/* libs/graphics/sgl/SkPaint.cpp
**
** Copyright 2006, 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 "SkColorFilter.h"
#include "SkDrawLooper.h"
#include "SkFontHost.h"
#include "SkMaskFilter.h"
#include "SkPathEffect.h"
#include "SkRasterizer.h"
#include "SkShader.h"
#include "SkScalerContext.h"
#include "SkStroke.h"
#include "SkTypeface.h"
#include "SkXfermode.h"
#include "SkAutoKern.h"
#define SK_DefaultTextSize SkIntToScalar(12)
#define SK_DefaultFlags 0 //(kNativeHintsText_Flag)
SkPaint::SkPaint() {
// since we may have padding, we zero everything so that our memcmp() call
// in operator== will work correctly.
// with this, we can skip 0 and null individual initializations
sk_bzero(this, sizeof(*this));
#if 0 // not needed with the bzero call above
fTypeface = NULL;
fTextSkewX = 0;
fPathEffect = NULL;
fShader = NULL;
fXfermode = NULL;
fMaskFilter = NULL;
fColorFilter = NULL;
fRasterizer = NULL;
fLooper = NULL;
fWidth = 0;
#endif
fTextSize = SK_DefaultTextSize;
fTextScaleX = SK_Scalar1;
fColor = SK_ColorBLACK;
fMiterLimit = SK_DefaultMiterLimit;
fFlags = SK_DefaultFlags;
fCapType = kDefault_Cap;
fJoinType = kDefault_Join;
fTextAlign = kLeft_Align;
fStyle = kFill_Style;
fTextEncoding = kUTF8_TextEncoding;
fHinting = kNormal_Hinting;
}
SkPaint::SkPaint(const SkPaint& src)
{
memcpy(this, &src, sizeof(src));
fTypeface->safeRef();
fPathEffect->safeRef();
fShader->safeRef();
fXfermode->safeRef();
fMaskFilter->safeRef();
fColorFilter->safeRef();
fRasterizer->safeRef();
fLooper->safeRef();
}
SkPaint::~SkPaint()
{
fTypeface->safeUnref();
fPathEffect->safeUnref();
fShader->safeUnref();
fXfermode->safeUnref();
fMaskFilter->safeUnref();
fColorFilter->safeUnref();
fRasterizer->safeUnref();
fLooper->safeUnref();
}
SkPaint& SkPaint::operator=(const SkPaint& src)
{
SkASSERT(&src);
src.fTypeface->safeRef();
src.fPathEffect->safeRef();
src.fShader->safeRef();
src.fXfermode->safeRef();
src.fMaskFilter->safeRef();
src.fColorFilter->safeRef();
src.fRasterizer->safeRef();
src.fLooper->safeRef();
fTypeface->safeUnref();
fPathEffect->safeUnref();
fShader->safeUnref();
fXfermode->safeUnref();
fMaskFilter->safeUnref();
fColorFilter->safeUnref();
fRasterizer->safeUnref();
fLooper->safeUnref();
memcpy(this, &src, sizeof(src));
return *this;
}
int operator==(const SkPaint& a, const SkPaint& b)
{
return memcmp(&a, &b, sizeof(a)) == 0;
}
void SkPaint::reset()
{
SkPaint init;
*this = init;
}
void SkPaint::setFlags(uint32_t flags)
{
fFlags = flags;
}
void SkPaint::setAntiAlias(bool doAA)
{
this->setFlags(SkSetClearMask(fFlags, doAA, kAntiAlias_Flag));
}
void SkPaint::setDither(bool doDither)
{
this->setFlags(SkSetClearMask(fFlags, doDither, kDither_Flag));
}
void SkPaint::setSubpixelText(bool doSubpixel)
{
this->setFlags(SkSetClearMask(fFlags, doSubpixel, kSubpixelText_Flag));
}
void SkPaint::setLCDRenderText(bool doLCDRender)
{
this->setFlags(SkSetClearMask(fFlags, doLCDRender, kLCDRenderText_Flag));
}
void SkPaint::setEmbeddedBitmapText(bool doEmbeddedBitmapText)
{
this->setFlags(SkSetClearMask(fFlags, doEmbeddedBitmapText, kEmbeddedBitmapText_Flag));
}
void SkPaint::setLinearText(bool doLinearText)
{
this->setFlags(SkSetClearMask(fFlags, doLinearText, kLinearText_Flag));
}
void SkPaint::setUnderlineText(bool doUnderline)
{
this->setFlags(SkSetClearMask(fFlags, doUnderline, kUnderlineText_Flag));
}
void SkPaint::setStrikeThruText(bool doStrikeThru)
{
this->setFlags(SkSetClearMask(fFlags, doStrikeThru, kStrikeThruText_Flag));
}
void SkPaint::setFakeBoldText(bool doFakeBold)
{
this->setFlags(SkSetClearMask(fFlags, doFakeBold, kFakeBoldText_Flag));
}
void SkPaint::setDevKernText(bool doDevKern)
{
this->setFlags(SkSetClearMask(fFlags, doDevKern, kDevKernText_Flag));
}
void SkPaint::setFilterBitmap(bool doFilter)
{
this->setFlags(SkSetClearMask(fFlags, doFilter, kFilterBitmap_Flag));
}
void SkPaint::setStyle(Style style)
{
if ((unsigned)style < kStyleCount)
fStyle = style;
#ifdef SK_DEBUG
else
SkDebugf("SkPaint::setStyle(%d) out of range\n", style);
#endif
}
void SkPaint::setColor(SkColor color)
{
fColor = color;
}
void SkPaint::setAlpha(U8CPU a)
{
fColor = SkColorSetARGB(a, SkColorGetR(fColor), SkColorGetG(fColor), SkColorGetB(fColor));
}
void SkPaint::setARGB(U8CPU a, U8CPU r, U8CPU g, U8CPU b)
{
fColor = SkColorSetARGB(a, r, g, b);
}
void SkPaint::setStrokeWidth(SkScalar width)
{
if (width >= 0)
fWidth = width;
#ifdef SK_DEBUG
else
SkDebugf("SkPaint::setStrokeWidth() called with negative value\n");
#endif
}
void SkPaint::setStrokeMiter(SkScalar limit)
{
if (limit >= 0)
fMiterLimit = limit;
#ifdef SK_DEBUG
else
SkDebugf("SkPaint::setStrokeMiter() called with negative value\n");
#endif
}
void SkPaint::setStrokeCap(Cap ct)
{
if ((unsigned)ct < kCapCount)
fCapType = SkToU8(ct);
#ifdef SK_DEBUG
else
SkDebugf("SkPaint::setStrokeCap(%d) out of range\n", ct);
#endif
}
void SkPaint::setStrokeJoin(Join jt)
{
if ((unsigned)jt < kJoinCount)
fJoinType = SkToU8(jt);
#ifdef SK_DEBUG
else
SkDebugf("SkPaint::setStrokeJoin(%d) out of range\n", jt);
#endif
}
//////////////////////////////////////////////////////////////////
void SkPaint::setTextAlign(Align align)
{
if ((unsigned)align < kAlignCount)
fTextAlign = SkToU8(align);
#ifdef SK_DEBUG
else
SkDebugf("SkPaint::setTextAlign(%d) out of range\n", align);
#endif
}
void SkPaint::setTextSize(SkScalar ts)
{
if (ts > 0)
fTextSize = ts;
#ifdef SK_DEBUG
else
SkDebugf("SkPaint::setTextSize() called with non-positive value\n");
#endif
}
void SkPaint::setTextScaleX(SkScalar scaleX)
{
fTextScaleX = scaleX;
}
void SkPaint::setTextSkewX(SkScalar skewX)
{
fTextSkewX = skewX;
}
void SkPaint::setTextEncoding(TextEncoding encoding)
{
if ((unsigned)encoding <= kGlyphID_TextEncoding)
