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split SkPaint into separate impl files

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Bug: skia:
Change-Id: If82d39be1f85f9c9487e232b56c72dde175243ab
Reviewed-on: https://skia-review.googlesource.com/c/160022
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Mike Reed <reed@google.com>
This commit is contained in:
Mike Reed 2018-10-05 11:48:01 -04:00 committed by Skia Commit-Bot
parent 434377abfb
commit dee25ccb67
3 changed files with 887 additions and 864 deletions
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1
gn/core.gni
View File

@ -206,6 +206,7 @@ skia_core_sources = [
"$_src/core/SkOSFile.h",
"$_src/core/SkOverdrawCanvas.cpp",
"$_src/core/SkPaint.cpp",
"$_src/core/SkPaint_text.cpp",
"$_src/core/SkPaintDefaults.h",
"$_src/core/SkPaintPriv.cpp",
"$_src/core/SkPaintPriv.h",

864
src/core/SkPaint.cpp
View File

@ -12,8 +12,6 @@
#include "SkColorSpaceXformSteps.h"
#include "SkData.h"
#include "SkDraw.h"
#include "SkFontDescriptor.h"
#include "SkGlyphCache.h"
#include "SkGraphics.h"
#include "SkImageFilter.h"
#include "SkMaskFilter.h"
@ -26,7 +24,6 @@
#include "SkReadBuffer.h"
#include "SkSafeRange.h"
#include "SkScalar.h"
#include "SkScalerContext.h"
#include "SkShader.h"
#include "SkShaderBase.h"
#include "SkStringUtils.h"
@ -34,10 +31,6 @@
#include "SkStrokeRec.h"
#include "SkSurfacePriv.h"
#include "SkTLazy.h"
#include "SkTextBlob.h"
#include "SkTextBlobPriv.h"
#include "SkTextFormatParams.h"
#include "SkTextToPathIter.h"
#include "SkTo.h"
#include "SkTypeface.h"
#include "SkWriteBuffer.h"
@ -373,752 +366,6 @@ void SkPaint::setLooper(sk_sp<SkDrawLooper> looper) { fDrawLooper = std::move(lo
///////////////////////////////////////////////////////////////////////////////
static SkScalar mag2(SkScalar x, SkScalar y) {
return x * x + y * y;
}
static bool tooBig(const SkMatrix& m, SkScalar ma2max) {
return mag2(m[SkMatrix::kMScaleX], m[SkMatrix::kMSkewY]) > ma2max
||
mag2(m[SkMatrix::kMSkewX], m[SkMatrix::kMScaleY]) > ma2max;
}
bool SkPaint::TooBigToUseCache(const SkMatrix& ctm, const SkMatrix& textM, SkScalar maxLimit) {
SkASSERT(!ctm.hasPerspective());
SkASSERT(!textM.hasPerspective());
SkMatrix matrix;
matrix.setConcat(ctm, textM);
return tooBig(matrix, MaxCacheSize2(maxLimit));
}
SkScalar SkPaint::MaxCacheSize2(SkScalar maxLimit) {
// we have a self-imposed maximum, just for memory-usage sanity
const int limit = SkMin32(SkGraphics::GetFontCachePointSizeLimit(), maxLimit);
const SkScalar maxSize = SkIntToScalar(limit);
return maxSize * maxSize;
}
///////////////////////////////////////////////////////////////////////////////
#include "SkGlyphCache.h"
#include "SkUtils.h"
int SkPaint::countText(const void* text, size_t byteLength) const {
SkASSERT(text != nullptr);
switch (this->getTextEncoding()) {
case kUTF8_TextEncoding:
return SkUTF::CountUTF8((const char*)text, byteLength);
case kUTF16_TextEncoding:
return SkUTF::CountUTF16((const uint16_t*)text, byteLength);
case kUTF32_TextEncoding:
return SkToInt(byteLength >> 2);
case kGlyphID_TextEncoding:
return SkToInt(byteLength >> 1);
default:
SkDEBUGFAIL("unknown text encoding");
}
return 0;
}
static SkTypeface::Encoding to_encoding(SkPaint::TextEncoding e) {
static_assert((int)SkTypeface::kUTF8_Encoding == (int)SkPaint::kUTF8_TextEncoding, "");
static_assert((int)SkTypeface::kUTF16_Encoding == (int)SkPaint::kUTF16_TextEncoding, "");
static_assert((int)SkTypeface::kUTF32_Encoding == (int)SkPaint::kUTF32_TextEncoding, "");
return (SkTypeface::Encoding)e;
}
int SkPaint::textToGlyphs(const void* textData, size_t byteLength, uint16_t glyphs[]) const {
SkASSERT(textData != nullptr);
if (nullptr == glyphs) {
return this->countText(textData, byteLength);
}
// 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 SkToInt(byteLength >> 1);
}
auto cache = SkStrikeCache::FindOrCreateStrikeExclusive(*this);
const void* stop = (const char*)textData + byteLength;
uint16_t* gptr = glyphs;
const SkTypeface::Encoding encoding = to_encoding(this->getTextEncoding());
while (textData < stop) {
SkUnichar unichar = SkUTFN_Next(encoding, &textData, stop);
if (unichar < 0) {
return 0; // bad UTF-N sequence
}
*gptr++ = cache->unicharToGlyph(unichar);
}
return SkToInt(gptr - glyphs);
}
bool SkPaint::containsText(const void* textData, size_t byteLength) const {
if (0 == byteLength) {
return true;
}
SkASSERT(textData != nullptr);
// 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;
}
auto cache = SkStrikeCache::FindOrCreateStrikeExclusive(*this);
const void* stop = (const char*)textData + byteLength;
const SkTypeface::Encoding encoding = to_encoding(this->getTextEncoding());
while (textData < stop) {
if (0 == cache->unicharToGlyph(SkUTFN_Next(encoding, &textData, stop))) {
return false;
}
}
return true;
}
void SkPaint::glyphsToUnichars(const uint16_t glyphs[], int count, SkUnichar textData[]) const {
if (count <= 0) {
return;
}
SkASSERT(glyphs != nullptr);
SkASSERT(textData != nullptr);
SkSurfaceProps props(0, kUnknown_SkPixelGeometry);
auto cache = SkStrikeCache::FindOrCreateStrikeExclusive(
*this, &props, SkScalerContextFlags::kFakeGammaAndBoostContrast, nullptr);
