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 static void drawTestCase(SkCanvas*, const char*, SkScalar, const SkPaint&);
21
DEF_SIMPLE_GM_BG(glyph_pos_align,canvas,kWidth,kHeight,SK_ColorBLACK)22 DEF_SIMPLE_GM_BG(glyph_pos_align, canvas, kWidth, kHeight, SK_ColorBLACK) {
23 SkPaint paint;
24 paint.setTextSize(kTextHeight);
25 paint.setFakeBoldText(true);
26 const SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE };
27 const SkPoint pts[] = {{0, 0}, {kWidth, kHeight}};
28 SkAutoTUnref<SkShader> grad(SkGradientShader::CreateLinear(pts, colors, nullptr,
29 SK_ARRAY_COUNT(colors),
30 SkShader::kMirror_TileMode));
31 paint.setShader(grad);
32
33
34 paint.setTextAlign(SkPaint::kRight_Align);
35 drawTestCase(canvas, "Right Align", kTextHeight, paint);
36
37 paint.setTextAlign(SkPaint::kCenter_Align);
38 drawTestCase(canvas, "Center Align", 4 * kTextHeight, paint);
39
40 paint.setTextAlign(SkPaint::kLeft_Align);
41 drawTestCase(canvas, "Left Align", 7 * kTextHeight, paint);
42 }
43
drawTestCase(SkCanvas * canvas,const char * text,SkScalar y,const SkPaint & paint)44 void drawTestCase(SkCanvas* canvas, const char* text, SkScalar y, const SkPaint& paint) {
45 SkScalar widths[kMaxStringLength];
46 SkScalar posX[kMaxStringLength];
47 SkPoint pos[kMaxStringLength];
48 int length = SkToInt(strlen(text));
49 SkASSERT(length <= kMaxStringLength);
50
51 paint.getTextWidths(text, length, widths);
52
53 float originX;
54 switch (paint.getTextAlign()) {
55 case SkPaint::kRight_Align: originX = 1; break;
56 case SkPaint::kCenter_Align: originX = 0.5f; break;
57 case SkPaint::kLeft_Align: originX = 0; break;
58 default: SkFAIL("Invalid paint origin"); return;
59 }
60
61 float x = kTextHeight;
62 for (int i = 0; i < length; ++i) {
63 posX[i] = x + originX * widths[i];
64 pos[i].set(posX[i], i ? pos[i - 1].y() + 3 : y + kTextHeight);
65 x += widths[i];
66 }
67
68 canvas->drawPosTextH(text, length, posX, y, paint);
69 canvas->drawPosText(text, length, pos, paint);
70 }
71