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1 // Copyright 2012 The Chromium Authors. All rights reserved. | 1 // Copyright 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef CCFontAtlas_h |
| 6 #define CCFontAtlas_h |
| 7 |
| 8 #if USE(ACCELERATED_COMPOSITING) |
| 9 |
| 10 #include <string> |
| 11 |
| 12 #include "base/basictypes.h" |
| 13 #include "base/memory/scoped_ptr.h" |
| 14 #include "IntRect.h" |
| 15 #include "SkBitmap.h" |
| 16 |
| 17 class SkCanvas; |
| 18 |
| 19 namespace gfx { |
| 20 class Point; |
| 21 } |
| 22 |
| 23 namespace cc { |
| 24 |
| 25 class Color; |
| 26 class FontDescription; |
| 27 class GraphicsContext; |
| 28 class IntSize; |
| 29 |
| 30 // This class provides basic ability to draw text onto the heads-up display. |
| 31 class CCFontAtlas { |
| 32 public: |
| 33 static scoped_ptr<CCFontAtlas> create(SkBitmap bitmap, IntRect asciiToRectTa
ble[128], int fontHeight) |
| 34 { |
| 35 return make_scoped_ptr(new CCFontAtlas(bitmap, asciiToRectTable, fontHei
ght)); |
| 36 } |
| 37 ~CCFontAtlas(); |
| 38 |
| 39 // Draws multiple lines of text where each line of text is separated by '\n'
. |
| 40 // - Correct glyphs will be drawn for ASCII codes in the range 32-127; any c
haracters |
| 41 // outside that range will be displayed as a default rectangle glyph. |
| 42 // - IntSize clip is used to avoid wasting time drawing things that are outs
ide the |
| 43 // target canvas bounds. |
| 44 // - Should only be called only on the impl thread. |
| 45 void drawText(SkCanvas*, const SkPaint&, const std::string& text, const gfx:
:Point& destPosition, const IntSize& clip) const; |
| 46 |
| 47 // Draws the entire atlas at the specified position, just for debugging purp
oses. |
| 48 void drawDebugAtlas(SkCanvas*, const gfx::Point& destPosition) const; |
| 49 |
| 50 private: |
| 51 CCFontAtlas(SkBitmap, IntRect asciiToRectTable[128], int fontHeight); |
| 52 |
| 53 void drawOneLineOfTextInternal(SkCanvas*, const SkPaint&, const std::string&
, const gfx::Point& destPosition) const; |
| 54 |
| 55 // The actual texture atlas containing all the pre-rendered glyphs. |
| 56 SkBitmap m_atlas; |
| 57 |
| 58 // The look-up tables mapping ascii characters to their IntRect locations on
the atlas. |
| 59 IntRect m_asciiToRectTable[128]; |
| 60 |
| 61 int m_fontHeight; |
| 62 |
| 63 DISALLOW_COPY_AND_ASSIGN(CCFontAtlas); |
| 64 }; |
| 65 |
| 66 } // namespace cc |
| 67 |
| 68 #endif // USE(ACCELERATED_COMPOSITING) |
| 69 |
| 70 #endif |
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