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,
const char* stop) {
SkASSERT(cache != nullptr);
SkASSERT(text != nullptr);
return cache->getUnicharMetrics(SkUTF::NextUTF8(text, stop));
}
static const SkGlyph& sk_getMetrics_utf16_next(SkGlyphCache* cache,
const char** text,
const char* stop) {
SkASSERT(cache != nullptr);
SkASSERT(text != nullptr);
return cache->getUnicharMetrics(
SkUTF::NextUTF16((const uint16_t**)text, (const uint16_t*)stop));
}
static const SkGlyph& sk_getMetrics_utf32_next(SkGlyphCache* cache,
const char** text,
const char* stop) {
SkASSERT(cache != nullptr);
SkASSERT(text != nullptr);
return cache->getUnicharMetrics(SkUTF::NextUTF32((const int32_t**)text, (const int32_t*)stop));
}
static const SkGlyph& sk_getMetrics_glyph_next(SkGlyphCache* cache,
const char** text,
const char* stop) {
SkASSERT(cache != nullptr);
SkASSERT(text != nullptr);
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_getAdvance_utf8_next(SkGlyphCache* cache,
const char** text,
const char* stop) {
SkASSERT(cache != nullptr);
SkASSERT(text != nullptr);
return cache->getUnicharAdvance(SkUTF::NextUTF8(text, stop));
}
static const SkGlyph& sk_getAdvance_utf16_next(SkGlyphCache* cache,
const char** text,
const char* stop) {
SkASSERT(cache != nullptr);
SkASSERT(text != nullptr);
return cache->getUnicharAdvance(
SkUTF::NextUTF16((const uint16_t**)text, (const uint16_t*)stop));
}
static const SkGlyph& sk_getAdvance_utf32_next(SkGlyphCache* cache,
const char** text,
const char* stop) {
SkASSERT(cache != nullptr);
SkASSERT(text != nullptr);
return cache->getUnicharAdvance(SkUTF::NextUTF32((const int32_t**)text, (const int32_t*)stop));
}
static const SkGlyph& sk_getAdvance_glyph_next(SkGlyphCache* cache,
const char** text,
const char* stop) {
SkASSERT(cache != nullptr);
SkASSERT(text != nullptr);
const uint16_t* ptr = *(const uint16_t**)text;
unsigned glyphID = *ptr;
ptr += 1;
*text = (const char*)ptr;
return cache->getGlyphIDAdvance(glyphID);
}
SkPaint::GlyphCacheProc SkPaint::GetGlyphCacheProc(TextEncoding encoding,
bool needFullMetrics) {
static const GlyphCacheProc gGlyphCacheProcs[] = {
sk_getMetrics_utf8_next,
sk_getMetrics_utf16_next,
sk_getMetrics_utf32_next,
sk_getMetrics_glyph_next,
sk_getAdvance_utf8_next,
sk_getAdvance_utf16_next,
sk_getAdvance_utf32_next,
sk_getAdvance_glyph_next,
};
unsigned index = encoding;
if (!needFullMetrics) {
index += 4;
}
SkASSERT(index < SK_ARRAY_COUNT(gGlyphCacheProcs));
return gGlyphCacheProcs[index];
}
///////////////////////////////////////////////////////////////////////////////
SkScalar SkPaint::setupForAsPaths() {
constexpr uint32_t flagsToIgnore = SkPaint::kLinearText_Flag |
SkPaint::kLCDRenderText_Flag |
SkPaint::kEmbeddedBitmapText_Flag |
SkPaint::kAutoHinting_Flag;
uint32_t flags = this->getFlags();
// clear the flags we don't care about
flags &= ~flagsToIgnore;
// set the flags we do care about
flags |= SkPaint::kSubpixelText_Flag;
this->setFlags(flags);
this->setHinting(SkPaint::kNo_Hinting);
this->setStyle(SkPaint::kFill_Style);
this->setPathEffect(nullptr);
SkScalar textSize = fTextSize;
this->setTextSize(kCanonicalTextSizeForPaths);
return textSize / kCanonicalTextSizeForPaths;
}
class SkCanonicalizePaint {
public:
SkCanonicalizePaint(const SkPaint& paint) : fPaint(&paint), fScale(0) {
if (paint.isLinearText() || SkDraw::ShouldDrawTextAsPaths(paint, SkMatrix::I())) {
SkPaint* p = fLazy.set(paint);
fScale = p->setupForAsPaths();
fPaint = p;
}
}
const SkPaint& getPaint() const { return *fPaint; }
/**
* Returns 0 if the paint was unmodified, or the scale factor need to
* the original textSize
*/
SkScalar getScale() const { return fScale; }
private:
const SkPaint* fPaint;
SkScalar fScale;
SkTLazy<SkPaint> fLazy;
};
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));
}
static void join_bounds_x(const SkGlyph& g, SkRect* bounds, SkScalar dx) {
bounds->join(SkIntToScalar(g.fLeft) + dx,
SkIntToScalar(g.fTop),
SkIntToScalar(g.fLeft + g.fWidth) + dx,
SkIntToScalar(g.fTop + g.fHeight));
}
static void join_bounds_y(const SkGlyph& g, SkRect* bounds, SkScalar dy) {
bounds->join(SkIntToScalar(g.fLeft),
SkIntToScalar(g.fTop) + dy,
SkIntToScalar(g.fLeft + g.fWidth),
SkIntToScalar(g.fTop + g.fHeight) + dy);
}
typedef void (*JoinBoundsProc)(const SkGlyph&, SkRect*, SkScalar);
// xyIndex is 0 for fAdvanceX or 1 for fAdvanceY
static SkScalar advance(const SkGlyph& glyph, int xyIndex) {
SkASSERT(0 == xyIndex || 1 == xyIndex);
return SkFloatToScalar((&glyph.fAdvanceX)[xyIndex]);
}
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;
}
GlyphCacheProc glyphCacheProc = SkPaint::GetGlyphCacheProc(this->getTextEncoding(),
nullptr != bounds);
int xyIndex;
JoinBoundsProc joinBoundsProc;
if (this->isVerticalText()) {
xyIndex = 1;
joinBoundsProc = join_bounds_y;
} else {
xyIndex = 0;
joinBoundsProc = join_bounds_x;
}
int n = 1;
const char* stop = (const char*)text + byteLength;
const SkGlyph* g = &glyphCacheProc(cache, &text, stop);
SkScalar x = advance(*g, xyIndex);
if (nullptr == bounds) {
for (; text < stop; n++) {
x += advance(glyphCacheProc(cache, &text, stop), xyIndex);
}
} else {
set_bounds(*g, bounds);
