1 /*
2 * Copyright 2014 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 "SkGradientShader.h"
11
12 /**
13 * This test exercises drawPosTextH and drawPosText with every text align.
14 */
15 static const int kWidth = 480;
16 static const int kHeight = 600;
17 static const SkScalar kTextHeight = 64.0f;
18 static const int kMaxStringLength = 12;
19
20 namespace skiagm {
21
22 class GlyphPosAlignGM : public GM {
23 protected:
onGetFlags() const24 virtual uint32_t onGetFlags() const SK_OVERRIDE {
25 return kSkipTiled_Flag;
26 }
27
onShortName()28 virtual SkString onShortName() SK_OVERRIDE {
29 return SkString("glyph_pos_align");
30 }
31
onISize()32 virtual SkISize onISize() { return SkISize::Make(kWidth, kHeight); }
33
onDraw(SkCanvas * canvas)34 virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
35 canvas->clear(SK_ColorBLACK);
36
37 SkPaint paint;
38 paint.setTextSize(kTextHeight);
39 paint.setFakeBoldText(true);
40 const SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE };
41 const SkPoint pts[] = {{0, 0}, {kWidth, kHeight}};
42 SkAutoTUnref<SkShader> grad(SkGradientShader::CreateLinear(pts, colors, NULL,
43 SK_ARRAY_COUNT(colors),
44 SkShader::kMirror_TileMode));
45 paint.setShader(grad);
46
47
48 paint.setTextAlign(SkPaint::kRight_Align);
49 drawTestCase(canvas, "Right Align", kTextHeight, paint);
50
51 paint.setTextAlign(SkPaint::kCenter_Align);
52 drawTestCase(canvas, "Center Align", 4 * kTextHeight, paint);
53
54 paint.setTextAlign(SkPaint::kLeft_Align);
55 drawTestCase(canvas, "Left Align", 7 * kTextHeight, paint);
56 }
57
drawTestCase(SkCanvas * canvas,const char * text,SkScalar y,const SkPaint & paint)58 void drawTestCase(SkCanvas* canvas, const char* text, SkScalar y, const SkPaint& paint) {
59 SkScalar widths[kMaxStringLength];
60 SkScalar posX[kMaxStringLength];
61 SkPoint pos[kMaxStringLength];
62 int length = strlen(text);
63 SkASSERT(length <= kMaxStringLength);
64
65 paint.getTextWidths(text, length, widths);
66
67 float originX;
68 switch (paint.getTextAlign()) {
69 case SkPaint::kRight_Align: originX = 1; break;
70 case SkPaint::kCenter_Align: originX = 0.5f; break;
71 case SkPaint::kLeft_Align: originX = 0; break;
72 default: SkFAIL("Invalid paint origin"); return;
73 }
74
75 float x = kTextHeight;
76 for (int i = 0; i < length; ++i) {
77 posX[i] = x + originX * widths[i];
78 pos[i].set(posX[i], i ? pos[i - 1].y() + 3 : y + kTextHeight);
79 x += widths[i];
80 }
81
82 canvas->drawPosTextH(text, length, posX, y, paint);
83 canvas->drawPosText(text, length, pos, paint);
84 }
85
86 private:
87
88 typedef GM INHERITED;
89 };
90
91 //////////////////////////////////////////////////////////////////////////////
92
GlyphPosAlignFactory(void *)93 static GM* GlyphPosAlignFactory(void*) {
94 return new GlyphPosAlignGM();
95 }
96
97 static GMRegistry reg(GlyphPosAlignFactory);
98
99 }
100