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
9 /* Tests text rendering with LCD and subpixel rendering turned on and off.
10 */
11
12 #include "gm.h"
13 #include "SkCanvas.h"
14 #include "SkPicture.h"
15 #include "SkPictureImageFilter.h"
16 #include "SkPictureRecorder.h"
17 #include "SkSurface.h"
18
19
20 class LcdTextGM : public skiagm::GM {
21 public:
LcdTextGM()22 LcdTextGM() {
23 const int pointSize = 36;
24 textHeight = SkIntToScalar(pointSize);
25 }
26
27 protected:
28
onShortName()29 SkString onShortName() {
30 SkString name("lcdtext");
31 name.append(sk_tool_utils::major_platform_os_name());
32 return name;
33 }
34
onISize()35 SkISize onISize() { return SkISize::Make(640, 480); }
36
onDraw(SkCanvas * canvas)37 virtual void onDraw(SkCanvas* canvas) {
38
39 y = textHeight;
40 drawText(canvas, SkString("TEXT: SubpixelTrue LCDRenderTrue"),
41 true, true);
42 drawText(canvas, SkString("TEXT: SubpixelTrue LCDRenderFalse"),
43 true, false);
44 drawText(canvas, SkString("TEXT: SubpixelFalse LCDRenderTrue"),
45 false, true);
46 drawText(canvas, SkString("TEXT: SubpixelFalse LCDRenderFalse"),
47 false, false);
48 }
49
drawText(SkCanvas * canvas,const SkString & string,bool subpixelTextEnabled,bool lcdRenderTextEnabled)50 void drawText(SkCanvas* canvas, const SkString& string,
51 bool subpixelTextEnabled, bool lcdRenderTextEnabled) {
52 SkPaint paint;
53 paint.setColor(SK_ColorBLACK);
54 paint.setDither(true);
55 paint.setAntiAlias(true);
56 paint.setSubpixelText(subpixelTextEnabled);
57 paint.setLCDRenderText(lcdRenderTextEnabled);
58 paint.setTextSize(textHeight);
59
60 canvas->drawText(string.c_str(), string.size(), 0, y, paint);
61 y += textHeight;
62 }
63
64 private:
65 typedef skiagm::GM INHERITED;
66 SkScalar y, textHeight;
67 };
68
69 /*
70 * Skia will automatically disable LCD requests if the total size exceeds some limit
71 * (hard coded in this test for now, as it is now avaiable as an API)
72 *
73 * Test this both by changing "textsize" and by changing the computed size (textsize * CTM)
74 */
75 class LcdTextSizeGM : public skiagm::GM {
76 enum {
77 kLCDTextSizeLimit = 48
78 };
79
ScaleAbout(SkCanvas * canvas,SkScalar sx,SkScalar sy,SkScalar px,SkScalar py)80 static void ScaleAbout(SkCanvas* canvas, SkScalar sx, SkScalar sy, SkScalar px, SkScalar py) {
81 SkMatrix m;
82 m.setScale(sx, sy, px, py);
83 canvas->concat(m);
84 }
85
86 public:
LcdTextSizeGM()87 LcdTextSizeGM() {}
88
89 protected:
onShortName()90 SkString onShortName() {
91 return SkString("lcdtextsize");
92 }
93
onISize()94 SkISize onISize() { return SkISize::Make(320, 120); }
95
onDraw(SkCanvas * canvas)96 virtual void onDraw(SkCanvas* canvas) {
97 const char* lcd_text = "LCD";
98 const char* gray_text = "GRAY";
99
100 SkPaint paint;
101 paint.setAntiAlias(true);
102 paint.setLCDRenderText(true);
103
104 const struct {
105 SkPoint fLoc;
106 SkScalar fTextSize;
107 SkScalar fScale;
108 const char* fText;
109 } rec[] = {
110 { { 10, 50 }, kLCDTextSizeLimit - 1, 1, lcd_text },
111 { { 160, 50 }, kLCDTextSizeLimit + 1, 1, gray_text },
112 { { 10, 100 }, kLCDTextSizeLimit / 2, 1.99f, lcd_text },
113 { { 160, 100 }, kLCDTextSizeLimit / 2, 2.01f, gray_text },
114 };
115
116 for (size_t i = 0; i < SK_ARRAY_COUNT(rec); ++i) {
117 const SkPoint loc = rec[i].fLoc;
118 SkAutoCanvasRestore acr(canvas, true);
119
120 paint.setTextSize(rec[i].fTextSize);
121 ScaleAbout(canvas, rec[i].fScale, rec[i].fScale, loc.x(), loc.y());
122 canvas->drawText(rec[i].fText, strlen(rec[i].fText), loc.x(), loc.y(), paint);
123 }
124 }
125
126 private:
127 typedef skiagm::GM INHERITED;
128 };
129 DEF_GM( return new LcdTextGM; )
DEF_GM(return new LcdTextSizeGM;)130 DEF_GM( return new LcdTextSizeGM; )
131
132 ///////////////////////////////////////////////////////////////////////////////////////////////////
133
134 DEF_SIMPLE_GM(savelayer_lcdtext, canvas, 620, 260) {
135 SkPaint paint;
136 paint.setAntiAlias(true);
137 paint.setLCDRenderText(true);
138 paint.setTextSize(20);
139
140 canvas->drawText("Hamburgefons", 12, 30, 30, paint);
141
142 const bool gPreserveLCDText[] = { false, true };
143
144 canvas->translate(0, 20);
145 for (auto preserve : gPreserveLCDText) {
146 preserve ? canvas->saveLayerPreserveLCDTextRequests(nullptr, nullptr)
147 : canvas->saveLayer(nullptr, nullptr);
148 canvas->drawText("Hamburgefons", 12, 30, 60, paint);
149
150 SkPaint p;
151 p.setColor(0xFFCCCCCC);
152 canvas->drawRect(SkRect::MakeLTRB(25, 70, 200, 100), p);
153 canvas->drawText("Hamburgefons", 12, 30, 90, paint);
154
155 canvas->restore();
156 canvas->translate(0, 80);
157 }
158 }
159