for (; text < stop; n++) {
g = &glyphCacheProc(cache, &text, stop);
joinBoundsProc(*g, bounds, x);
x += advance(*g, xyIndex);
}
}
SkASSERT(text == stop);
*count = n;
return x;
}
SkScalar SkPaint::measureText(const void* textData, size_t length, SkRect* bounds) const {
const char* text = (const char*)textData;
SkASSERT(text != nullptr || length == 0);
SkCanonicalizePaint canon(*this);
const SkPaint& paint = canon.getPaint();
SkScalar scale = canon.getScale();
auto cache = SkStrikeCache::FindOrCreateStrikeExclusive(paint);
SkScalar width = 0;
if (length > 0) {
int tempCount;
width = paint.measure_text(cache.get(), text, length, &tempCount, bounds);
if (scale) {
width *= scale;
if (bounds) {
bounds->fLeft *= scale;
bounds->fTop *= scale;
bounds->fRight *= scale;
bounds->fBottom *= scale;
}
}
} else if (bounds) {
// ensure that even if we don't measure_text we still update the bounds
bounds->setEmpty();
}
return width;
}
size_t SkPaint::breakText(const void* textD, size_t length, SkScalar maxWidth,
SkScalar* measuredWidth) const {
if (0 == length || 0 >= maxWidth) {
if (measuredWidth) {
*measuredWidth = 0;
}
return 0;
}
if (0 == fTextSize) {
if (measuredWidth) {
*measuredWidth = 0;
}
return length;
}
SkASSERT(textD != nullptr);
const char* text = (const char*)textD;
const char* stop = text + length;
SkCanonicalizePaint canon(*this);
const SkPaint& paint = canon.getPaint();
SkScalar scale = canon.getScale();
// adjust max in case we changed the textSize in paint
if (scale) {
maxWidth /= scale;
}
auto cache = SkStrikeCache::FindOrCreateStrikeExclusive(paint);
GlyphCacheProc glyphCacheProc = SkPaint::GetGlyphCacheProc(paint.getTextEncoding(),
false);
const int xyIndex = paint.isVerticalText() ? 1 : 0;
SkScalar width = 0;
while (text < stop) {
const char* curr = text;
SkScalar x = advance(glyphCacheProc(cache.get(), &text, stop), xyIndex);
if ((width += x) > maxWidth) {
width -= x;
text = curr;
break;
}
}
if (measuredWidth) {
if (scale) {
width *= scale;
}
*measuredWidth = width;
}
// return the number of bytes measured
return text - stop + length;
}
///////////////////////////////////////////////////////////////////////////////
SkScalar SkPaint::getFontMetrics(FontMetrics* metrics, SkScalar zoom) const {
SkCanonicalizePaint canon(*this);
const SkPaint& paint = canon.getPaint();
SkScalar scale = canon.getScale();
SkMatrix zoomMatrix, *zoomPtr = nullptr;
if (zoom) {
zoomMatrix.setScale(zoom, zoom);
zoomPtr = &zoomMatrix;
}
FontMetrics storage;
if (nullptr == metrics) {
metrics = &storage;
}
SkAutoDescriptor ad;
SkScalerContextEffects effects;
auto desc = SkScalerContext::CreateDescriptorAndEffectsUsingPaint(
paint, nullptr, SkScalerContextFlags::kNone, zoomPtr, &ad, &effects);
{
auto typeface = SkPaintPriv::GetTypefaceOrDefault(paint);
auto cache = SkStrikeCache::FindOrCreateStrikeExclusive(*desc, effects, *typeface);
*metrics = cache->getFontMetrics();
}
if (scale) {
SkPaintPriv::ScaleFontMetrics(metrics, 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(textData);
if (nullptr == widths && nullptr == bounds) {
return this->countText(textData, byteLength);
}
SkCanonicalizePaint canon(*this);
const SkPaint& paint = canon.getPaint();
SkScalar scale = canon.getScale();
auto cache = SkStrikeCache::FindOrCreateStrikeExclusive(paint);
GlyphCacheProc glyphCacheProc = SkPaint::GetGlyphCacheProc(paint.getTextEncoding(),
nullptr != bounds);
const char* text = (const char*)textData;
const char* stop = text + byteLength;
int count = 0;
const int xyIndex = paint.isVerticalText() ? 1 : 0;
if (scale) {
while (text < stop) {
const SkGlyph& g = glyphCacheProc(cache.get(), &text, stop);
if (widths) {
*widths++ = advance(g, xyIndex) * scale;
}
if (bounds) {
set_bounds(g, bounds++, scale);
}
++count;
}
} else {
while (text < stop) {
const SkGlyph& g = glyphCacheProc(cache.get(), &text, stop);
if (widths) {
*widths++ = advance(g, xyIndex);
}
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 {
SkASSERT(length == 0 || textData != nullptr);
const char* text = (const char*)textData;
if (text == nullptr || length == 0 || path == nullptr) {
return;
}
SkTextToPathIter iter(text, length, *this, false);
SkMatrix matrix;
SkScalar prevXPos = 0;
matrix.setScale(iter.getPathScale(), iter.getPathScale());
matrix.postTranslate(x, y);
path->reset();
SkScalar xpos;
const SkPath* iterPath;
while (iter.next(&iterPath, &xpos)) {
matrix.postTranslate(xpos - prevXPos, 0);
if (iterPath) {
path->addPath(*iterPath, matrix);
}
prevXPos = xpos;
}
}
void SkPaint::getPosTextPath(const void* textData, size_t length,
const SkPoint pos[], SkPath* path) const {
SkASSERT(length == 0 || textData != nullptr);
const char* text = (const char*)textData;
if (text == nullptr || length == 0 || path == nullptr) {
return;
}
SkTextToPathIter iter(text, length, *this, false);
SkMatrix matrix;
SkPoint prevPos;
prevPos.set(0, 0);
matrix.setScale(iter.getPathScale(), iter.getPathScale());
path->reset();
unsigned int i = 0;
const SkPath* iterPath;
while (iter.next(&iterPath, nullptr)) {
matrix.postTranslate(pos[i].fX - prevPos.fX, pos[i].fY - prevPos.fY);
if (iterPath) {
path->addPath(*iterPath, matrix);
}
prevPos = pos[i];
i++;
}