fTextEncoding = encoding;
#ifdef SK_DEBUG
else
SkDebugf("SkPaint::setTextEncoding(%d) out of range\n", encoding);
#endif
}
///////////////////////////////////////////////////////////////////////////////////////
SkTypeface* SkPaint::setTypeface(SkTypeface* font)
{
SkRefCnt_SafeAssign(fTypeface, font);
return font;
}
SkRasterizer* SkPaint::setRasterizer(SkRasterizer* r)
{
SkRefCnt_SafeAssign(fRasterizer, r);
return r;
}
SkDrawLooper* SkPaint::setLooper(SkDrawLooper* looper)
{
SkRefCnt_SafeAssign(fLooper, looper);
return looper;
}
///////////////////////////////////////////////////////////////////////////////
#include "SkGlyphCache.h"
#include "SkUtils.h"
int SkPaint::textToGlyphs(const void* textData, size_t byteLength,
uint16_t glyphs[]) const {
if (byteLength == 0) {
return 0;
}
SkASSERT(textData != NULL);
if (NULL == glyphs) {
switch (this->getTextEncoding()) {
case kUTF8_TextEncoding:
return SkUTF8_CountUnichars((const char*)textData, byteLength);
case kUTF16_TextEncoding:
return SkUTF16_CountUnichars((const uint16_t*)textData,
byteLength >> 1);
case kGlyphID_TextEncoding:
return byteLength >> 1;
default:
SkASSERT(!"unknown text encoding");
}
return 0;
}
// if we get here, we have a valid glyphs[] array, so time to fill it in
// handle this encoding before the setup for the glyphcache
if (this->getTextEncoding() == kGlyphID_TextEncoding) {
// we want to ignore the low bit of byteLength
memcpy(glyphs, textData, byteLength >> 1 << 1);
return byteLength >> 1;
}
SkAutoGlyphCache autoCache(*this, NULL);
SkGlyphCache* cache = autoCache.getCache();
const char* text = (const char*)textData;
const char* stop = text + byteLength;
uint16_t* gptr = glyphs;
switch (this->getTextEncoding()) {
case SkPaint::kUTF8_TextEncoding:
while (text < stop) {
*gptr++ = cache->unicharToGlyph(SkUTF8_NextUnichar(&text));
}
break;
case SkPaint::kUTF16_TextEncoding: {
const uint16_t* text16 = (const uint16_t*)text;
const uint16_t* stop16 = (const uint16_t*)stop;
while (text16 < stop16) {
*gptr++ = cache->unicharToGlyph(SkUTF16_NextUnichar(&text16));
}
break;
}
default:
SkASSERT(!"unknown text encoding");
}
return gptr - glyphs;
}
bool SkPaint::containsText(const void* textData, size_t byteLength) const {
if (0 == byteLength) {
return true;
}
SkASSERT(textData != NULL);
// handle this encoding before the setup for the glyphcache
if (this->getTextEncoding() == kGlyphID_TextEncoding) {
const uint16_t* glyphID = static_cast<const uint16_t*>(textData);
size_t count = byteLength >> 1;
for (size_t i = 0; i < count; i++) {
if (0 == glyphID[i]) {
return false;
}
}
return true;
}
SkAutoGlyphCache autoCache(*this, NULL);
SkGlyphCache* cache = autoCache.getCache();
switch (this->getTextEncoding()) {
case SkPaint::kUTF8_TextEncoding: {
const char* text = static_cast<const char*>(textData);
const char* stop = text + byteLength;
while (text < stop) {
if (0 == cache->unicharToGlyph(SkUTF8_NextUnichar(&text))) {
return false;
}
}
break;
}
case SkPaint::kUTF16_TextEncoding: {
const uint16_t* text = static_cast<const uint16_t*>(textData);
const uint16_t* stop = text + (byteLength >> 1);
while (text < stop) {
if (0 == cache->unicharToGlyph(SkUTF16_NextUnichar(&text))) {
return false;
}
}
break;
}
default:
SkASSERT(!"unknown text encoding");
return false;
}
return true;
}
void SkPaint::glyphsToUnichars(const uint16_t glyphs[], int count,
SkUnichar textData[]) const {
if (count <= 0) {
return;
}
SkASSERT(glyphs != NULL);
SkASSERT(textData != NULL);
SkAutoGlyphCache autoCache(*this, NULL);
SkGlyphCache* cache = autoCache.getCache();
for (int index = 0; index < count; index++) {
textData[index] = cache->glyphToUnichar(glyphs[index]);
}
}
///////////////////////////////////////////////////////////////////////////////
static const SkGlyph& sk_getMetrics_utf8_next(SkGlyphCache* cache, const char** text)
{
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
return cache->getUnicharMetrics(SkUTF8_NextUnichar(text));
}
static const SkGlyph& sk_getMetrics_utf8_prev(SkGlyphCache* cache, const char** text)
{
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
return cache->getUnicharMetrics(SkUTF8_PrevUnichar(text));
}
static const SkGlyph& sk_getMetrics_utf16_next(SkGlyphCache* cache, const char** text)
{
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
return cache->getUnicharMetrics(SkUTF16_NextUnichar((const uint16_t**)text));
}
static const SkGlyph& sk_getMetrics_utf16_prev(SkGlyphCache* cache, const char** text)
{
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
return cache->getUnicharMetrics(SkUTF16_PrevUnichar((const uint16_t**)text));
}
static const SkGlyph& sk_getMetrics_glyph_next(SkGlyphCache* cache, const char** text)
{
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
const uint16_t* ptr = *(const uint16_t**)text;
unsigned glyphID = *ptr;
ptr += 1;
*text = (const char*)ptr;
return cache->getGlyphIDMetrics(glyphID);
}
static const SkGlyph& sk_getMetrics_glyph_prev(SkGlyphCache* cache, const char** text)
{
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
const uint16_t* ptr = *(const uint16_t**)text;
ptr -= 1;
unsigned glyphID = *ptr;
*text = (const char*)ptr;
return cache->getGlyphIDMetrics(glyphID);
}
///
static const SkGlyph& sk_getAdvance_utf8_next(SkGlyphCache* cache, const char** text)
{
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
return cache->getUnicharAdvance(SkUTF8_NextUnichar(text));
}
static const SkGlyph& sk_getAdvance_utf8_prev(SkGlyphCache* cache, const char** text)
{
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
return cache->getUnicharAdvance(SkUTF8_PrevUnichar(text));
}
static const SkGlyph& sk_getAdvance_utf16_next(SkGlyphCache* cache, const char** text)
{
