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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 "ChromiumBridge.h"
#include "Font.h"
#include "FontFallbackList.h"
#include "GlyphBuffer.h"
#include "PlatformContextSkia.h"
#include "SimpleFontData.h"
#include "SkiaUtils.h"
#include "UniscribeHelperTextRun.h"
#include "skia/ext/platform_canvas_win.h"
#include "skia/ext/skia_utils_win.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();
// 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;
SkColor color = context->fillColor();
unsigned char alpha = SkColorGetA(color);
// Skip 100% transparent text; no need to draw anything.
if (!alpha)
return;
// Set up our graphics context.
HDC hdc = context->canvas()->beginPlatformPaint();
HGDIOBJ oldFont = SelectObject(hdc, font->platformData().hfont());
// TODO(maruel): http://b/700464 SetTextColor doesn't support transparency.
// Enforce non-transparent color.
color = SkColorSetRGB(SkColorGetR(color),
SkColorGetG(color),
SkColorGetB(color));
SetTextColor(hdc, skia::SkColorToCOLORREF(color));
SetBkMode(hdc, TRANSPARENT);
// Windows needs the characters and the advances in nice contiguous
// buffers, which we build here.
Vector<WORD, kDefaultBufferLength> glyphs;
Vector<int, kDefaultBufferLength> advances;
// Compute the coordinate. The 'origin' represents the baseline, so we need
// to move it up to the top of the bounding square.
int x = static_cast<int>(point.x());
int lineTop = static_cast<int>(point.y()) - font->ascent();
// 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 glyphIndex = 0;
while (glyphIndex < numGlyphs) {
// how many chars will be in this chunk?
int curLen = std::min(kMaxBufferLength, numGlyphs - glyphIndex);
glyphs.resize(curLen);
advances.resize(curLen);
int curWidth = 0;
for (int i = 0; i < curLen; ++i, ++glyphIndex) {
glyphs[i] = glyphBuffer.glyphAt(from + glyphIndex);
advances[i] =
static_cast<int>(glyphBuffer.advanceAt(from + glyphIndex));
curWidth += advances[i];
}
bool success = false;
for (int executions = 0; executions < 2; ++executions) {
success = !!ExtTextOut(hdc, x, lineTop, ETO_GLYPH_INDEX, NULL,
reinterpret_cast<const wchar_t*>(&glyphs[0]),
curLen,
&advances[0]);
if (!success && executions == 0) {
// Ask the browser to load the font for us and retry.
ChromiumBridge::ensureFontLoaded(font->platformData().hfont());
continue;
}
break;
}
ASSERT(success);
x += curWidth;
}
SelectObject(hdc, oldFont);
context->canvas()->endPlatformPaint();
}
FloatRect Font::selectionRectForComplexText(const TextRun& run,
const IntPoint& point,
int h,
int from,
int to) const
{
UniscribeHelperTextRun 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* graphicsContext,
const TextRun& run,
const FloatPoint& point,
int from,
int to) const
{
PlatformGraphicsContext* context = graphicsContext->platformContext();
UniscribeHelperTextRun state(run, *this);
SkColor color = context->fillColor();
uint8 alpha = SkColorGetA(color);
// Skip 100% transparent text; no need to draw anything.
if (!alpha)
return;
HDC hdc = context->canvas()->beginPlatformPaint();
// TODO(maruel): http://b/700464 SetTextColor doesn't support transparency.
// Enforce non-transparent color.
color = SkColorSetRGB(SkColorGetR(color),
SkColorGetG(color),
SkColorGetB(color));
SetTextColor(hdc, skia::SkColorToCOLORREF(color));
SetBkMode(hdc, TRANSPARENT);
// Uniscribe counts the coordinates from the upper left, while WebKit uses
// the baseline, so we have to subtract off the ascent.
state.Draw(hdc,
static_cast<int>(point.x()),
static_cast<int>(point.y() - ascent()),
from,
to);
context->canvas()->endPlatformPaint();
}
float Font::floatWidthForComplexText(const TextRun& run) const
{
UniscribeHelperTextRun 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.
UniscribeHelperTextRun 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;
}
} // namespace WebCore
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