}
template <SkTextInterceptsIter::TextType TextType, typename Func>
int GetTextIntercepts(const SkPaint& paint, const void* text, size_t length,
const SkScalar bounds[2], SkScalar* array, Func posMaker) {
SkASSERT(length == 0 || text != nullptr);
if (!length) {
return 0;
}
const SkPoint pos0 = posMaker(0);
SkTextInterceptsIter iter(static_cast<const char*>(text), length, paint, bounds,
pos0.x(), pos0.y(), TextType);
int i = 0;
int count = 0;
while (iter.next(array, &count)) {
if (TextType == SkTextInterceptsIter::TextType::kPosText) {
const SkPoint pos = posMaker(++i);
iter.setPosition(pos.x(), pos.y());
}
}
return count;
}
int SkPaint::getTextIntercepts(const void* textData, size_t length,
SkScalar x, SkScalar y, const SkScalar bounds[2],
SkScalar* array) const {
return GetTextIntercepts<SkTextInterceptsIter::TextType::kText>(
*this, textData, length, bounds, array, [&x, &y] (int) -> SkPoint {
return SkPoint::Make(x, y);
});
}
int SkPaint::getPosTextIntercepts(const void* textData, size_t length, const SkPoint pos[],
const SkScalar bounds[2], SkScalar* array) const {
return GetTextIntercepts<SkTextInterceptsIter::TextType::kPosText>(
*this, textData, length, bounds, array, [&pos] (int i) -> SkPoint {
return pos[i];
});
}
int SkPaint::getPosTextHIntercepts(const void* textData, size_t length, const SkScalar xpos[],
SkScalar constY, const SkScalar bounds[2],
SkScalar* array) const {
return GetTextIntercepts<SkTextInterceptsIter::TextType::kPosText>(
*this, textData, length, bounds, array, [&xpos, &constY] (int i) -> SkPoint {
return SkPoint::Make(xpos[i], constY);
});
}
int SkPaint::getTextBlobIntercepts(const SkTextBlob* blob, const SkScalar bounds[2],
SkScalar* intervals) const {
int count = 0;
SkPaint runPaint(*this);
SkTextBlobRunIterator it(blob);
while (!it.done()) {
it.applyFontToPaint(&runPaint);
const size_t runByteCount = it.glyphCount() * sizeof(SkGlyphID);
SkScalar* runIntervals = intervals ? intervals + count : nullptr;
switch (it.positioning()) {
case SkTextBlobRunIterator::kDefault_Positioning:
count += runPaint.getTextIntercepts(it.glyphs(), runByteCount, it.offset().x(),
it.offset().y(), bounds, runIntervals);
break;
case SkTextBlobRunIterator::kHorizontal_Positioning:
count += runPaint.getPosTextHIntercepts(it.glyphs(), runByteCount, it.pos(),
it.offset().y(), bounds, runIntervals);
break;
case SkTextBlobRunIterator::kFull_Positioning:
count += runPaint.getPosTextIntercepts(it.glyphs(), runByteCount,
reinterpret_cast<const SkPoint*>(it.pos()),
bounds, runIntervals);
break;
}
it.next();
}
return count;
}
SkRect SkPaint::getFontBounds() const {
SkMatrix m;
m.setScale(fTextSize * fTextScaleX, fTextSize);
m.postSkew(fTextSkewX, 0);
SkTypeface* typeface = SkPaintPriv::GetTypefaceOrDefault(*this);
SkRect bounds;
m.mapRect(&bounds, typeface->getBounds());
return bounds;
}
// return true if the paint is just a single color (i.e. not a shader). If its
// a shader, then we can't compute a const luminance for it :(
static bool just_a_color(const SkPaint& paint, SkColor* color) {
SkColor c = paint.getColor();
const auto* shader = as_SB(paint.getShader());
if (shader && !shader->asLuminanceColor(&c)) {
return false;
}
if (paint.getColorFilter()) {
c = paint.getColorFilter()->filterColor(c);
}
if (color) {
*color = c;
}
return true;
}
SkColor SkPaint::computeLuminanceColor() const {
SkColor c;
if (!just_a_color(*this, &c)) {
c = SkColorSetRGB(0x7F, 0x80, 0x7F);
}
return c;
}
///////////////////////////////////////////////////////////////////////////////
#include "SkStream.h"
static uintptr_t asint(const void* p) {
@ -1367,117 +614,6 @@ const SkRect& SkPaint::doComputeFastBounds(const SkRect& origSrc,
///////////////////////////////////////////////////////////////////////////////
static bool has_thick_frame(const SkPaint& paint) {
return paint.getStrokeWidth() > 0 &&
paint.getStyle() != SkPaint::kFill_Style;
}
SkTextBaseIter::SkTextBaseIter(const char text[], size_t length,
const SkPaint& paint,
bool applyStrokeAndPathEffects)
: fPaint(paint) {
fGlyphCacheProc = SkPaint::GetGlyphCacheProc(paint.getTextEncoding(), true);
fPaint.setLinearText(true);
fPaint.setMaskFilter(nullptr); // don't want this affecting our path-cache lookup
if (fPaint.getPathEffect() == nullptr && !has_thick_frame(fPaint)) {
applyStrokeAndPathEffects = false;
}
// can't use our canonical size if we need to apply patheffects
if (fPaint.getPathEffect() == nullptr) {
fPaint.setTextSize(SkIntToScalar(SkPaint::kCanonicalTextSizeForPaths));
fScale = paint.getTextSize() / SkPaint::kCanonicalTextSizeForPaths;
// Note: fScale can be zero here (even if it wasn't before the divide). It can also
// be very very small. We call sk_ieee_float_divide below to ensure IEEE divide behavior,
// since downstream we will check for the resulting coordinates being non-finite anyway.
// Thus we don't need to check for zero here.
if (has_thick_frame(fPaint)) {
fPaint.setStrokeWidth(sk_ieee_float_divide(fPaint.getStrokeWidth(), fScale));
}
} else {
fScale = SK_Scalar1;
}
if (!applyStrokeAndPathEffects) {
fPaint.setStyle(SkPaint::kFill_Style);
fPaint.setPathEffect(nullptr);
}
// SRGBTODO: Is this correct?