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
return cache->getUnicharAdvance(SkUTF16_NextUnichar((const uint16_t**)text));
}
static const SkGlyph& sk_getAdvance_utf16_prev(SkGlyphCache* cache, const char** text)
{
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
return cache->getUnicharAdvance(SkUTF16_PrevUnichar((const uint16_t**)text));
}
static const SkGlyph& sk_getAdvance_glyph_next(SkGlyphCache* cache, const char** text)
{
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
const uint16_t* ptr = *(const uint16_t**)text;
unsigned glyphID = *ptr;
ptr += 1;
*text = (const char*)ptr;
return cache->getGlyphIDAdvance(glyphID);
}
static const SkGlyph& sk_getAdvance_glyph_prev(SkGlyphCache* cache, const char** text)
{
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
const uint16_t* ptr = *(const uint16_t**)text;
ptr -= 1;
unsigned glyphID = *ptr;
*text = (const char*)ptr;
return cache->getGlyphIDAdvance(glyphID);
}
SkMeasureCacheProc SkPaint::getMeasureCacheProc(TextBufferDirection tbd,
bool needFullMetrics) const
{
static const SkMeasureCacheProc gMeasureCacheProcs[] = {
sk_getMetrics_utf8_next,
sk_getMetrics_utf16_next,
sk_getMetrics_glyph_next,
sk_getMetrics_utf8_prev,
sk_getMetrics_utf16_prev,
sk_getMetrics_glyph_prev,
sk_getAdvance_utf8_next,
sk_getAdvance_utf16_next,
sk_getAdvance_glyph_next,
sk_getAdvance_utf8_prev,
sk_getAdvance_utf16_prev,
sk_getAdvance_glyph_prev
};
unsigned index = this->getTextEncoding();
if (kBackward_TextBufferDirection == tbd)
index += 3;
if (!needFullMetrics && !this->isDevKernText())
index += 6;
SkASSERT(index < SK_ARRAY_COUNT(gMeasureCacheProcs));
return gMeasureCacheProcs[index];
}
///////////////////////////////////////////////////////////////////////////////
static const SkGlyph& sk_getMetrics_utf8_00(SkGlyphCache* cache,
const char** text, SkFixed, SkFixed)
{
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
return cache->getUnicharMetrics(SkUTF8_NextUnichar(text));
}
static const SkGlyph& sk_getMetrics_utf8_xy(SkGlyphCache* cache,
const char** text, SkFixed x, SkFixed y)
{
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
return cache->getUnicharMetrics(SkUTF8_NextUnichar(text), x, y);
}
static const SkGlyph& sk_getMetrics_utf16_00(SkGlyphCache* cache, const char** text,
SkFixed, SkFixed)
{
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
return cache->getUnicharMetrics(SkUTF16_NextUnichar((const uint16_t**)text));
}
static const SkGlyph& sk_getMetrics_utf16_xy(SkGlyphCache* cache,
const char** text, SkFixed x, SkFixed y)
{
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
return cache->getUnicharMetrics(SkUTF16_NextUnichar((const uint16_t**)text),
x, y);
}
static const SkGlyph& sk_getMetrics_glyph_00(SkGlyphCache* cache, const char** text,
SkFixed, SkFixed)
{
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
const uint16_t* ptr = *(const uint16_t**)text;
unsigned glyphID = *ptr;
ptr += 1;
*text = (const char*)ptr;
return cache->getGlyphIDMetrics(glyphID);
}
static const SkGlyph& sk_getMetrics_glyph_xy(SkGlyphCache* cache,
const char** text, SkFixed x, SkFixed y)
{
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
const uint16_t* ptr = *(const uint16_t**)text;
unsigned glyphID = *ptr;
ptr += 1;
*text = (const char*)ptr;
return cache->getGlyphIDMetrics(glyphID, x, y);
}
SkDrawCacheProc SkPaint::getDrawCacheProc() const
{
static const SkDrawCacheProc gDrawCacheProcs[] = {
sk_getMetrics_utf8_00,
sk_getMetrics_utf16_00,
sk_getMetrics_glyph_00,
sk_getMetrics_utf8_xy,
sk_getMetrics_utf16_xy,
sk_getMetrics_glyph_xy
};
unsigned index = this->getTextEncoding();
if (fFlags & kSubpixelText_Flag)
index += 3;
SkASSERT(index < SK_ARRAY_COUNT(gDrawCacheProcs));
return gDrawCacheProcs[index];
}
///////////////////////////////////////////////////////////////////////////////
class SkAutoRestorePaintTextSizeAndFrame {
public:
SkAutoRestorePaintTextSizeAndFrame(const SkPaint* paint) : fPaint((SkPaint*)paint)
{
fTextSize = paint->getTextSize();
fStyle = paint->getStyle();
fPaint->setStyle(SkPaint::kFill_Style);
}
~SkAutoRestorePaintTextSizeAndFrame()
{
fPaint->setStyle(fStyle);
fPaint->setTextSize(fTextSize);
}
private:
SkPaint* fPaint;
SkScalar fTextSize;
SkPaint::Style fStyle;
};
static void set_bounds(const SkGlyph& g, SkRect* bounds)
{
bounds->set(SkIntToScalar(g.fLeft),
SkIntToScalar(g.fTop),
SkIntToScalar(g.fLeft + g.fWidth),
SkIntToScalar(g.fTop + g.fHeight));
}
// 64bits wide, with a 16bit bias. Useful when accumulating lots of 16.16 so
// we don't overflow along the way
typedef int64_t Sk48Dot16;
#ifdef SK_SCALAR_IS_FLOAT
static inline float Sk48Dot16ToScalar(Sk48Dot16 x) {
return x * 1.5258789e-5f; // x * (1 / 65536.0f)
}
#else
static inline SkFixed Sk48Dot16ToScalar(Sk48Dot16 x) {
// just return the low 32bits
return static_cast<SkFixed>(x);
}
#endif
static void join_bounds(const SkGlyph& g, SkRect* bounds, Sk48Dot16 dx)
{
SkScalar sx = Sk48Dot16ToScalar(dx);
bounds->join(SkIntToScalar(g.fLeft) + sx,
SkIntToScalar(g.fTop),
SkIntToScalar(g.fLeft + g.fWidth) + sx,
SkIntToScalar(g.fTop + g.fHeight));
}
SkScalar SkPaint::measure_text(SkGlyphCache* cache,
const char* text, size_t byteLength,
int* count, SkRect* bounds) const
{
SkASSERT(count);
if (byteLength == 0)
{
*count = 0;
if (bounds)
bounds->setEmpty();
return 0;
}
SkMeasureCacheProc glyphCacheProc;
glyphCacheProc = this->getMeasureCacheProc(kForward_TextBufferDirection,
NULL != bounds);
int n = 1;
const char* stop = (const char*)text + byteLength;
const SkGlyph* g = &glyphCacheProc(cache, &text);
// our accumulated fixed-point advances might overflow 16.16, so we use
// a 48.16 (64bit) accumulator, and then convert that to scalar at the
// very end.
