COUNT(fg);
187 }
188 #ifdef SK_BUILD_FOR_MAC
189 CGContextRelease(cg);
190 #endif
191 }
192
193 private:
194 typedef GM INHERITED;
195 };
196
197 //////////////////////////////////////////////////////////////////////////////
198
MyFactory(void *)199 static GM* MyFactory(void*) { return new GammaTextGM; }
200 static GMRegistry reg(MyFactory);
201
202 }
203