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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "SkPaint.h"
#include "SkPDFFont.h"
#include "SkUtils.h"
namespace {
uint16_t unicharToWinAnsiGlyphID(SkUnichar uniChar) {
// TODO(vandebo) Quick hack to get text working. Either finish the
// implementation of this, or remove it and use the encoding built into
// the real font.
if (uniChar < ' ')
return 0;
if (uniChar < '~')
return uniChar;
return 0;
}
}
SkPDFFont::~SkPDFFont() {
SkAutoMutexAcquire lock(canonicalFontsMutex());
int index = find(fFontID);
SkASSERT(index >= 0);
canonicalFonts().removeShuffle(index);
}
void SkPDFFont::getResources(SkTDArray<SkPDFObject*>* resourceList) {
resourceList->setReserve(resourceList->count() + fResources.count());
for (int i = 0; i < fResources.count(); i++) {
resourceList->push(fResources[i]);
fResources[i]->ref();
fResources[i]->getResources(resourceList);
}
}
uint32_t SkPDFFont::fontID() {
return fFontID;
}
bool SkPDFFont::multiByteGlyphs() {
return fMultiByteGlyphs;
}
// TODO(vandebo) This function goes or stays with unicharToWinAnsiGlyphID.
int SkPDFFont::textToPDFGlyphs(const void* text, size_t byteLength,
const SkPaint& paint, uint16_t glyphs[],
size_t glyphsLength) const {
// For a regular, non built-in font, just ask the paint.
if (fResources.count() != 0) {
SkASSERT(glyphsLength >= byteLength / 2);
if (paint.getTextEncoding() == SkPaint::kGlyphID_TextEncoding) {
memcpy(glyphs, text, byteLength / 2 * 2);
return byteLength / 2;
} else {
return paint.textToGlyphs(text, byteLength, glyphs);
}
}
const char* data = (const char*)text;
const char* stop = data + byteLength;
const uint16_t* data16 = (const uint16_t*)data;
const uint16_t* stop16 = (const uint16_t*)stop;
uint16_t* gPtr = glyphs;
uint16_t* gEnd = glyphs + glyphsLength;
// For a built-in font (no resources), we may have to undo glyph encoding
// before converting to the standard pdf encoding.
switch(paint.getTextEncoding()) {
case SkPaint::kUTF8_TextEncoding:
while (data < stop && gPtr < gEnd)
*gPtr++ = unicharToWinAnsiGlyphID(SkUTF8_NextUnichar(&data));
SkASSERT(data >= stop);
break;
case SkPaint::kUTF16_TextEncoding:
while (data16 < stop16 && gPtr < gEnd)
*gPtr++ = unicharToWinAnsiGlyphID(SkUTF16_NextUnichar(&data16));
SkASSERT(data16 >= stop16);
break;
case SkPaint::kGlyphID_TextEncoding:
while (data16 < stop16 && gPtr < gEnd) {
SkUnichar buf;
paint.glyphsToUnichars(data16++, 1, &buf);
*gPtr++ = unicharToWinAnsiGlyphID(buf);
}
SkASSERT(data16 >= stop16);
break;
default:
SkASSERT(!"Unknown text encoding");
break;
}
return gPtr - glyphs;
}
// static
SkPDFFont* SkPDFFont::getFontResouceByID(uint32_t fontID) {
SkAutoMutexAcquire lock(canonicalFontsMutex());
int index = find(fontID);
if (index >= 0) {
canonicalFonts()[index].fFont->ref();
return canonicalFonts()[index].fFont;
}
// TODO(vandebo) Lookup and create the font. For now, just use the built-in
// Helevtica.
SkPDFFont* font = new SkPDFFont(fontID, false);
font->populateBuiltinFont("Helvetica");
FontRec newEntry(font, fontID);
canonicalFonts().push(newEntry);
return font; // Return the reference new SkPDFFont() created.
}
// static
SkTDArray<SkPDFFont::FontRec>& SkPDFFont::canonicalFonts() {
// This initialization is only thread safe with gcc.
static SkTDArray<FontRec> gCanonicalFonts;
return gCanonicalFonts;
}
// static
SkMutex& SkPDFFont::canonicalFontsMutex() {
// This initialization is only thread safe with gcc.
static SkMutex gCanonicalFontsMutex;
return gCanonicalFontsMutex;
}
// static
int SkPDFFont::find(uint32_t fontID) {
FontRec search(NULL, fontID);
return canonicalFonts().find(search);
}
SkPDFFont::SkPDFFont(uint32_t fontID, bool multiByteGlyphs)
: fFontID(fontID),
fMultiByteGlyphs(multiByteGlyphs) {
}
void SkPDFFont::populateBuiltinFont(const char fontName[]) {
SkASSERT(strcmp(fontName, "Time-Roman") == 0 ||
strcmp(fontName, "Time-Bold") == 0 ||
strcmp(fontName, "Time-Italic") == 0 ||
strcmp(fontName, "Time-BoldItalic") == 0 ||
strcmp(fontName, "Helvetica") == 0 ||
strcmp(fontName, "Helvetica-Bold") == 0 ||
strcmp(fontName, "Helvetica-Oblique") == 0 ||
strcmp(fontName, "Helvetica-BoldOblique") == 0 ||
strcmp(fontName, "Courier") == 0 ||
strcmp(fontName, "Courier-Bold") == 0 ||
strcmp(fontName, "Courier-Oblique") == 0 ||
strcmp(fontName, "Courier-BoldOblique") == 0 ||
strcmp(fontName, "Symbol") == 0 ||
strcmp(fontName, "ZapfDingbats") == 0);
SkRefPtr<SkPDFName> type = new SkPDFName("Font");
type->unref(); // SkRefPtr and new both took a reference.
insert("Type", type.get());
SkRefPtr<SkPDFName> subType = new SkPDFName("Type1");
subType->unref(); // SkRefPtr and new both took a reference.
insert("Subtype", subType.get());
SkRefPtr<SkPDFName> baseFont = new SkPDFName(fontName);
baseFont->unref(); // SkRefPtr and new both took a reference.
insert("BaseFont", baseFont.get());
SkRefPtr<SkPDFName> encoding = new SkPDFName("WinAnsiEncoding");
encoding->unref(); // SkRefPtr and new both took a reference.
insert("Encoding", encoding.get());
}
void SkPDFFont::populateFont(const char subType[], const char fontName[],
int firstChar, int lastChar, int widths[],
SkPDFObject* fontDescriptor) {
}
bool SkPDFFont::FontRec::operator==(const SkPDFFont::FontRec& b) const {
return fFontID == b.fFontID;
}
SkPDFFont::FontRec::FontRec(SkPDFFont* font, uint32_t fontID)
: fFont(font),
fFontID(fontID) {
}
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