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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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