fCache = SkStrikeCache::FindOrCreateStrikeExclusive(
fPaint, nullptr,
SkScalerContextFlags::kFakeGammaAndBoostContrast, nullptr);
SkPaint::Style style = SkPaint::kFill_Style;
sk_sp<SkPathEffect> pe;
if (!applyStrokeAndPathEffects) {
style = paint.getStyle(); // restore
pe = paint.refPathEffect(); // restore
}
fPaint.setStyle(style);
fPaint.setPathEffect(pe);
fPaint.setMaskFilter(paint.refMaskFilter()); // restore
// now compute fXOffset if needed
SkScalar xOffset = 0;
if (paint.getTextAlign() != SkPaint::kLeft_Align) { // need to measure first
int count;
SkScalar width = fPaint.measure_text(fCache.get(), text, length, &count, nullptr) * fScale;
if (paint.getTextAlign() == SkPaint::kCenter_Align) {
width = SkScalarHalf(width);
}
xOffset = -width;
}
fXPos = xOffset;
fPrevAdvance = 0;
fText = text;
fStop = text + length;
fXYIndex = paint.isVerticalText() ? 1 : 0;
}
bool SkTextToPathIter::next(const SkPath** path, SkScalar* xpos) {
if (fText < fStop) {
const SkGlyph& glyph = fGlyphCacheProc(fCache.get(), &fText, fStop);
fXPos += fPrevAdvance * fScale;
fPrevAdvance = advance(glyph, fXYIndex); // + fPaint.getTextTracking();
if (glyph.fWidth) {
if (path) {
*path = fCache->findPath(glyph);
}
} else {
if (path) {
*path = nullptr;
}
}
if (xpos) {
*xpos = fXPos;
}
return true;
}
return false;
}
bool SkTextInterceptsIter::next(SkScalar* array, int* count) {
const SkGlyph& glyph = fGlyphCacheProc(fCache.get(), &fText, fStop);
fXPos += fPrevAdvance * fScale;
fPrevAdvance = advance(glyph, fXYIndex); // + fPaint.getTextTracking();
if (fCache->findPath(glyph)) {
fCache->findIntercepts(fBounds, fScale, fXPos, SkToBool(fXYIndex),
const_cast<SkGlyph*>(&glyph), array, count);
}
return fText < fStop;
}
///////////////////////////////////////////////////////////////////////////////
// return true if the filter exists, and may affect alpha
static bool affects_alpha(const SkColorFilter* cf) {
return cf && !(cf->getFlags() & SkColorFilter::kAlphaUnchanged_Flag);

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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkPaint.h"
#include "SkColorFilter.h"
#include "SkDraw.h"
#include "SkFontDescriptor.h"
#include "SkGlyphCache.h"
#include "SkGraphics.h"
#include "SkPaintDefaults.h"
#include "SkPaintPriv.h"
#include "SkPathEffect.h"
#include "SkSafeRange.h"
#include "SkScalar.h"
#include "SkScalerContext.h"
#include "SkShader.h"
#include "SkShaderBase.h"
#include "SkStringUtils.h"
#include "SkTLazy.h"
#include "SkTextBlob.h"
#include "SkTextBlobPriv.h"
#include "SkTextFormatParams.h"
#include "SkTextToPathIter.h"
#include "SkTo.h"
#include "SkTypeface.h"
///////////////////////////////////////////////////////////////////////////////
static SkScalar mag2(SkScalar x, SkScalar y) {
return x * x + y * y;
}
static bool tooBig(const SkMatrix& m, SkScalar ma2max) {
return mag2(m[SkMatrix::kMScaleX], m[SkMatrix::kMSkewY]) > ma2max
||
mag2(m[SkMatrix::kMSkewX], m[SkMatrix::kMScaleY]) > ma2max;
}
bool SkPaint::TooBigToUseCache(const SkMatrix& ctm, const SkMatrix& textM, SkScalar maxLimit) {
SkASSERT(!ctm.hasPerspective());
SkASSERT(!textM.hasPerspective());
SkMatrix matrix;
matrix.setConcat(ctm, textM);
return tooBig(matrix, MaxCacheSize2(maxLimit));
}
SkScalar SkPaint::MaxCacheSize2(SkScalar maxLimit) {
// we have a self-imposed maximum, just for memory-usage sanity
const int limit = SkMin32(SkGraphics::GetFontCachePointSizeLimit(), maxLimit);
const SkScalar maxSize = SkIntToScalar(limit);
return maxSize * maxSize;
}
///////////////////////////////////////////////////////////////////////////////
#include "SkGlyphCache.h"
#include "SkUtils.h"
int SkPaint::countText(const void* text, size_t byteLength) const {
SkASSERT(text != nullptr);
switch (this->getTextEncoding()) {
case kUTF8_TextEncoding:
return SkUTF::CountUTF8((const char*)text, byteLength);
case kUTF16_TextEncoding:
return SkUTF::CountUTF16((const uint16_t*)text, byteLength);
case kUTF32_TextEncoding:
return SkToInt(byteLength >> 2);
case kGlyphID_TextEncoding:
return SkToInt(byteLength >> 1);
default:
SkDEBUGFAIL("unknown text encoding");
}
return 0;
}
static SkTypeface::Encoding to_encoding(SkPaint::TextEncoding e) {
static_assert((int)SkTypeface::kUTF8_Encoding == (int)SkPaint::kUTF8_TextEncoding, "");
static_assert((int)SkTypeface::kUTF16_Encoding == (int)SkPaint::kUTF16_TextEncoding, "");
static_assert((int)SkTypeface::kUTF32_Encoding == (int)SkPaint::kUTF32_TextEncoding, "");
return (SkTypeface::Encoding)e;
}
int SkPaint::textToGlyphs(const void* textData, size_t byteLength, uint16_t glyphs[]) const {
SkASSERT(textData != nullptr);
if (nullptr == glyphs) {
return this->countText(textData, byteLength);
}
// 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 SkToInt(byteLength >> 1);
}
auto cache = SkStrikeCache::FindOrCreateStrikeExclusive(*this);
const void* stop = (const char*)textData + byteLength;
uint16_t* gptr = glyphs;
const SkTypeface::Encoding encoding = to_encoding(this->getTextEncoding());
while (textData < stop) {
SkUnichar unichar = SkUTFN_Next(encoding, &textData, stop);
if (unichar < 0) {
return 0; // bad UTF-N sequence
}
*gptr++ = cache->unicharToGlyph(unichar);
}
return SkToInt(gptr - glyphs);
}
bool SkPaint::containsText(const void* textData, size_t byteLength) const {
if (0 == byteLength) {
return true;
}
SkASSERT(textData != nullptr);
// 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;
}
auto cache = SkStrikeCache::FindOrCreateStrikeExclusive(*this);
const void* stop = (const char*)textData + byteLength;
const SkTypeface::Encoding encoding = to_encoding(this->getTextEncoding());
while (textData < stop) {
if (0 == cache->unicharToGlyph(SkUTFN_Next(encoding, &textData, stop))) {
return false;
}
}
return true;
}
