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/*
* Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 COMPUTER, INC. OR
* 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.
*/
#include "config.h"
#include <windows.h>
#include "Font.h"
#include "FontFallbackList.h"
#include "GlyphBuffer.h"
#include "SimpleFontData.h"
#include "UniscribeStateTextRun.h"
#include "base/gfx/platform_canvas.h"
#include "graphics/SkiaUtils.h"
#include "webkit/glue/webkit_glue.h"
namespace WebCore {
void Font::drawGlyphs(GraphicsContext* graphicsContext,
const SimpleFontData* font,
const GlyphBuffer& glyphBuffer,
int from,
int numGlyphs,
const FloatPoint& point) const
{
PlatformGraphicsContext* context = graphicsContext->platformContext();
SkPoint origin;
WebCorePointToSkiaPoint(point, &origin);
// Max buffer length passed to the underlying windows API.
const int kMaxBufferLength = 1024;
// Default size for the buffer. It should be enough for most of cases.
const int kDefaultBufferLength = 256;
// Windows needs the characters and the advances in nice contiguous
// buffers, which we build here.
Vector<WORD, kDefaultBufferLength> glyphs;
Vector<int, kDefaultBufferLength> advances;
// We draw the glyphs in chunks to avoid having to do a heap allocation for
// the arrays of characters and advances. Since ExtTextOut is the
// lowest-level text output function on Windows, there should be little
// penalty for splitting up the text. On the other hand, the buffer cannot
// be bigger than 4094 or the function will fail.
int glyph_index = 0;
int chunk_x = 0; // x offset of this span from the point
while (glyph_index < numGlyphs) {
// how many chars will be in this chunk?
int cur_len = std::min(kMaxBufferLength, numGlyphs - glyph_index);
glyphs.resize(cur_len);
advances.resize(cur_len);
int cur_width = 0;
for (int i = 0; i < cur_len; ++i, ++glyph_index) {
glyphs[i] = glyphBuffer.glyphAt(from + glyph_index);
advances[i] = static_cast<int>(glyphBuffer.advanceAt(from +
glyph_index));
cur_width += advances[i];
}
// the 'point' represents the baseline, so we need to move it up to the
// top of the bounding square by subtracting the ascent
SkPoint origin2 = origin;
origin2.fY -= font->ascent();
origin2.fX += chunk_x;
bool success = false;
for (int executions = 0; executions < 2; ++executions) {
success = context->paintText(font->platformData().hfont(),
cur_len,
&glyphs[0],
&advances[0],
origin2);
if (!success && executions == 0) {
// Ask the browser to load the font for us and retry.
webkit_glue::EnsureFontLoaded(font->platformData().hfont());
continue;
}
break;
}
ASSERT(success);
chunk_x += cur_width;
}
}
FloatRect Font::selectionRectForComplexText(const TextRun& run,
const IntPoint& point,
int h,
int from,
int to) const
{
UniscribeStateTextRun state(run, *this);
float left = static_cast<float>(point.x() + state.CharacterToX(from));
float right = static_cast<float>(point.x() + state.CharacterToX(to));
// If the text is RTL, left will actually be after right.
if (left < right) {
return FloatRect(left, static_cast<float>(point.y()),
right - left, static_cast<float>(h));
}
return FloatRect(right, static_cast<float>(point.y()),
left - right, static_cast<float>(h));
}
void Font::drawComplexText(GraphicsContext* context,
const TextRun& run,
const FloatPoint& point,
int from,
int to) const
{
UniscribeStateTextRun state(run, *this);
PlatformContextSkia* skia = PlatformContextToPlatformContextSkia(context->platformContext());
SkPoint p;
WebCorePointToSkiaPoint(point, &p);
skia->paintComplexText(state, p, from, to, ascent());
}
float Font::floatWidthForComplexText(const TextRun& run) const
{
UniscribeStateTextRun state(run, *this);
return static_cast<float>(state.Width());
}
int Font::offsetForPositionForComplexText(const TextRun& run, int x, bool includePartialGlyphs) const
{
// Mac code ignores includePartialGlyphs, and they don't know what it's
// supposed to do, so we just ignore it as well.
UniscribeStateTextRun state(run, *this);
int char_index = state.XToCharacter(x);
// XToCharacter will return -1 if the position is before the first
// character (we get called like this sometimes).
if (char_index < 0)
char_index = 0;
return char_index;
}
}
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