webkit/plugins/ppapi/ppb_flash_impl_linux.cc - Issue 8899015: Implement platform-independent DrawGlyphs for Flash.

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Issue 8899015: Implement platform-independent DrawGlyphs for Flash. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src

Patch Set: Created 9 years ago

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1 // Copyright (c) 2011 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/plugins/ppapi/ppb_flash_impl.h"

6

7 #include "ppapi/c/pp_point.h"

8 #include "ppapi/c/pp_rect.h"

9 #include "ppapi/c/dev/ppb_font_dev.h"

10 #include "ppapi/shared_impl/var.h"

11 #include "ppapi/thunk/enter.h"

12 #include "skia/ext/platform_canvas.h"

13 #include "third_party/skia/include/core/SkCanvas.h"

14 #include "third_party/skia/include/core/SkMatrix.h"

15 #include "third_party/skia/include/core/SkPaint.h"

16 #include "third_party/skia/include/core/SkPoint.h"

17 #include "third_party/skia/include/core/SkTemplates.h"

18 #include "third_party/skia/include/core/SkTypeface.h"

19 #include "webkit/plugins/ppapi/ppb_image_data_impl.h"

20

21 using ppapi::StringVar;

22 using ppapi::thunk::EnterResource;

23 using ppapi::thunk::PPB_ImageData_API;

24

25 namespace webkit {

26 namespace ppapi {

27

28 PP_Bool PPB_Flash_Impl::DrawGlyphs(PP_Instance,

29 PP_Resource pp_image_data,

30 const PP_FontDescription_Dev* font_desc,

31 uint32_t color,

32 PP_Point position,

33 PP_Rect clip,

34 const float transformation[3][3],

35 uint32_t glyph_count,

36 const uint16_t glyph_indices[],

37 const PP_Point glyph_advances[]) {

38 EnterResource<PPB_ImageData_API> enter(pp_image_data, true);

39 if (enter.failed())

40 return PP_FALSE;

41 PPB_ImageData_Impl* image_resource =

42 static_cast<PPB_ImageData_Impl*>(enter.object());

43

44 ImageDataAutoMapper mapper(image_resource);

45 if (!mapper.is_valid())

46 return PP_FALSE;

47

48 // Set up the typeface.

49 StringVar* face_name = StringVar::FromPPVar(font_desc->face);

50 if (!face_name)

51 return PP_FALSE;

52 int style = SkTypeface::kNormal;

53 if (font_desc->weight >= PP_FONTWEIGHT_BOLD)

54 style \|= SkTypeface::kBold;

55 if (font_desc->italic)

56 style \|= SkTypeface::kItalic;

57 SkTypeface* typeface =

58 SkTypeface::CreateFromName(face_name->value().c_str(),

59 static_cast<SkTypeface::Style>(style));

60 if (!typeface)

61 return PP_FALSE;

62

63 // Set up the canvas.

64 SkCanvas* canvas = image_resource->mapped_canvas();

65 canvas->save();

66

67 // Clip is applied in pixels before the transform.

68 SkRect clip_rect = { clip.point.x, clip.point.y,

69 clip.point.x + clip.size.width,

70 clip.point.y + clip.size.height };

71 canvas->clipRect(clip_rect);

72

73 // -- Do not return early below this. The canvas needs restoring and the

74 // typeface will leak if it's not assigned to the paint (it's refcounted and

75 // the refcount is currently 0).

76

77 // Convert & set the matrix.

78 SkMatrix matrix;

79 matrix.set(SkMatrix::kMScaleX, SkFloatToScalar(transformation[0][0]));

80 matrix.set(SkMatrix::kMSkewX, SkFloatToScalar(transformation[0][1]));

81 matrix.set(SkMatrix::kMTransX, SkFloatToScalar(transformation[0][2]));

82 matrix.set(SkMatrix::kMSkewY, SkFloatToScalar(transformation[1][0]));

83 matrix.set(SkMatrix::kMScaleY, SkFloatToScalar(transformation[1][1]));

84 matrix.set(SkMatrix::kMTransY, SkFloatToScalar(transformation[1][2]));

85 matrix.set(SkMatrix::kMPersp0, SkFloatToScalar(transformation[2][0]));

86 matrix.set(SkMatrix::kMPersp1, SkFloatToScalar(transformation[2][1]));

87 matrix.set(SkMatrix::kMPersp2, SkFloatToScalar(transformation[2][2]));

88 canvas->concat(matrix);

89

90 SkPaint paint;

91 paint.setColor(color);

92 paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);

93 paint.setAntiAlias(true);

94 paint.setHinting(SkPaint::kFull_Hinting);

95 paint.setTextSize(SkIntToScalar(font_desc->size));

96 paint.setTypeface(typeface); // Takes a ref and manages lifetime.

97 paint.setSubpixelText(true);

98 paint.setLCDRenderText(true);

99

100 SkScalar x = SkIntToScalar(position.x);

101 SkScalar y = SkIntToScalar(position.y);

102

103 // Build up the skia advances.

104 SkAutoSTMalloc<32, SkPoint> storage(glyph_count);

105 SkPoint* sk_positions = storage.get();

106 for (uint32_t i = 0; i < glyph_count; i++) {

107 sk_positions[i].set(x, y);

108 x += SkFloatToScalar(glyph_advances[i].x);

109 y += SkFloatToScalar(glyph_advances[i].y);

110 }

111

112 canvas->drawPosText(glyph_indices, glyph_count * 2, sk_positions, paint);

113

114 canvas->restore();

115 return PP_TRUE;

116 }

117

118 } // namespace ppapi

119 } // namespace webkit

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