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1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "webkit/glue/plugins/pepper_private2.h" | |
6 | |
7 #include "skia/ext/platform_canvas.h" | |
8 #include "ppapi/c/pp_point.h" | |
9 #include "ppapi/c/pp_rect.h" | |
10 #include "ppapi/c/dev/ppb_font_dev.h" | |
11 #include "third_party/skia/include/core/SkCanvas.h" | |
12 #include "third_party/skia/include/core/SkMatrix.h" | |
13 #include "third_party/skia/include/core/SkPaint.h" | |
14 #include "third_party/skia/include/core/SkPoint.h" | |
15 #include "third_party/skia/include/core/SkTemplates.h" | |
16 #include "third_party/skia/include/core/SkTypeface.h" | |
17 #include "webkit/glue/plugins/pepper_image_data.h" | |
18 #include "webkit/glue/plugins/pepper_var.h" | |
19 | |
20 namespace pepper { | |
21 | |
22 bool Private2::DrawGlyphs(PP_Resource pp_image_data, | |
23 const PP_FontDescription_Dev* font_desc, | |
24 uint32_t color, | |
25 PP_Point position, | |
26 PP_Rect clip, | |
27 const float transformation[3][3], | |
28 uint32_t glyph_count, | |
29 const uint16_t glyph_indices[], | |
30 const PP_Point glyph_advances[]) { | |
31 scoped_refptr<ImageData> image_resource( | |
32 Resource::GetAs<ImageData>(pp_image_data)); | |
33 if (!image_resource.get()) | |
34 return false; | |
35 ImageDataAutoMapper mapper(image_resource); | |
36 if (!mapper.is_valid()) | |
37 return false; | |
38 | |
39 // Set up the typeface. | |
40 scoped_refptr<StringVar> face_name(StringVar::FromPPVar(font_desc->face)); | |
41 if (!face_name) | |
42 return false; | |
43 int style = SkTypeface::kNormal; | |
44 if (font_desc->weight >= PP_FONTWEIGHT_BOLD) | |
45 style |= SkTypeface::kBold; | |
46 if (font_desc->italic) | |
47 style |= SkTypeface::kItalic; | |
48 SkTypeface* typeface = | |
49 SkTypeface::CreateFromName(face_name->value().c_str(), | |
50 static_cast<SkTypeface::Style>(style)); | |
51 if (!typeface) | |
52 return false; | |
53 | |
54 // Set up the canvas. | |
55 SkCanvas* canvas = image_resource->mapped_canvas(); | |
56 canvas->save(); | |
57 | |
58 // Clip is applied in pixels before the transform. | |
59 SkRect clip_rect = { clip.point.x, clip.point.y, | |
60 clip.point.x + clip.size.width, | |
61 clip.point.y + clip.size.height }; | |
62 canvas->clipRect(clip_rect); | |
63 | |
64 // -- Do not return early below this. The canvas needs restoring and the | |
65 // typeface will leak if it's not assigned to the paint (it's refcounted and | |
66 // the refcount is currently 0). | |
67 | |
68 // Convert & set the matrix. | |
69 SkMatrix matrix; | |
70 matrix.set(SkMatrix::kMScaleX, SkFloatToScalar(transformation[0][0])); | |
71 matrix.set(SkMatrix::kMSkewX, SkFloatToScalar(transformation[0][1])); | |
72 matrix.set(SkMatrix::kMTransX, SkFloatToScalar(transformation[0][2])); | |
73 matrix.set(SkMatrix::kMSkewY, SkFloatToScalar(transformation[1][0])); | |
74 matrix.set(SkMatrix::kMScaleY, SkFloatToScalar(transformation[1][1])); | |
75 matrix.set(SkMatrix::kMTransY, SkFloatToScalar(transformation[1][2])); | |
76 matrix.set(SkMatrix::kMPersp0, SkFloatToScalar(transformation[2][0])); | |
77 matrix.set(SkMatrix::kMPersp1, SkFloatToScalar(transformation[2][1])); | |
78 matrix.set(SkMatrix::kMPersp2, SkFloatToScalar(transformation[2][2])); | |
79 canvas->concat(matrix); | |
80 | |
81 SkPaint paint; | |
82 paint.setColor(color); | |
83 paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding); | |
84 paint.setAntiAlias(true); | |
85 paint.setHinting(SkPaint::kFull_Hinting); | |
86 paint.setTextSize(SkIntToScalar(font_desc->size)); | |
87 paint.setTypeface(typeface); // Takes a ref and manages lifetime. | |
88 paint.setSubpixelText(true); | |
89 paint.setLCDRenderText(true); | |
90 | |
91 SkScalar x = SkIntToScalar(position.x); | |
92 SkScalar y = SkIntToScalar(position.y); | |
93 | |
94 // Build up the skia advances. | |
95 SkAutoSTMalloc<32, SkPoint> storage(glyph_count); | |
96 SkPoint* sk_positions = storage.get(); | |
97 for (uint32_t i = 0; i < glyph_count; i++) { | |
98 sk_positions[i].set(x, y); | |
99 x += SkFloatToScalar(glyph_advances[i].x); | |
100 y += SkFloatToScalar(glyph_advances[i].y); | |
101 } | |
102 | |
103 canvas->drawPosText(glyph_indices, glyph_count * 2, sk_positions, paint); | |
104 | |
105 canvas->restore(); | |
106 return true; | |
107 } | |
108 | |
109 } // namespace pepper | |
110 | |
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