Sk48Dot16 x = g->fAdvanceX;
SkAutoKern autokern;
if (NULL == bounds)
{
if (this->isDevKernText())
{
int rsb;
for (; text < stop; n++) {
rsb = g->fRsbDelta;
g = &glyphCacheProc(cache, &text);
x += SkAutoKern_AdjustF(rsb, g->fLsbDelta) + g->fAdvanceX;
}
}
else
{
for (; text < stop; n++) {
x += glyphCacheProc(cache, &text).fAdvanceX;
}
}
}
else
{
set_bounds(*g, bounds);
if (this->isDevKernText())
{
int rsb;
for (; text < stop; n++) {
rsb = g->fRsbDelta;
g = &glyphCacheProc(cache, &text);
x += SkAutoKern_AdjustF(rsb, g->fLsbDelta);
join_bounds(*g, bounds, x);
x += g->fAdvanceX;
}
}
else
{
for (; text < stop; n++) {
g = &glyphCacheProc(cache, &text);
join_bounds(*g, bounds, x);
x += g->fAdvanceX;
}
}
}
SkASSERT(text == stop);
*count = n;
return Sk48Dot16ToScalar(x);
}
SkScalar SkPaint::measureText(const void* textData, size_t length,
SkRect* bounds, SkScalar zoom) const
{
const char* text = (const char*)textData;
SkASSERT(text != NULL || length == 0);
SkScalar scale = 0;
SkAutoRestorePaintTextSizeAndFrame restore(this);
if (this->isLinearText())
{
scale = fTextSize / kCanonicalTextSizeForPaths;
// this gets restored by restore
((SkPaint*)this)->setTextSize(SkIntToScalar(kCanonicalTextSizeForPaths));
}
SkMatrix zoomMatrix, *zoomPtr = NULL;
if (zoom)
{
zoomMatrix.setScale(zoom, zoom);
zoomPtr = &zoomMatrix;
}
SkAutoGlyphCache autoCache(*this, zoomPtr);
SkGlyphCache* cache = autoCache.getCache();
SkScalar width = 0;
if (length > 0)
{
int tempCount;
width = this->measure_text(cache, text, length, &tempCount, bounds);
if (scale)
{
width = SkScalarMul(width, scale);
if (bounds)
{
bounds->fLeft = SkScalarMul(bounds->fLeft, scale);
bounds->fTop = SkScalarMul(bounds->fTop, scale);
bounds->fRight = SkScalarMul(bounds->fRight, scale);
bounds->fBottom = SkScalarMul(bounds->fBottom, scale);
}
}
}
return width;
}
typedef bool (*SkTextBufferPred)(const char* text, const char* stop);
static bool forward_textBufferPred(const char* text, const char* stop)
{
return text < stop;
}
static bool backward_textBufferPred(const char* text, const char* stop)
{
return text > stop;
}
static SkTextBufferPred chooseTextBufferPred(SkPaint::TextBufferDirection tbd,
const char** text, size_t length, const char** stop)
{
if (SkPaint::kForward_TextBufferDirection == tbd)
{
*stop = *text + length;
return forward_textBufferPred;
}
else
{
// text should point to the end of the buffer, and stop to the beginning
*stop = *text;
*text += length;
return backward_textBufferPred;
}
}
size_t SkPaint::breakText(const void* textD, size_t length, SkScalar maxWidth,
SkScalar* measuredWidth,
TextBufferDirection tbd) const
{
if (0 == length || 0 >= maxWidth)
{
if (measuredWidth)
*measuredWidth = 0;
return 0;
}
SkASSERT(textD != NULL);
const char* text = (const char*)textD;
SkScalar scale = 0;
SkAutoRestorePaintTextSizeAndFrame restore(this);
if (this->isLinearText())
{
scale = fTextSize / kCanonicalTextSizeForPaths;
maxWidth = SkScalarMulDiv(maxWidth, kCanonicalTextSizeForPaths, fTextSize);
// this gets restored by restore
((SkPaint*)this)->setTextSize(SkIntToScalar(kCanonicalTextSizeForPaths));
}
SkAutoGlyphCache autoCache(*this, NULL);
SkGlyphCache* cache = autoCache.getCache();
SkMeasureCacheProc glyphCacheProc = this->getMeasureCacheProc(tbd, false);
const char* stop;
SkTextBufferPred pred = chooseTextBufferPred(tbd, &text, length, &stop);
// use 64bits for our accumulator, to avoid overflowing 16.16
Sk48Dot16 max = SkScalarToFixed(maxWidth);
Sk48Dot16 width = 0;
SkAutoKern autokern;
if (this->isDevKernText())
{
int rsb = 0;
while (pred(text, stop))
{
const char* curr = text;
const SkGlyph& g = glyphCacheProc(cache, &text);
SkFixed x = SkAutoKern_AdjustF(rsb, g.fLsbDelta) + g.fAdvanceX;
if ((width += x) > max)
{
width -= x;
text = curr;
break;
}
rsb = g.fRsbDelta;
}
}
else
{
while (pred(text, stop))
{
const char* curr = text;
SkFixed x = glyphCacheProc(cache, &text).fAdvanceX;
if ((width += x) > max)
{
width -= x;
text = curr;
break;
}
}
}
if (measuredWidth)
{
SkScalar scalarWidth = Sk48Dot16ToScalar(width);
if (scale)
scalarWidth = SkScalarMul(scalarWidth, scale);
*measuredWidth = scalarWidth;
}
// return the number of bytes measured
return (kForward_TextBufferDirection == tbd) ?
