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/*
* Copyright 2010 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkGr.h"
#include "SkDescriptor.h"
#include "SkGlyphCache.h"
class SkGrDescKey : public GrKey {
public:
explicit SkGrDescKey(const SkDescriptor& desc);
virtual ~SkGrDescKey();
protected:
// overrides
virtual bool lt(const GrKey& rh) const;
virtual bool eq(const GrKey& rh) const;
private:
SkDescriptor* fDesc;
enum {
kMaxStorageInts = 16
};
uint32_t fStorage[kMaxStorageInts];
};
///////////////////////////////////////////////////////////////////////////////
SkGrDescKey::SkGrDescKey(const SkDescriptor& desc) : GrKey(desc.getChecksum()) {
size_t size = desc.getLength();
if (size <= sizeof(fStorage)) {
fDesc = GrTCast<SkDescriptor*>(fStorage);
} else {
fDesc = SkDescriptor::Alloc(size);
}
memcpy(fDesc, &desc, size);
}
SkGrDescKey::~SkGrDescKey() {
if (fDesc != GrTCast<SkDescriptor*>(fStorage)) {
SkDescriptor::Free(fDesc);
}
}
bool SkGrDescKey::lt(const GrKey& rh) const {
const SkDescriptor* srcDesc = ((const SkGrDescKey*)&rh)->fDesc;
size_t lenLH = fDesc->getLength();
size_t lenRH = srcDesc->getLength();
int cmp = memcmp(fDesc, srcDesc, SkMin32(lenLH, lenRH));
if (0 == cmp) {
return lenLH < lenRH;
} else {
return cmp < 0;
}
}
bool SkGrDescKey::eq(const GrKey& rh) const {
const SkDescriptor* srcDesc = ((const SkGrDescKey*)&rh)->fDesc;
return fDesc->equals(*srcDesc);
}
///////////////////////////////////////////////////////////////////////////////
SkGrFontScaler::SkGrFontScaler(SkGlyphCache* strike) {
fStrike = strike;
fKey = NULL;
}
SkGrFontScaler::~SkGrFontScaler() {
GrSafeUnref(fKey);
}
GrMaskFormat SkGrFontScaler::getMaskFormat() {
SkMask::Format format = fStrike->getMaskFormat();
switch (format) {
case SkMask::kBW_Format:
// fall through to kA8 -- we store BW glyphs in our 8-bit cache
case SkMask::kA8_Format:
return kA8_GrMaskFormat;
case SkMask::kLCD16_Format:
return kA565_GrMaskFormat;
case SkMask::kLCD32_Format:
return kA888_GrMaskFormat;
default:
GrAssert(!"unsupported SkMask::Format");
return kA8_GrMaskFormat;
}
}
const GrKey* SkGrFontScaler::getKey() {
if (NULL == fKey) {
fKey = new SkGrDescKey(fStrike->getDescriptor());
}
return fKey;
}
bool SkGrFontScaler::getPackedGlyphBounds(GrGlyph::PackedID packed,
GrIRect* bounds) {
const SkGlyph& glyph = fStrike->getGlyphIDMetrics(GrGlyph::UnpackID(packed),
GrGlyph::UnpackFixedX(packed),
GrGlyph::UnpackFixedY(packed));
bounds->setXYWH(glyph.fLeft, glyph.fTop, glyph.fWidth, glyph.fHeight);
return true;
}
static void bits_to_bytes(const uint8_t bits[], uint8_t bytes[], int count) {
while (count > 0) {
unsigned mask = *bits++;
for (int i = 7; i >= 0; --i) {
*bytes++ = (mask & (1 << i)) ? 0xFF : 0;
if (--count == 0) {
return;
}
}
}
}
bool SkGrFontScaler::getPackedGlyphImage(GrGlyph::PackedID packed,
int width, int height,
int dstRB, void* dst) {
const SkGlyph& glyph = fStrike->getGlyphIDMetrics(GrGlyph::UnpackID(packed),
GrGlyph::UnpackFixedX(packed),
GrGlyph::UnpackFixedY(packed));
GrAssert(glyph.fWidth == width);
GrAssert(glyph.fHeight == height);
const void* src = fStrike->findImage(glyph);
if (NULL == src) {
return false;
}
int srcRB = glyph.rowBytes();
if (SkMask::kBW_Format == fStrike->getMaskFormat()) {
// expand bits to bytes
const uint8_t* bits = reinterpret_cast<const uint8_t*>(src);
uint8_t* bytes = reinterpret_cast<uint8_t*>(dst);
for (int y = 0; y < height; y++) {
bits_to_bytes(bits, bytes, width);
bits += srcRB;
bytes += dstRB;
}
} else if (srcRB == dstRB) {
memcpy(dst, src, dstRB * height);
} else {
const int bbp = GrMaskFormatBytesPerPixel(this->getMaskFormat());
for (int y = 0; y < height; y++) {
memcpy(dst, src, width * bbp);
src = (const char*)src + srcRB;
dst = (char*)dst + dstRB;
}
}
return true;
}
// we should just return const SkPath* (NULL means false)
bool SkGrFontScaler::getGlyphPath(uint16_t glyphID, GrPath* path) {
const SkGlyph& glyph = fStrike->getGlyphIDMetrics(glyphID);
const SkPath* skPath = fStrike->findPath(glyph);
if (skPath) {
*path = *skPath;
return true;
}
return false;
}
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