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/*
* Copyright (C) 2012 Google 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 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.
*/
#include "config.h"
#include "CompositorHUDFontAtlas.h"
#include "Font.h"
#include "FontCache.h"
#include "FontDescription.h"
#include "GraphicsContext.h"
#include "PlatformContextSkia.h"
#include "SkCanvas.h"
#include "SkDevice.h"
#include "TextRun.h"
#include "skia/ext/platform_canvas.h"
using WebKit::WebRect;
namespace WebCore {
#define ATLAS_SIZE 128
static void wrapPositionIfNeeded(IntPoint& position, int textWidth, int textHeight)
{
if (position.x() + textWidth > ATLAS_SIZE)
position = IntPoint(0, position.y() + textHeight);
}
// Paints the font into the atlas, from left-to-right, top-to-bottom, starting at
// startingPosition. At the same time, it updates the ascii-to-WebRect mapping for
// each character. By doing things this way, it is possible to support variable-width
// fonts and multiple fonts on the same atlas.
SkBitmap CompositorHUDFontAtlas::generateFontAtlas(WebRect asciiToRectTable[128], int& fontHeight)
{
fontHeight = 14;
OwnPtr<SkCanvas> canvas = adoptPtr(skia::CreateBitmapCanvas(ATLAS_SIZE, ATLAS_SIZE, false /* opaque */));
PlatformContextSkia platformContext(canvas.get());
platformContext.setDrawingToImageBuffer(true);
GraphicsContext atlasContext(&platformContext);
// Clear the entire texture atlas to transparent before drawing fonts.
atlasContext.setFillColor(Color(0, 0, 0, 0), ColorSpaceDeviceRGB);
atlasContext.clearRect(FloatRect(0, 0, ATLAS_SIZE, ATLAS_SIZE));
// FIXME: monospace font does not work as expected.
FontDescription fontDescription;
fontDescription.setGenericFamily(FontDescription::MonospaceFamily);
fontDescription.setComputedSize(fontHeight);
FontCachePurgePreventer fontCachePurgePreventer;
int textHeight = fontDescription.computedPixelSize();
IntPoint position(0, textHeight);
// This is a dirty little trick to account for overhang letters like g, p, j.
int inflation = textHeight / 3;
Font font(fontDescription, 0, 0);
font.update(0);
Color fontColor(255, 0, 0);
atlasContext.setStrokeColor(fontColor, ColorSpaceDeviceRGB);
atlasContext.setFillColor(fontColor, ColorSpaceDeviceRGB);
// First, draw a generic rect that will be used for special and unknown characters that have nothing else to render.
{
int textWidth = textHeight / 2;
wrapPositionIfNeeded(position, textWidth, textHeight + inflation);
atlasContext.strokeRect(FloatRect(FloatPoint(position.x() + 1, position.y() - textHeight + 1 + inflation), FloatSize(textWidth - 2, textHeight - 2 - inflation)), 1);
// Initialize the rect that would be copied when drawing this glyph from the atlas.
asciiToRectTable[0] = WebRect(position.x(), position.y() - textHeight, textWidth, textHeight + inflation);
// Increment to the position where the next glyph will be placed.
position.setX(position.x() + textWidth);
}
// Then, draw the ASCII characters.
for (LChar i = 1; i < 128; ++i) {
if (i < 32) {
// Special characters will simply use the the default glyph.
asciiToRectTable[i] = asciiToRectTable[0];
continue;
}
String str;
str.append(i);
TextRun text(str);
int textWidth = round(font.width(text));
wrapPositionIfNeeded(position, textWidth, textHeight + inflation);
atlasContext.drawText(font, text, position);
// Initialize the rect that would be copied when drawing this glyph from the atlas.
asciiToRectTable[i] = WebRect(position.x(), position.y() - textHeight, textWidth, textHeight + inflation);
// Increment to the position where the next glyph will be placed.
position.setX(position.x() + textWidth);
}
SkBitmap copy;
const SkBitmap& source = canvas->getDevice()->accessBitmap(false);
source.copyTo(©, source.config());
return copy;
}
} // namespace WebCore
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