text - stop + length : stop - text + length;
}
///////////////////////////////////////////////////////////////////////////////
static bool FontMetricsCacheProc(const SkGlyphCache* cache, void* context)
{
*(SkPaint::FontMetrics*)context = cache->getFontMetricsY();
return false; // don't detach the cache
}
static void FontMetricsDescProc(const SkDescriptor* desc, void* context)
{
SkGlyphCache::VisitCache(desc, FontMetricsCacheProc, context);
}
SkScalar SkPaint::getFontMetrics(FontMetrics* metrics, SkScalar zoom) const
{
SkScalar scale = 0;
SkAutoRestorePaintTextSizeAndFrame restore(this);
if (this->isLinearText())
{
scale = fTextSize / kCanonicalTextSizeForPaths;
// this gets restored by restore
((SkPaint*)this)->setTextSize(SkIntToScalar(kCanonicalTextSizeForPaths));
}
SkMatrix zoomMatrix, *zoomPtr = NULL;
if (zoom)
{
zoomMatrix.setScale(zoom, zoom);
zoomPtr = &zoomMatrix;
}
#if 0
SkAutoGlyphCache autoCache(*this, zoomPtr);
SkGlyphCache* cache = autoCache.getCache();
const FontMetrics& my = cache->getFontMetricsY();
#endif
FontMetrics storage;
if (NULL == metrics)
metrics = &storage;
this->descriptorProc(zoomPtr, FontMetricsDescProc, metrics);
if (scale)
{
metrics->fTop = SkScalarMul(metrics->fTop, scale);
metrics->fAscent = SkScalarMul(metrics->fAscent, scale);
metrics->fDescent = SkScalarMul(metrics->fDescent, scale);
metrics->fBottom = SkScalarMul(metrics->fBottom, scale);
metrics->fLeading = SkScalarMul(metrics->fLeading, scale);
}
return metrics->fDescent - metrics->fAscent + metrics->fLeading;
}
////////////////////////////////////////////////////////////////////////////////////////////
static void set_bounds(const SkGlyph& g, SkRect* bounds, SkScalar scale)
{
bounds->set(g.fLeft * scale,
g.fTop * scale,
(g.fLeft + g.fWidth) * scale,
(g.fTop + g.fHeight) * scale);
}
int SkPaint::getTextWidths(const void* textData, size_t byteLength, SkScalar widths[],
SkRect bounds[]) const
{
if (0 == byteLength)
return 0;
SkASSERT(NULL != textData);
if (NULL == widths && NULL == bounds)
return this->countText(textData, byteLength);
SkAutoRestorePaintTextSizeAndFrame restore(this);
SkScalar scale = 0;
if (this->isLinearText())
{
scale = fTextSize / kCanonicalTextSizeForPaths;
// this gets restored by restore
((SkPaint*)this)->setTextSize(SkIntToScalar(kCanonicalTextSizeForPaths));
}
SkAutoGlyphCache autoCache(*this, NULL);
SkGlyphCache* cache = autoCache.getCache();
SkMeasureCacheProc glyphCacheProc;
glyphCacheProc = this->getMeasureCacheProc(kForward_TextBufferDirection,
NULL != bounds);
const char* text = (const char*)textData;
const char* stop = text + byteLength;
int count = 0;
if (this->isDevKernText())
{
// we adjust the widths returned here through auto-kerning
SkAutoKern autokern;
SkFixed prevWidth = 0;
if (scale) {
while (text < stop) {
const SkGlyph& g = glyphCacheProc(cache, &text);
if (widths) {
SkFixed adjust = autokern.adjust(g);
if (count > 0) {
SkScalar w = SkFixedToScalar(prevWidth + adjust);
*widths++ = SkScalarMul(w, scale);
}
prevWidth = g.fAdvanceX;
}
if (bounds) {
set_bounds(g, bounds++, scale);
}
++count;
}
if (count > 0 && widths) {
*widths = SkScalarMul(SkFixedToScalar(prevWidth), scale);
}
} else {
while (text < stop) {
const SkGlyph& g = glyphCacheProc(cache, &text);
if (widths) {
SkFixed adjust = autokern.adjust(g);
if (count > 0) {
*widths++ = SkFixedToScalar(prevWidth + adjust);
}
prevWidth = g.fAdvanceX;
}
if (bounds) {
set_bounds(g, bounds++);
}
++count;
}
if (count > 0 && widths) {
*widths = SkFixedToScalar(prevWidth);
}
}
} else { // no devkern
if (scale) {
while (text < stop) {
const SkGlyph& g = glyphCacheProc(cache, &text);
if (widths) {
*widths++ = SkScalarMul(SkFixedToScalar(g.fAdvanceX),
scale);
}
if (bounds) {
set_bounds(g, bounds++, scale);
}
++count;
}
} else {
while (text < stop) {
const SkGlyph& g = glyphCacheProc(cache, &text);
if (widths) {
*widths++ = SkFixedToScalar(g.fAdvanceX);
}
if (bounds) {
set_bounds(g, bounds++);
}
++count;
}
}
}
SkASSERT(text == stop);
return count;
}
////////////////////////////////////////////////////////////////////////////////////////////
#include "SkDraw.h"
void SkPaint::getTextPath(const void* textData, size_t length, SkScalar x, SkScalar y, SkPath* path) const
{
const char* text = (const char*)textData;
SkASSERT(length == 0 || text != NULL);
if (text == NULL || length == 0 || path == NULL)
return;
SkTextToPathIter iter(text, length, *this, false, true);
SkMatrix matrix;
SkScalar prevXPos = 0;
matrix.setScale(iter.getPathScale(), iter.getPathScale());
matrix.postTranslate(x, y);
path->reset();
SkScalar xpos;
const SkPath* iterPath;
while ((iterPath = iter.next(&xpos)) != NULL)
{
matrix.postTranslate(xpos - prevXPos, 0);
path->addPath(*iterPath, matrix);
prevXPos = xpos;
}
}
static void add_flattenable(SkDescriptor* desc, uint32_t tag,
SkFlattenableWriteBuffer* buffer) {
buffer->flatten(desc->addEntry(tag, buffer->size(), NULL));
}
/*
* interpolates to find the right value for key, in the function represented by the 'length' number of pairs: (keys[i], values[i])
inspired by a desire to change the multiplier for thickness in fakebold
therefore, i assumed number of pairs (length) will be small, so a linear search is sufficient
repeated keys are allowed for discontinuous functions (so long as keys is monotonically increasing), and if
key is the value of a repeated scalar in keys, the first one will be used
- this may change if a binary search is used
- also, this ensures that there is no divide by zero (an assert also checks for that)
*/
static SkScalar interpolate(SkScalar key, const SkScalar keys[], const SkScalar values[], int length)
{
SkASSERT(length > 0);
SkASSERT(keys != NULL);
SkASSERT(values != NULL);
#ifdef SK_DEBUG
for (int i = 1; i < length; i++)
SkASSERT(keys[i] >= keys[i-1]);
#endif
int right = 0;
while (right < length && key > keys[right])
right++;
//could use sentinal values to eliminate conditionals
//i assume i am not in control of input values, so i want to make it simple
if (length == right)
return values[length-1];
if (0 == right)
return values[0];
//otherwise, we interpolate between right-1 and right
SkScalar rVal = values[right];
SkScalar lVal = values[right-1];
SkScalar rightKey = keys[right];
SkScalar leftKey = keys[right-1];
SkASSERT(rightKey != leftKey);
//fractional amount which we will multiply by the difference in the left value and right value
SkScalar fract = SkScalarDiv(key-leftKey,rightKey-leftKey);
return lVal + SkScalarMul(fract, rVal-lVal);
}
//used for interpolating in fakeBold
static const SkScalar pointSizes[] = { SkIntToScalar(9), SkIntToScalar(36) };
static const SkScalar multipliers[] = { SK_Scalar1/24, SK_Scalar1/32 };
static SkMask::Format computeMaskFormat(const SkPaint& paint)
{
uint32_t flags = paint.getFlags();
// Antialiasing being disabled trumps all other settings.
