| /* |
| * Copyright (C) 2006, 2009, 2011 Apple Inc. All rights reserved. |
| * Copyright (C) 2007-2008 Torch Mobile Inc. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
| * its contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
| * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef GlyphBuffer_h |
| #define GlyphBuffer_h |
| |
| #include "platform/fonts/Glyph.h" |
| #include "platform/geometry/FloatPoint.h" |
| #include "platform/heap/Heap.h" |
| #include "wtf/Vector.h" |
| |
| namespace blink { |
| |
| class SimpleFontData; |
| |
| class GlyphBuffer { |
| STACK_ALLOCATED(); |
| |
| public: |
| bool isEmpty() const { return m_fontData.isEmpty(); } |
| unsigned size() const { |
| ASSERT(m_fontData.size() == m_glyphs.size()); |
| ASSERT(m_fontData.size() == m_offsets.size() || |
| 2 * m_fontData.size() == m_offsets.size()); |
| return m_fontData.size(); |
| } |
| |
| bool hasVerticalOffsets() const { |
| // We exclusively store either horizontal/x-only ofssets -- in which case |
| // m_offsets.size == size, or vertical/xy offsets -- in which case |
| // m_offsets.size == size * 2. |
| return size() != m_offsets.size(); |
| } |
| |
| const Glyph* glyphs(unsigned from) const { |
| ASSERT(from < size()); |
| return m_glyphs.data() + from; |
| } |
| |
| // Depending on the GlyphBuffer-wide positioning mode, this either points to |
| // an array of x-only offsets for horizontal positioning ([x1, x2, ... xn]), |
| // or interleaved x,y offsets for full positioning ([x1, y1, ... xn, yn]). |
| const float* offsets(unsigned from) const { |
| ASSERT(from < size()); |
| return m_offsets.data() + (hasVerticalOffsets() ? from * 2 : from); |
| } |
| |
| const SimpleFontData* fontDataAt(unsigned index) const { |
| ASSERT(index < size()); |
| return m_fontData[index]; |
| } |
| |
| Glyph glyphAt(unsigned index) const { |
| ASSERT(index < size()); |
| return m_glyphs[index]; |
| } |
| |
| float xOffsetAt(unsigned index) const { |
| ASSERT(index < size()); |
| return hasVerticalOffsets() ? m_offsets[index * 2] : m_offsets[index]; |
| } |
| |
| float yOffsetAt(unsigned index) const { |
| ASSERT(index < size()); |
| ASSERT(hasVerticalOffsets()); |
| return m_offsets[index * 2 + 1]; |
| } |
| |
| void add(Glyph glyph, const SimpleFontData* font, float x) { |
| // cannot mix x-only/xy offsets |
| ASSERT(!hasVerticalOffsets()); |
| |
| m_fontData.append(font); |
| m_glyphs.append(glyph); |
| m_offsets.append(x); |
| } |
| |
| void add(Glyph glyph, const SimpleFontData* font, const FloatPoint& offset) { |
| // cannot mix x-only/xy offsets |
| ASSERT(isEmpty() || hasVerticalOffsets()); |
| |
| m_fontData.append(font); |
| m_glyphs.append(glyph); |
| m_offsets.append(offset.x()); |
| m_offsets.append(offset.y()); |
| } |
| |
| void reverseForSimpleRTL(float afterOffset, float totalWidth) { |
| ASSERT(!hasVerticalOffsets()); |
| |
| if (isEmpty()) |
| return; |
| |
| m_fontData.reverse(); |
| m_glyphs.reverse(); |
| |
| // | .. [X0 X1 .. Xn] .. | |
| // ^ ^ ^ |
| // 0 afterOffset totalWidth |
| // |
| // The input buffer is shaped using RTL advances, but since the right edge |
| // is unknown at that time, offsets are computed as if the advances were |
| // LTR. This method performs the required adjustments by reconstructing |
| // advances and positioning offsets in an RTL progression. |
| |
| // FIXME: we should get rid of this (idea: store negative offsets while |
| // shaping, and adjust the initial advance accordingly -> should |
| // yield correctly positioned RTL glyphs without any post-shape |
| // munging). |
| ASSERT_WITH_SECURITY_IMPLICATION(!m_offsets.isEmpty()); |
| for (unsigned i = 0; i + 1 < m_offsets.size(); ++i) |
| m_offsets[i] = totalWidth - m_offsets[i + 1]; |
| m_offsets.last() = totalWidth - afterOffset; |
| |
| m_offsets.reverse(); |
| } |
| |
| protected: |
| Vector<const SimpleFontData*, 2048> m_fontData; |
| Vector<Glyph, 2048> m_glyphs; |
| |
| // Glyph positioning: either x-only offsets, or interleaved x,y offsets |
| // (depending on the buffer-wide positioning mode). This matches the |
| // glyph positioning format used by Skia. |
| Vector<float, 2048> m_offsets; |
| }; |
| |
| } // namespace blink |
| |
| #endif |