void SkPaint::glyphsToUnichars(const uint16_t glyphs[], int count, SkUnichar textData[]) const {
if (count <= 0) {
return;
}
SkASSERT(glyphs != nullptr);
SkASSERT(textData != nullptr);
SkSurfaceProps props(0, kUnknown_SkPixelGeometry);
auto cache = SkStrikeCache::FindOrCreateStrikeExclusive(
*this, &props, SkScalerContextFlags::kFakeGammaAndBoostContrast, nullptr);
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,
const char* stop) {
SkASSERT(cache != nullptr);
SkASSERT(text != nullptr);
return cache->getUnicharMetrics(SkUTF::NextUTF8(text, stop));
}
static const SkGlyph& sk_getMetrics_utf16_next(SkGlyphCache* cache,
const char** text,
const char* stop) {
SkASSERT(cache != nullptr);
SkASSERT(text != nullptr);
return cache->getUnicharMetrics(
SkUTF::NextUTF16((const uint16_t**)text, (const uint16_t*)stop));
}
static const SkGlyph& sk_getMetrics_utf32_next(SkGlyphCache* cache,
const char** text,
const char* stop) {
SkASSERT(cache != nullptr);
SkASSERT(text != nullptr);
return cache->getUnicharMetrics(SkUTF::NextUTF32((const int32_t**)text, (const int32_t*)stop));
}
static const SkGlyph& sk_getMetrics_glyph_next(SkGlyphCache* cache,
const char** text,
const char* stop) {
SkASSERT(cache != nullptr);
SkASSERT(text != nullptr);
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_getAdvance_utf8_next(SkGlyphCache* cache,
const char** text,
const char* stop) {
SkASSERT(cache != nullptr);
SkASSERT(text != nullptr);
return cache->getUnicharAdvance(SkUTF::NextUTF8(text, stop));
}
static const SkGlyph& sk_getAdvance_utf16_next(SkGlyphCache* cache,
const char** text,
const char* stop) {
SkASSERT(cache != nullptr);
SkASSERT(text != nullptr);
return cache->getUnicharAdvance(
SkUTF::NextUTF16((const uint16_t**)text, (const uint16_t*)stop));
}
static const SkGlyph& sk_getAdvance_utf32_next(SkGlyphCache* cache,
const char** text,
const char* stop) {
SkASSERT(cache != nullptr);
SkASSERT(text != nullptr);
return cache->getUnicharAdvance(SkUTF::NextUTF32((const int32_t**)text, (const int32_t*)stop));
}
static const SkGlyph& sk_getAdvance_glyph_next(SkGlyphCache* cache,
const char** text,
const char* stop) {
SkASSERT(cache != nullptr);
SkASSERT(text != nullptr);
const uint16_t* ptr = *(const uint16_t**)text;
unsigned glyphID = *ptr;
ptr += 1;
*text = (const char*)ptr;
return cache->getGlyphIDAdvance(glyphID);
}
SkPaint::GlyphCacheProc SkPaint::GetGlyphCacheProc(TextEncoding encoding,
bool needFullMetrics) {
static const GlyphCacheProc gGlyphCacheProcs[] = {
sk_getMetrics_utf8_next,
sk_getMetrics_utf16_next,
sk_getMetrics_utf32_next,
sk_getMetrics_glyph_next,
sk_getAdvance_utf8_next,
sk_getAdvance_utf16_next,
sk_getAdvance_utf32_next,
sk_getAdvance_glyph_next,
};
unsigned index = encoding;
if (!needFullMetrics) {
index += 4;
}
SkASSERT(index < SK_ARRAY_COUNT(gGlyphCacheProcs));
return gGlyphCacheProcs[index];
}
///////////////////////////////////////////////////////////////////////////////
SkScalar SkPaint::setupForAsPaths() {
constexpr uint32_t flagsToIgnore = SkPaint::kLinearText_Flag |
SkPaint::kLCDRenderText_Flag |
SkPaint::kEmbeddedBitmapText_Flag |
SkPaint::kAutoHinting_Flag;
uint32_t flags = this->getFlags();
// clear the flags we don't care about
flags &= ~flagsToIgnore;
// set the flags we do care about
flags |= SkPaint::kSubpixelText_Flag;
this->setFlags(flags);
this->setHinting(SkPaint::kNo_Hinting);
this->setStyle(SkPaint::kFill_Style);
this->setPathEffect(nullptr);
SkScalar textSize = fTextSize;
this->setTextSize(kCanonicalTextSizeForPaths);
return textSize / kCanonicalTextSizeForPaths;
}
class SkCanonicalizePaint {
public:
SkCanonicalizePaint(const SkPaint& paint) : fPaint(&paint), fScale(0) {
if (paint.isLinearText() || SkDraw::ShouldDrawTextAsPaths(paint, SkMatrix::I())) {
SkPaint* p = fLazy.set(paint);
fScale = p->setupForAsPaths();
fPaint = p;
}
}
const SkPaint& getPaint() const { return *fPaint; }
/**
* Returns 0 if the paint was unmodified, or the scale factor need to
* the original textSize
*/
SkScalar getScale() const { return fScale; }
private:
const SkPaint* fPaint;
SkScalar fScale;
SkTLazy<SkPaint> fLazy;
};
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));
}
static void join_bounds_x(const SkGlyph& g, SkRect* bounds, SkScalar dx) {
bounds->join(SkIntToScalar(g.fLeft) + dx,
SkIntToScalar(g.fTop),
SkIntToScalar(g.fLeft + g.fWidth) + dx,
SkIntToScalar(g.fTop + g.fHeight));
}
static void join_bounds_y(const SkGlyph& g, SkRect* bounds, SkScalar dy) {
bounds->join(SkIntToScalar(g.fLeft),
SkIntToScalar(g.fTop) + dy,
SkIntToScalar(g.fLeft + g.fWidth),
SkIntToScalar(g.fTop + g.fHeight) + dy);
}
typedef void (*JoinBoundsProc)(const SkGlyph&, SkRect*, SkScalar);
// xyIndex is 0 for fAdvanceX or 1 for fAdvanceY
static SkScalar advance(const SkGlyph& glyph, int xyIndex) {
SkASSERT(0 == xyIndex || 1 == xyIndex);
return SkFloatToScalar((&glyph.fAdvanceX)[xyIndex]);
}
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;
}
GlyphCacheProc glyphCacheProc = SkPaint::GetGlyphCacheProc(this->getTextEncoding(),
nullptr != bounds);
int xyIndex;
JoinBoundsProc joinBoundsProc;
if (this->isVerticalText()) {
xyIndex = 1;
joinBoundsProc = join_bounds_y;
} else {
xyIndex = 0;
joinBoundsProc = join_bounds_x;
}
int n = 1;
const char* stop = (const char*)text + byteLength;
const SkGlyph* g = &glyphCacheProc(cache, &text, stop);
SkScalar x = advance(*g, xyIndex);
if (nullptr == bounds) {
for (; text < stop; n++) {
x += advance(glyphCacheProc(cache, &text, stop), xyIndex);
}
} else {
set_bounds(*g, bounds);
for (; text < stop; n++) {
g = &glyphCacheProc(cache, &text, stop);
joinBoundsProc(*g, bounds, x);
x += advance(*g, xyIndex);
}
}
SkASSERT(text == stop);
*count = n;
return x;
}
SkScalar SkPaint::measureText(const void* textData, size_t length, SkRect* bounds) const {