if (!(flags & SkPaint::kAntiAlias_Flag))
return SkMask::kBW_Format;
#if defined(SK_SUPPORT_LCDTEXT)
if (flags & SkPaint::kLCDRenderText_Flag)
return SkFontHost::GetSubpixelOrientation() == SkFontHost::kHorizontal_LCDOrientation ?
SkMask::kHorizontalLCD_Format : SkMask::kVerticalLCD_Format;
#endif
return SkMask::kA8_Format;
}
// if linear-text is on, then we force hinting to be off (since that's sort of
// the point of linear-text.
static SkPaint::Hinting computeHinting(const SkPaint& paint) {
SkPaint::Hinting h = paint.getHinting();
if (paint.isLinearText()) {
h = SkPaint::kNo_Hinting;
}
return h;
}
void SkScalerContext::MakeRec(const SkPaint& paint,
const SkMatrix* deviceMatrix, Rec* rec)
{
SkASSERT(deviceMatrix == NULL ||
(deviceMatrix->getType() & SkMatrix::kPerspective_Mask) == 0);
rec->fFontID = SkTypeface::UniqueID(paint.getTypeface());
rec->fTextSize = paint.getTextSize();
rec->fPreScaleX = paint.getTextScaleX();
rec->fPreSkewX = paint.getTextSkewX();
if (deviceMatrix)
{
rec->fPost2x2[0][0] = deviceMatrix->getScaleX();
rec->fPost2x2[0][1] = deviceMatrix->getSkewX();
rec->fPost2x2[1][0] = deviceMatrix->getSkewY();
rec->fPost2x2[1][1] = deviceMatrix->getScaleY();
}
else
{
rec->fPost2x2[0][0] = rec->fPost2x2[1][1] = SK_Scalar1;
rec->fPost2x2[0][1] = rec->fPost2x2[1][0] = 0;
}
SkPaint::Style style = paint.getStyle();
SkScalar strokeWidth = paint.getStrokeWidth();
unsigned flags = SkFontHost::ComputeGammaFlag(paint);
if (paint.isFakeBoldText())
{
#ifdef SK_USE_FREETYPE_EMBOLDEN
flags |= SkScalerContext::kEmbolden_Flag;
#else
SkScalar fakeBoldScale = interpolate(paint.getTextSize(), pointSizes, multipliers, 2);
SkScalar extra = SkScalarMul(paint.getTextSize(), fakeBoldScale);
if (style == SkPaint::kFill_Style)
{
style = SkPaint::kStrokeAndFill_Style;
strokeWidth = extra; // ignore paint's strokeWidth if it was "fill"
}
else
strokeWidth += extra;
#endif
}
if (paint.isDevKernText())
flags |= SkScalerContext::kDevKernText_Flag;
if (style != SkPaint::kFill_Style && strokeWidth > 0)
{
rec->fFrameWidth = strokeWidth;
rec->fMiterLimit = paint.getStrokeMiter();
rec->fStrokeJoin = SkToU8(paint.getStrokeJoin());
if (style == SkPaint::kStrokeAndFill_Style)
flags |= SkScalerContext::kFrameAndFill_Flag;
}
else
{
rec->fFrameWidth = 0;
rec->fMiterLimit = 0;
rec->fStrokeJoin = 0;
}
rec->fSubpixelPositioning = paint.isSubpixelText();
rec->fMaskFormat = SkToU8(computeMaskFormat(paint));
rec->fFlags = SkToU8(flags);
rec->setHinting(computeHinting(paint));
if (paint.isEmbeddedBitmapText())
rec->fFlags |= SkScalerContext::kEmbeddedBitmapText_Flag;
/* Allow the fonthost to modify our rec before we use it as a key into the
cache. This way if we're asking for something that they will ignore,
they can modify our rec up front, so we don't create duplicate cache
entries.
*/
SkFontHost::FilterRec(rec);
}
#define MIN_SIZE_FOR_EFFECT_BUFFER 1024
void SkPaint::descriptorProc(const SkMatrix* deviceMatrix,
void (*proc)(const SkDescriptor*, void*),
void* context) const
{
SkScalerContext::Rec rec;
SkScalerContext::MakeRec(*this, deviceMatrix, &rec);
size_t descSize = sizeof(rec);
int entryCount = 1;
SkPathEffect* pe = this->getPathEffect();
SkMaskFilter* mf = this->getMaskFilter();
SkRasterizer* ra = this->getRasterizer();
SkFlattenableWriteBuffer peBuffer(MIN_SIZE_FOR_EFFECT_BUFFER);
SkFlattenableWriteBuffer mfBuffer(MIN_SIZE_FOR_EFFECT_BUFFER);
SkFlattenableWriteBuffer raBuffer(MIN_SIZE_FOR_EFFECT_BUFFER);
if (pe) {
peBuffer.writeFlattenable(pe);
descSize += peBuffer.size();
entryCount += 1;
rec.fMaskFormat = SkMask::kA8_Format; // force antialiasing when we do the scan conversion
// seems like we could support kLCD as well at this point...
