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
14static 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
28static 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
41static CGContextRef makeCG(const SkImageInfo& info, const void* addr,
42                           size_t rowBytes) {
43    if (kN32_SkColorType != info.colorType() || NULL == addr) {
44        return NULL;
45    }
46    CGColorSpaceRef space = CGColorSpaceCreateDeviceRGB();
47    CGContextRef cg = CGBitmapContextCreate((void*)addr, info.width(), info.height(),
48                                            8, rowBytes, space, BITMAP_INFO_RGB);
49    CFRelease(space);
50
51    CGContextSetAllowsFontSubpixelQuantization(cg, false);
52    CGContextSetShouldSubpixelQuantizeFonts(cg, false);
53
54    return cg;
55}
56
57extern CTFontRef SkTypeface_GetCTFontRef(const SkTypeface* face);
58
59static 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
68static 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
89static 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
102namespace 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
113class GammaTextGM : public GM {
114public:
115    GammaTextGM() {
116
117    }
118
119protected:
120    virtual SkString onShortName() {
121        return SkString("gammatext");
122    }
123
124    virtual SkISize onISize() {
125        return SkISize::Make(1024, HEIGHT);
126    }
127
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
144    virtual void onDraw(SkCanvas* canvas) {
145#ifdef SK_BUILD_FOR_MAC
146        CGContextRef cg = 0;
147        {
148            SkImageInfo info;
149            size_t rowBytes;
150            const void* addr = canvas->peekPixels(&info, &rowBytes);
151            if (addr) {
152                cg = makeCG(info, addr, rowBytes);
153            }
154        }
155#endif
156
157        drawGrad(canvas);
158
159        const SkColor fg[] = {
160            0xFFFFFFFF,
161            0xFFFFFF00, 0xFFFF00FF, 0xFF00FFFF,
162            0xFFFF0000, 0xFF00FF00, 0xFF0000FF,
163            0xFF000000,
164        };
165
166        const char* text = "Hamburgefons";
167        size_t len = strlen(text);
168
169        SkPaint paint;
170        setFont(&paint, "Times");
171        paint.setTextSize(SkIntToScalar(16));
172        paint.setAntiAlias(true);
173        paint.setLCDRenderText(true);
174
175        SkScalar x = SkIntToScalar(10);
176        for (size_t i = 0; i < SK_ARRAY_COUNT(fg); ++i) {
177            paint.setColor(fg[i]);
178
179            SkScalar y = SkIntToScalar(40);
180            SkScalar stopy = SkIntToScalar(HEIGHT);
181            while (y < stopy) {
182                if (true) {
183                    canvas->drawText(text, len, x, y, paint);
184                }
185#ifdef SK_BUILD_FOR_MAC
186                else {
187                    cgDrawText(cg, text, len, SkScalarToFloat(x),
188                               static_cast<float>(HEIGHT) - SkScalarToFloat(y),
189                               paint);
190                }
191#endif
192                y += paint.getTextSize() * 2;
193            }
194            x += SkIntToScalar(1024) / SK_ARRAY_COUNT(fg);
195        }
196#ifdef SK_BUILD_FOR_MAC
197        CGContextRelease(cg);
198#endif
199    }
200
201private:
202    typedef GM INHERITED;
203};
204
205//////////////////////////////////////////////////////////////////////////////
206
207static GM* MyFactory(void*) { return new GammaTextGM; }
208static GMRegistry reg(MyFactory);
209
210}
211