const char* text = (const char*)textData;
SkASSERT(text != nullptr || length == 0);
SkCanonicalizePaint canon(*this);
const SkPaint& paint = canon.getPaint();
SkScalar scale = canon.getScale();
auto cache = SkStrikeCache::FindOrCreateStrikeExclusive(paint);
SkScalar width = 0;
if (length > 0) {
int tempCount;
width = paint.measure_text(cache.get(), text, length, &tempCount, bounds);
if (scale) {
width *= scale;
if (bounds) {
bounds->fLeft *= scale;
bounds->fTop *= scale;
bounds->fRight *= scale;
bounds->fBottom *= scale;
}
}
} else if (bounds) {
// ensure that even if we don't measure_text we still update the bounds
bounds->setEmpty();
}
return width;
}
size_t SkPaint::breakText(const void* textD, size_t length, SkScalar maxWidth,
SkScalar* measuredWidth) const {
if (0 == length || 0 >= maxWidth) {
if (measuredWidth) {
*measuredWidth = 0;
}
return 0;
}
if (0 == fTextSize) {
if (measuredWidth) {
*measuredWidth = 0;
}
return length;
}
SkASSERT(textD != nullptr);
const char* text = (const char*)textD;
const char* stop = text + length;
SkCanonicalizePaint canon(*this);
const SkPaint& paint = canon.getPaint();
SkScalar scale = canon.getScale();
// adjust max in case we changed the textSize in paint
if (scale) {
maxWidth /= scale;
}
auto cache = SkStrikeCache::FindOrCreateStrikeExclusive(paint);
GlyphCacheProc glyphCacheProc = SkPaint::GetGlyphCacheProc(paint.getTextEncoding(),
false);
const int xyIndex = paint.isVerticalText() ? 1 : 0;
SkScalar width = 0;
while (text < stop) {
const char* curr = text;
SkScalar x = advance(glyphCacheProc(cache.get(), &text, stop), xyIndex);
if ((width += x) > maxWidth) {
width -= x;
text = curr;
break;
}
}
if (measuredWidth) {
if (scale) {
width *= scale;
}
*measuredWidth = width;
}
// return the number of bytes measured
return text - stop + length;
}
///////////////////////////////////////////////////////////////////////////////
SkScalar SkPaint::getFontMetrics(FontMetrics* metrics, SkScalar zoom) const {
SkCanonicalizePaint canon(*this);
const SkPaint& paint = canon.getPaint();
SkScalar scale = canon.getScale();
SkMatrix zoomMatrix, *zoomPtr = nullptr;
if (zoom) {
zoomMatrix.setScale(zoom, zoom);
zoomPtr = &zoomMatrix;
}
FontMetrics storage;
if (nullptr == metrics) {
metrics = &storage;
}
SkAutoDescriptor ad;
SkScalerContextEffects effects;
auto desc = SkScalerContext::CreateDescriptorAndEffectsUsingPaint(
paint, nullptr, SkScalerContextFlags::kNone, zoomPtr, &ad, &effects);
{
auto typeface = SkPaintPriv::GetTypefaceOrDefault(paint);
auto cache = SkStrikeCache::FindOrCreateStrikeExclusive(*desc, effects, *typeface);
*metrics = cache->getFontMetrics();
}
if (scale) {
SkPaintPriv::ScaleFontMetrics(metrics, 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(textData);
if (nullptr == widths && nullptr == bounds) {
return this->countText(textData, byteLength);
}
SkCanonicalizePaint canon(*this);
const SkPaint& paint = canon.getPaint();
SkScalar scale = canon.getScale();
auto cache = SkStrikeCache::FindOrCreateStrikeExclusive(paint);
GlyphCacheProc glyphCacheProc = SkPaint::GetGlyphCacheProc(paint.getTextEncoding(),
nullptr != bounds);
const char* text = (const char*)textData;
const char* stop = text + byteLength;
int count = 0;
const int xyIndex = paint.isVerticalText() ? 1 : 0;
if (scale) {
while (text < stop) {
const SkGlyph& g = glyphCacheProc(cache.get(), &text, stop);
if (widths) {
*widths++ = advance(g, xyIndex) * scale;
}
if (bounds) {
set_bounds(g, bounds++, scale);
}
++count;
}
} else {
while (text < stop) {
const SkGlyph& g = glyphCacheProc(cache.get(), &text, stop);
if (widths) {
*widths++ = advance(g, xyIndex);
}
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 {
SkASSERT(length == 0 || textData != nullptr);
const char* text = (const char*)textData;
if (text == nullptr || length == 0 || path == nullptr) {
return;
}
SkTextToPathIter iter(text, length, *this, false);
SkMatrix matrix;
SkScalar prevXPos = 0;
matrix.setScale(iter.getPathScale(), iter.getPathScale());
matrix.postTranslate(x, y);
path->reset();
SkScalar xpos;
const SkPath* iterPath;
while (iter.next(&iterPath, &xpos)) {
matrix.postTranslate(xpos - prevXPos, 0);
if (iterPath) {
path->addPath(*iterPath, matrix);
}
prevXPos = xpos;
}
}
void SkPaint::getPosTextPath(const void* textData, size_t length,
const SkPoint pos[], SkPath* path) const {
SkASSERT(length == 0 || textData != nullptr);
const char* text = (const char*)textData;
if (text == nullptr || length == 0 || path == nullptr) {
return;
}
SkTextToPathIter iter(text, length, *this, false);
SkMatrix matrix;
SkPoint prevPos;
prevPos.set(0, 0);
matrix.setScale(iter.getPathScale(), iter.getPathScale());
path->reset();
unsigned int i = 0;
const SkPath* iterPath;
while (iter.next(&iterPath, nullptr)) {
matrix.postTranslate(pos[i].fX - prevPos.fX, pos[i].fY - prevPos.fY);
if (iterPath) {
path->addPath(*iterPath, matrix);
}
prevPos = pos[i];
i++;
}
}
template <SkTextInterceptsIter::TextType TextType, typename Func>
int GetTextIntercepts(const SkPaint& paint, const void* text, size_t length,
const SkScalar bounds[2], SkScalar* array, Func posMaker) {
SkASSERT(length == 0 || text != nullptr);
if (!length) {
return 0;
}
const SkPoint pos0 = posMaker(0);
SkTextInterceptsIter iter(static_cast<const char*>(text), length, paint, bounds,
pos0.x(), pos0.y(), TextType);
int i = 0;
int count = 0;
while (iter.next(array, &count)) {
if (TextType == SkTextInterceptsIter::TextType::kPosText) {
const SkPoint pos = posMaker(++i);
iter.setPosition(pos.x(), pos.y());
}
}
return count;
}
int SkPaint::getTextIntercepts(const void* textData, size_t length,
SkScalar x, SkScalar y, const SkScalar bounds[2],
SkScalar* array) const {
return GetTextIntercepts<SkTextInterceptsIter::TextType::kText>(
*this, textData, length, bounds, array, [&x, &y] (int) -> SkPoint {