}
if (mf) {
mfBuffer.writeFlattenable(mf);
descSize += mfBuffer.size();
entryCount += 1;
rec.fMaskFormat = SkMask::kA8_Format; // force antialiasing with maskfilters
}
if (ra) {
raBuffer.writeFlattenable(ra);
descSize += raBuffer.size();
entryCount += 1;
rec.fMaskFormat = SkMask::kA8_Format; // force antialiasing when we do the scan conversion
}
descSize += SkDescriptor::ComputeOverhead(entryCount);
SkAutoDescriptor ad(descSize);
SkDescriptor* desc = ad.getDesc();
desc->init();
desc->addEntry(kRec_SkDescriptorTag, sizeof(rec), &rec);
if (pe) {
add_flattenable(desc, kPathEffect_SkDescriptorTag, &peBuffer);
}
if (mf) {
add_flattenable(desc, kMaskFilter_SkDescriptorTag, &mfBuffer);
}
if (ra) {
add_flattenable(desc, kRasterizer_SkDescriptorTag, &raBuffer);
}
SkASSERT(descSize == desc->getLength());
desc->computeChecksum();
proc(desc, context);
}
static void DetachDescProc(const SkDescriptor* desc, void* context)
{
*((SkGlyphCache**)context) = SkGlyphCache::DetachCache(desc);
}
SkGlyphCache* SkPaint::detachCache(const SkMatrix* deviceMatrix) const
{
SkGlyphCache* cache;
this->descriptorProc(deviceMatrix, DetachDescProc, &cache);
return cache;
}
///////////////////////////////////////////////////////////////////////////////
#include "SkStream.h"
static uintptr_t asint(const void* p) {
return reinterpret_cast<uintptr_t>(p);
}
union Scalar32 {
SkScalar fScalar;
uint32_t f32;
};
static uint32_t* write_scalar(uint32_t* ptr, SkScalar value) {
SkASSERT(sizeof(SkScalar) == sizeof(uint32_t));
Scalar32 tmp;
tmp.fScalar = value;
*ptr = tmp.f32;
return ptr + 1;
}
static SkScalar read_scalar(const uint32_t*& ptr) {
SkASSERT(sizeof(SkScalar) == sizeof(uint32_t));
Scalar32 tmp;
tmp.f32 = *ptr++;
return tmp.fScalar;
}
static uint32_t pack_4(unsigned a, unsigned b, unsigned c, unsigned d) {
SkASSERT(a == (uint8_t)a);
SkASSERT(b == (uint8_t)b);
SkASSERT(c == (uint8_t)c);
SkASSERT(d == (uint8_t)d);
return (a << 24) | (b << 16) | (c << 8) | d;
}
enum FlatFlags {
kHasTypeface_FlatFlag = 0x01,
kHasEffects_FlatFlag = 0x02
};
// The size of a flat paint's POD fields
static const uint32_t kPODPaintSize = 5 * sizeof(SkScalar) +
1 * sizeof(SkColor) +
1 * sizeof(uint16_t) +
6 * sizeof(uint8_t);
/* To save space/time, we analyze the paint, and write a truncated version of
it if there are not tricky elements like shaders, etc.
*/
void SkPaint::flatten(SkFlattenableWriteBuffer& buffer) const {
uint8_t flatFlags = 0;
if (this->getTypeface()) {
flatFlags |= kHasTypeface_FlatFlag;
}
if (asint(this->getPathEffect()) |
asint(this->getShader()) |
asint(this->getXfermode()) |
asint(this->getMaskFilter()) |
asint(this->getColorFilter()) |
asint(this->getRasterizer()) |
asint(this->getLooper())) {
flatFlags |= kHasEffects_FlatFlag;
}
SkASSERT(SkAlign4(kPODPaintSize) == kPODPaintSize);
uint32_t* ptr = buffer.reserve(kPODPaintSize);
ptr = write_scalar(ptr, this->getTextSize());
ptr = write_scalar(ptr, this->getTextScaleX());
ptr = write_scalar(ptr, this->getTextSkewX());
ptr = write_scalar(ptr, this->getStrokeWidth());
ptr = write_scalar(ptr, this->getStrokeMiter());
*ptr++ = this->getColor();
*ptr++ = (this->getFlags() << 16) | (this->getTextAlign() << 8) | flatFlags;
*ptr++ = pack_4(this->getStrokeCap(), this->getStrokeJoin(),
this->getStyle(), this->getTextEncoding());
// now we're done with ptr and the (pre)reserved space. If we need to write
// additional fields, use the buffer directly
if (flatFlags & kHasTypeface_FlatFlag) {
buffer.writeTypeface(this->getTypeface());
}
if (flatFlags & kHasEffects_FlatFlag) {
buffer.writeFlattenable(this->getPathEffect());
buffer.writeFlattenable(this->getShader());
buffer.writeFlattenable(this->getXfermode());
buffer.writeFlattenable(this->getMaskFilter());
buffer.writeFlattenable(this->getColorFilter());
buffer.writeFlattenable(this->getRasterizer());
buffer.writeFlattenable(this->getLooper());
}
}
void SkPaint::unflatten(SkFlattenableReadBuffer& buffer) {
SkASSERT(SkAlign4(kPODPaintSize) == kPODPaintSize);
const void* podData = buffer.skip(kPODPaintSize);
const uint32_t* pod = reinterpret_cast<const uint32_t*>(podData);
// the order we read must match the order we wrote in flatten()
this->setTextSize(read_scalar(pod));
this->setTextScaleX(read_scalar(pod));
this->setTextSkewX(read_scalar(pod));
this->setStrokeWidth(read_scalar(pod));
this->setStrokeMiter(read_scalar(pod));
this->setColor(*pod++);
uint32_t tmp = *pod++;
this->setFlags(tmp >> 16);
this->setTextAlign(static_cast<Align>((tmp >> 8) & 0xFF));
uint8_t flatFlags = tmp & 0xFF;
tmp = *pod++;
this->setStrokeCap(static_cast<Cap>((tmp >> 24) & 0xFF));
this->setStrokeJoin(static_cast<Join>((tmp >> 16) & 0xFF));
this->setStyle(static_cast<Style>((tmp >> 8) & 0xFF));
this->setTextEncoding(static_cast<TextEncoding>((tmp >> 0) & 0xFF));
if (flatFlags & kHasTypeface_FlatFlag) {
this->setTypeface(buffer.readTypeface());
} else {
this->setTypeface(NULL);
}
if (flatFlags & kHasEffects_FlatFlag) {
this->setPathEffect((SkPathEffect*) buffer.readFlattenable())->safeUnref();
this->setShader((SkShader*) buffer.readFlattenable())->safeUnref();
this->setXfermode((SkXfermode*) buffer.readFlattenable())->safeUnref();
this->setMaskFilter((SkMaskFilter*) buffer.readFlattenable())->safeUnref();
this->setColorFilter((SkColorFilter*) buffer.readFlattenable())->safeUnref();
this->setRasterizer((SkRasterizer*) buffer.readFlattenable())->safeUnref();
this->setLooper((SkDrawLooper*) buffer.readFlattenable())->safeUnref();
} else {
this->setPathEffect(NULL);
