1 /*
2  * Copyright 2015 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 #include "SkImage.h"
11 #include "SkRRect.h"
12 
13 static void rotated_checkerboard_shader(SkPaint* paint,
14                                         SkColor c1,
15                                         SkColor c2,
16                                         int size) {
17     SkBitmap bm;
18     bm.allocN32Pixels(2 * size, 2 * size);
19     bm.eraseColor(c1);
20     bm.eraseArea(SkIRect::MakeLTRB(0, 0, size, size), c2);
21     bm.eraseArea(SkIRect::MakeLTRB(size, size, 2 * size, 2 * size), c2);
22     SkMatrix matrix;
23     matrix.setScale(0.75f, 0.75f);
24     matrix.preRotate(30.0f);
25     paint->setShader(
26             SkShader::MakeBitmapShader(bm, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode,
27                                        &matrix));
28 }
29 
30 static void exercise_draw_pos_text(SkCanvas* canvas,
31                                    const char* text,
32                                    SkScalar x, SkScalar y,
33                                    const SkPaint& paint) {
34     size_t textLen = strlen(text);
35     int count = paint.countText(text, textLen);
36     SkAutoTArray<SkScalar> widths(count);
37     paint.getTextWidths(text, textLen, &widths[0]);
38     SkAutoTArray<SkPoint> pos(count);
39     for (int i = 0; i < count; ++i) {
40         pos[i].set(x, y);
41         x += widths[i];
42     }
43     canvas->drawPosText(text, textLen, &pos[0], paint);
44 }
45 
46 static void exercise_draw_pos_text_h(SkCanvas* canvas,
47                                      const char* text,
48                                      SkScalar x, SkScalar y,
49                                      const SkPaint& paint) {
50     size_t textLen = strlen(text);
51     int count = paint.countText(text, textLen);
52     SkAutoTArray<SkScalar> widths(count);
53     paint.getTextWidths(text, textLen, &widths[0]);
54     SkAutoTArray<SkScalar> pos(count);
55     for (int i = 0; i < count; ++i) {
56         pos[i] = x;
57         x += widths[i];
58     }
59     canvas->drawPosTextH(text, textLen, &pos[0], y, paint);
60 }
61 
62 static void test_text(SkCanvas* canvas, SkScalar size,
63                       SkColor color, SkScalar Y) {
64     SkPaint type;
65     type.setTextSize(24);
66     sk_tool_utils::set_portable_typeface(&type);
67     type.setColor(color);
68     const char text[] = "HELLO WORLD";
69     canvas->drawString(text, 32, size / 2 + Y, type);
70     SkScalar lineSpacing = type.getFontSpacing();
71     exercise_draw_pos_text(canvas, text, 32, size / 2 + Y + lineSpacing, type);
72     exercise_draw_pos_text_h(canvas, text, 32,
73                              size / 2 + Y + 2 * lineSpacing, type);
74 }
75 
76 // If this GM works correctly, the cyan layer should be lined up with
77 // the objects below it.
78 DEF_SIMPLE_GM(skbug_257, canvas, 512, 512) {
79     const SkScalar size = 256;
80     SkAutoCanvasRestore autoCanvasRestore0(canvas, true);
81     const SkScalar scale = 1.00168f;
82     canvas->scale(scale, scale);
83     {
84         SkPaint checker;
85         rotated_checkerboard_shader(&checker, SK_ColorWHITE, SK_ColorBLACK, 16);
86         checker.setAntiAlias(true);
87 
88         SkAutoCanvasRestore autoCanvasRestore(canvas, true);
89         canvas->clear(0xFFCECFCE);
90         SkScalar translate = 225364.0f;
91         canvas->translate(0, -translate);
92 
93         // Test rects
94         SkRect rect = SkRect::MakeLTRB(8, 8 + translate, size - 8,
95                                        size - 8 + translate);
96         canvas->drawRect(rect, checker);
97 
98         // Test Paths
99         canvas->translate(size, 0);
100         SkRRect rrect;
101         SkVector radii[4] = {{40, 40}, {40, 40}, {40, 40}, {40, 40}};
102         rrect.setRectRadii(rect, radii);
103         canvas->drawRRect(rrect, checker);
104 
105         // Test Points
106         canvas->translate(-size, size);
107         SkScalar delta = 1.0 / 64.0;
108         SkPoint points[8] = {{size / 2, 8 + translate},
109                              {size / 2, 8 + translate + delta},
110                              {8, size / 2 + translate},
111                              {8, size / 2 + translate + delta},
112                              {size / 2, size - 8 + translate},
113                              {size / 2, size - 8 + translate + delta},
114                              {size - 8, size / 2 + translate},
115                              {size - 8, size / 2 + translate + delta}};
116         checker.setStyle(SkPaint::kStroke_Style);
117         checker.setStrokeWidth(8);
118         checker.setStrokeCap(SkPaint::kRound_Cap);
119         canvas->drawPoints(SkCanvas::kLines_PointMode, 8, points, checker);
120 
121         // Test Text
122         canvas->translate(size, 0);
123         test_text(canvas, size, SK_ColorBLACK, translate);
124     }
125     // reference points (without the huge translations).
126     SkPaint stroke;
127     stroke.setStyle(SkPaint::kStroke_Style);
128     stroke.setStrokeWidth(5);
129     stroke.setColor(SK_ColorCYAN);
130     canvas->drawCircle(size / 2, size / 2, size / 2 - 10, stroke);
131     canvas->drawCircle(3 * size / 2, size / 2, size / 2 - 10, stroke);
132     canvas->drawCircle(size / 2, 384, size / 2 - 10, stroke);
133     canvas->translate(size, size);
134     test_text(canvas, size, SK_ColorCYAN, 0.0f);
135 }
136