return SkPoint::Make(x, y);
});
}
int SkPaint::getPosTextIntercepts(const void* textData, size_t length, const SkPoint pos[],
const SkScalar bounds[2], SkScalar* array) const {
return GetTextIntercepts<SkTextInterceptsIter::TextType::kPosText>(
*this, textData, length, bounds, array, [&pos] (int i) -> SkPoint {
return pos[i];
});
}
int SkPaint::getPosTextHIntercepts(const void* textData, size_t length, const SkScalar xpos[],
SkScalar constY, const SkScalar bounds[2],
SkScalar* array) const {
return GetTextIntercepts<SkTextInterceptsIter::TextType::kPosText>(
*this, textData, length, bounds, array, [&xpos, &constY] (int i) -> SkPoint {
return SkPoint::Make(xpos[i], constY);
});
}
int SkPaint::getTextBlobIntercepts(const SkTextBlob* blob, const SkScalar bounds[2],
SkScalar* intervals) const {
int count = 0;
SkPaint runPaint(*this);
SkTextBlobRunIterator it(blob);
while (!it.done()) {
it.applyFontToPaint(&runPaint);
const size_t runByteCount = it.glyphCount() * sizeof(SkGlyphID);
SkScalar* runIntervals = intervals ? intervals + count : nullptr;
switch (it.positioning()) {
case SkTextBlobRunIterator::kDefault_Positioning:
count += runPaint.getTextIntercepts(it.glyphs(), runByteCount, it.offset().x(),
it.offset().y(), bounds, runIntervals);
break;
case SkTextBlobRunIterator::kHorizontal_Positioning:
count += runPaint.getPosTextHIntercepts(it.glyphs(), runByteCount, it.pos(),
it.offset().y(), bounds, runIntervals);
break;
case SkTextBlobRunIterator::kFull_Positioning:
count += runPaint.getPosTextIntercepts(it.glyphs(), runByteCount,
reinterpret_cast<const SkPoint*>(it.pos()),
bounds, runIntervals);
break;
}
it.next();
}
return count;
}
SkRect SkPaint::getFontBounds() const {
SkMatrix m;
m.setScale(fTextSize * fTextScaleX, fTextSize);
m.postSkew(fTextSkewX, 0);
SkTypeface* typeface = SkPaintPriv::GetTypefaceOrDefault(*this);
SkRect bounds;
m.mapRect(&bounds, typeface->getBounds());
return bounds;
}
// return true if the paint is just a single color (i.e. not a shader). If its
// a shader, then we can't compute a const luminance for it :(
static bool just_a_color(const SkPaint& paint, SkColor* color) {
SkColor c = paint.getColor();
const auto* shader = as_SB(paint.getShader());
if (shader && !shader->asLuminanceColor(&c)) {
return false;
}
if (paint.getColorFilter()) {
c = paint.getColorFilter()->filterColor(c);
}
if (color) {
*color = c;
}
return true;
}
SkColor SkPaint::computeLuminanceColor() const {
SkColor c;
if (!just_a_color(*this, &c)) {
c = SkColorSetRGB(0x7F, 0x80, 0x7F);
}
return c;
}
///////////////////////////////////////////////////////////////////////////////
static bool has_thick_frame(const SkPaint& paint) {
return paint.getStrokeWidth() > 0 &&
paint.getStyle() != SkPaint::kFill_Style;
}
SkTextBaseIter::SkTextBaseIter(const char text[], size_t length,
const SkPaint& paint,
bool applyStrokeAndPathEffects)
: fPaint(paint) {
fGlyphCacheProc = SkPaint::GetGlyphCacheProc(paint.getTextEncoding(), true);
fPaint.setLinearText(true);
fPaint.setMaskFilter(nullptr); // don't want this affecting our path-cache lookup
if (fPaint.getPathEffect() == nullptr && !has_thick_frame(fPaint)) {
applyStrokeAndPathEffects = false;
}
// can't use our canonical size if we need to apply patheffects
if (fPaint.getPathEffect() == nullptr) {
fPaint.setTextSize(SkIntToScalar(SkPaint::kCanonicalTextSizeForPaths));
fScale = paint.getTextSize() / SkPaint::kCanonicalTextSizeForPaths;
// Note: fScale can be zero here (even if it wasn't before the divide). It can also
// be very very small. We call sk_ieee_float_divide below to ensure IEEE divide behavior,
// since downstream we will check for the resulting coordinates being non-finite anyway.
// Thus we don't need to check for zero here.
if (has_thick_frame(fPaint)) {
fPaint.setStrokeWidth(sk_ieee_float_divide(fPaint.getStrokeWidth(), fScale));
}
} else {
fScale = SK_Scalar1;
}
if (!applyStrokeAndPathEffects) {
fPaint.setStyle(SkPaint::kFill_Style);
fPaint.setPathEffect(nullptr);
}
// SRGBTODO: Is this correct?
fCache = SkStrikeCache::FindOrCreateStrikeExclusive(
fPaint, nullptr,
SkScalerContextFlags::kFakeGammaAndBoostContrast, nullptr);
SkPaint::Style style = SkPaint::kFill_Style;
sk_sp<SkPathEffect> pe;
if (!applyStrokeAndPathEffects) {
style = paint.getStyle(); // restore
pe = paint.refPathEffect(); // restore
}
fPaint.setStyle(style);
fPaint.setPathEffect(pe);
fPaint.setMaskFilter(paint.refMaskFilter()); // restore
// now compute fXOffset if needed
SkScalar xOffset = 0;
if (paint.getTextAlign() != SkPaint::kLeft_Align) { // need to measure first
int count;
SkScalar width = fPaint.measure_text(fCache.get(), text, length, &count, nullptr) * fScale;
if (paint.getTextAlign() == SkPaint::kCenter_Align) {
width = SkScalarHalf(width);
}
xOffset = -width;
}
fXPos = xOffset;
fPrevAdvance = 0;
fText = text;
fStop = text + length;
fXYIndex = paint.isVerticalText() ? 1 : 0;
}
bool SkTextToPathIter::next(const SkPath** path, SkScalar* xpos) {
if (fText < fStop) {
const SkGlyph& glyph = fGlyphCacheProc(fCache.get(), &fText, fStop);
fXPos += fPrevAdvance * fScale;
fPrevAdvance = advance(glyph, fXYIndex); // + fPaint.getTextTracking();
if (glyph.fWidth) {
if (path) {
*path = fCache->findPath(glyph);
}
} else {
if (path) {
*path = nullptr;
}
}
if (xpos) {
*xpos = fXPos;
}
return true;
}
return false;
}
bool SkTextInterceptsIter::next(SkScalar* array, int* count) {
const SkGlyph& glyph = fGlyphCacheProc(fCache.get(), &fText, fStop);
fXPos += fPrevAdvance * fScale;
fPrevAdvance = advance(glyph, fXYIndex); // + fPaint.getTextTracking();
if (fCache->findPath(glyph)) {
fCache->findIntercepts(fBounds, fScale, fXPos, SkToBool(fXYIndex),
const_cast<SkGlyph*>(&glyph), array, count);
}
return fText < fStop;
}