this->setShader(NULL);
this->setXfermode(NULL);
this->setMaskFilter(NULL);
this->setColorFilter(NULL);
this->setRasterizer(NULL);
this->setLooper(NULL);
}
}
///////////////////////////////////////////////////////////////////////////////
SkShader* SkPaint::setShader(SkShader* shader)
{
SkRefCnt_SafeAssign(fShader, shader);
return shader;
}
SkColorFilter* SkPaint::setColorFilter(SkColorFilter* filter)
{
SkRefCnt_SafeAssign(fColorFilter, filter);
return filter;
}
SkXfermode* SkPaint::setXfermode(SkXfermode* mode)
{
SkRefCnt_SafeAssign(fXfermode, mode);
return mode;
}
SkXfermode* SkPaint::setXfermodeMode(SkXfermode::Mode mode) {
SkSafeUnref(fXfermode);
fXfermode = SkXfermode::Create(mode);
return fXfermode;
}
SkPathEffect* SkPaint::setPathEffect(SkPathEffect* effect)
{
SkRefCnt_SafeAssign(fPathEffect, effect);
return effect;
}
SkMaskFilter* SkPaint::setMaskFilter(SkMaskFilter* filter)
{
SkRefCnt_SafeAssign(fMaskFilter, filter);
return filter;
}
////////////////////////////////////////////////////////////////////////////////////////
bool SkPaint::getFillPath(const SkPath& src, SkPath* dst) const
{
SkPath effectPath, strokePath;
const SkPath* path = &src;
SkScalar width = this->getStrokeWidth();
switch (this->getStyle()) {
case SkPaint::kFill_Style:
width = -1; // mark it as no-stroke
break;
case SkPaint::kStrokeAndFill_Style:
if (width == 0)
width = -1; // mark it as no-stroke
break;
case SkPaint::kStroke_Style:
break;
default:
SkASSERT(!"unknown paint style");
}
if (this->getPathEffect())
{
// lie to the pathEffect if our style is strokeandfill, so that it treats us as just fill
if (this->getStyle() == SkPaint::kStrokeAndFill_Style)
width = -1; // mark it as no-stroke
if (this->getPathEffect()->filterPath(&effectPath, src, &width))
path = &effectPath;
// restore the width if we earlier had to lie, and if we're still set to no-stroke
// note: if we're now stroke (width >= 0), then the pathEffect asked for that change
// and we want to respect that (i.e. don't overwrite their setting for width)
if (this->getStyle() == SkPaint::kStrokeAndFill_Style && width < 0)
{
width = this->getStrokeWidth();
if (width == 0)
width = -1;
}
}
if (width > 0 && !path->isEmpty())
{
SkStroke stroker(*this, width);
stroker.strokePath(*path, &strokePath);
path = &strokePath;
}
if (path == &src)
*dst = src;
else
{
SkASSERT(path == &effectPath || path == &strokePath);
dst->swap(*(SkPath*)path);
}
return width != 0; // return true if we're filled, or false if we're hairline (width == 0)
}
const SkRect& SkPaint::computeStrokeFastBounds(const SkRect& src,
SkRect* storage) const {
SkASSERT(storage);
SkASSERT(this->getStyle() != SkPaint::kFill_Style);
// since we're stroked, outset the rect by the radius (and join type)
SkScalar radius = SkScalarHalf(this->getStrokeWidth());
if (0 == radius) { // hairline
radius = SK_Scalar1;
} else if (this->getStrokeJoin() == SkPaint::kMiter_Join) {
SkScalar scale = this->getStrokeMiter();
if (scale > SK_Scalar1) {
radius = SkScalarMul(radius, scale);
}
}
storage->set(src.fLeft - radius, src.fTop - radius,
src.fRight + radius, src.fBottom + radius);
return *storage;
}
////////////////////////////////////////////////////////////////////////////////////////
static bool has_thick_frame(const SkPaint& paint)
{
return paint.getStrokeWidth() > 0 && paint.getStyle() != SkPaint::kFill_Style;
}
SkTextToPathIter::SkTextToPathIter( const char text[], size_t length,
const SkPaint& paint,
bool applyStrokeAndPathEffects,
bool forceLinearTextOn)
: fPaint(paint) /* make a copy of the paint */
{
fGlyphCacheProc = paint.getMeasureCacheProc(SkPaint::kForward_TextBufferDirection,
true);
if (forceLinearTextOn)
fPaint.setLinearText(true);
fPaint.setMaskFilter(NULL); // don't want this affecting our path-cache lookup
if (fPaint.getPathEffect() == NULL && !has_thick_frame(fPaint))
applyStrokeAndPathEffects = false;
// can't use our canonical size if we need to apply patheffects/strokes
if (fPaint.isLinearText() && !applyStrokeAndPathEffects)
{
fPaint.setTextSize(SkIntToScalar(SkPaint::kCanonicalTextSizeForPaths));
fScale = paint.getTextSize() / SkPaint::kCanonicalTextSizeForPaths;
}
else
fScale = SK_Scalar1;
if (!applyStrokeAndPathEffects)
{
fPaint.setStyle(SkPaint::kFill_Style);
fPaint.setPathEffect(NULL);
}
fCache = fPaint.detachCache(NULL);
SkPaint::Style style = SkPaint::kFill_Style;
SkPathEffect* pe = NULL;
if (!applyStrokeAndPathEffects)
{
style = paint.getStyle(); // restore
pe = paint.getPathEffect(); // restore
}
fPaint.setStyle(style);
fPaint.setPathEffect(pe);
fPaint.setMaskFilter(paint.getMaskFilter()); // restore
// now compute fXOffset if needed
SkScalar xOffset = 0;
if (paint.getTextAlign() != SkPaint::kLeft_Align) // need to measure first
{
int count;
SkScalar width = SkScalarMul(fPaint.measure_text(fCache, text, length, &count, NULL), fScale);
if (paint.getTextAlign() == SkPaint::kCenter_Align)
width = SkScalarHalf(width);
xOffset = -width;
}
fXPos = xOffset;
fPrevAdvance = 0;
fText = text;
fStop = text + length;
}
SkTextToPathIter::~SkTextToPathIter()
{
SkGlyphCache::AttachCache(fCache);
}
const SkPath* SkTextToPathIter::next(SkScalar* xpos)
{
while (fText < fStop)
{
const SkGlyph& glyph = fGlyphCacheProc(fCache, &fText);
fXPos += SkScalarMul(SkFixedToScalar(fPrevAdvance + fAutoKern.adjust(glyph)), fScale);
fPrevAdvance = glyph.fAdvanceX; // + fPaint.getTextTracking();
if (glyph.fWidth)
{
if (xpos)
*xpos = fXPos;
return fCache->findPath(glyph);
}
}
return NULL;
}