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/*
* Copyright 2009, The Android Open Source Project
* Copyright (C) 2006 Apple Computer, 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:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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 THE COPYRIGHT HOLDERS ``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 THE COPYRIGHT OWNER 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 "EmojiFont.h"
#include "Font.h"
#include "FontData.h"
#include "FontFallbackList.h"
#include "GraphicsContext.h"
#include "GlyphBuffer.h"
#include "IntRect.h"
#include "PlatformGraphicsContext.h"
#include "SkCanvas.h"
#include "SkLayerDrawLooper.h"
#include "SkPaint.h"
#include "SkTemplates.h"
#include "SkTypeface.h"
#include "SkUtils.h"
using namespace android;
namespace WebCore {
static void updateForFont(SkPaint* paint, const SimpleFontData* font) {
font->platformData().setupPaint(paint);
paint->setTextEncoding(SkPaint::kGlyphID_TextEncoding);
}
static SkPaint* setupFill(SkPaint* paint, GraphicsContext* gc,
const SimpleFontData* font) {
gc->setupFillPaint(paint);
updateForFont(paint, font);
return paint;
}
static SkPaint* setupStroke(SkPaint* paint, GraphicsContext* gc,
const SimpleFontData* font) {
gc->setupStrokePaint(paint);
updateForFont(paint, font);
return paint;
}
static bool setupForText(SkPaint* paint, GraphicsContext* gc,
const SimpleFontData* font) {
int mode = gc->textDrawingMode();
if ((mode & (cTextFill | cTextStroke)) == (cTextFill | cTextStroke)) {
SkLayerDrawLooper* looper = new SkLayerDrawLooper;
paint->setLooper(looper)->unref();
// Specify the behavior of the looper
SkLayerDrawLooper::LayerInfo info;
info.fPaintBits = SkLayerDrawLooper::kEntirePaint_Bits;
info.fColorMode = SkXfermode::kSrc_Mode;
// we clear the looper, in case we have a shadow
SkPaint* fillP = NULL;
SkPaint* strokeP = NULL;
if (gc->willStroke()) {
strokeP = setupStroke(looper->addLayer(info), gc, font);
}
if (gc->willFill()) {
fillP = setupFill(looper->addLayer(info), gc, font);
}
SkPaint shadowPaint;
SkPoint offset;
if (gc->setupShadowPaint(&shadowPaint, &offset)) {
// add an offset to the looper when creating a shadow layer
info.fOffset.set(offset.fX, offset.fY);
SkPaint* p = looper->addLayer(info);
*p = shadowPaint;
if (strokeP && !fillP) {
// stroke the shadow if we have stroke but no fill
p->setStyle(SkPaint::kStroke_Style);
p->setStrokeWidth(strokeP->getStrokeWidth());
}
updateForFont(p, font);
}
} else if (mode & cTextFill) {
(void)setupFill(paint, gc, font);
} else if (mode & cTextStroke) {
(void)setupStroke(paint, gc, font);
} else {
return false;
}
return true;
}
bool Font::canReturnFallbackFontsForComplexText()
{
return false;
}
void Font::drawGlyphs(GraphicsContext* gc, const SimpleFontData* font,
const GlyphBuffer& glyphBuffer, int from, int numGlyphs,
const FloatPoint& point) const
{
// compile-time assert
SkASSERT(sizeof(GlyphBufferGlyph) == sizeof(uint16_t));
SkPaint paint;
if (!setupForText(&paint, gc, font)) {
return;
}
SkScalar x = SkFloatToScalar(point.x());
SkScalar y = SkFloatToScalar(point.y());
const GlyphBufferGlyph* glyphs = glyphBuffer.glyphs(from);
const GlyphBufferAdvance* adv = glyphBuffer.advances(from);
SkAutoSTMalloc<32, SkPoint> storage(numGlyphs);
SkPoint* pos = storage.get();
SkCanvas* canvas = gc->platformContext()->mCanvas;
/* We need an array of [x,y,x,y,x,y,...], but webkit is giving us
point.xy + [width, height, width, height, ...], so we have to convert
*/
if (EmojiFont::IsAvailable()) {
// set filtering, to make scaled images look nice(r)
paint.setFilterBitmap(true);
int localIndex = 0;
int localCount = 0;
for (int i = 0; i < numGlyphs; i++) {
if (EmojiFont::IsEmojiGlyph(glyphs[i])) {
if (localCount)
canvas->drawPosText(&glyphs[localIndex],
localCount * sizeof(uint16_t),
&pos[localIndex], paint);
EmojiFont::Draw(canvas, glyphs[i], x, y, paint);
// reset local index/count track for "real" glyphs
localCount = 0;
localIndex = i + 1;
} else {
pos[i].set(x, y);
localCount += 1;
}
x += SkFloatToScalar(adv[i].width());
y += SkFloatToScalar(adv[i].height());
}
// draw the last run of glyphs (if any)
if (localCount)
canvas->drawPosText(&glyphs[localIndex],
localCount * sizeof(uint16_t),
&pos[localIndex], paint);
} else {
for (int i = 0; i < numGlyphs; i++) {
pos[i].set(x, y);
x += SkFloatToScalar(adv[i].width());
y += SkFloatToScalar(adv[i].height());
}
canvas->drawPosText(glyphs, numGlyphs * sizeof(uint16_t), pos, paint);
}
}
FloatRect Font::selectionRectForComplexText(const TextRun& run,
const IntPoint& point, int h, int, int) const
{
SkPaint paint;
SkScalar width, left;
SkPaint::FontMetrics metrics;
primaryFont()->platformData().setupPaint(&paint);
width = paint.measureText(run.characters(), run.length() << 1);
SkScalar spacing = paint.getFontMetrics(&metrics);
return FloatRect(point.x(),
point.y(),
roundf(SkScalarToFloat(width)),
roundf(SkScalarToFloat(spacing)));
}
void Font::drawComplexText(GraphicsContext* gc, TextRun const& run,
FloatPoint const& point, int, int) const
{
SkCanvas* canvas = gc->platformContext()->mCanvas;
SkPaint paint;
if (!setupForText(&paint, gc, primaryFont())) {
return;
}
// go to chars, instead of glyphs, which was set by setupForText()
paint.setTextEncoding(SkPaint::kUTF16_TextEncoding);
canvas->drawText(run.characters(), run.length() << 1,
SkFloatToScalar(point.x()), SkFloatToScalar(point.y()),
paint);
}
float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>*) const
{
SkPaint paint;
primaryFont()->platformData().setupPaint(&paint);
//printf("--------- complext measure %d chars\n", run.to() - run.from());
SkScalar width = paint.measureText(run.characters(), run.length() << 1);
return SkScalarToFloat(width);
}
int Font::offsetForPositionForComplexText(const TextRun& run, int x,
bool includePartialGlyphs) const
{
SkPaint paint;
int count = run.length();
SkAutoSTMalloc<64, SkScalar> storage(count);
SkScalar* widths = storage.get();
primaryFont()->platformData().setupPaint(&paint);
count = paint.getTextWidths(run.characters(), count << 1, widths);
if (count > 0)
{
SkScalar pos = 0;
for (int i = 0; i < count; i++)
{
if (x < SkScalarRound(pos + SkScalarHalf(widths[i])))
return i;
pos += widths[i];
}
}
return count;
}
}
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