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SkPDF: encode all bitmap images as Type3

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Change-Id: Ic99c536ea7da6b6a55dd92395eee26c969fee966
Reviewed-on: https://skia-review.googlesource.com/158343
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
This commit is contained in:
Hal Canary 2018-10-01 13:38:30 -04:00 committed by Skia Commit-Bot
parent 1d5b598c4e
commit 8ef78eae93
4 changed files with 101 additions and 152 deletions
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19
src/pdf/SkPDFCanon.h
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@ -52,25 +52,6 @@ public:
sk_sp<SkPDFStream> fInvertFunction;
sk_sp<SkPDFDict> fNoSmaskGraphicState;
sk_sp<SkPDFArray> fRangeObject;
SK_BEGIN_REQUIRE_DENSE
struct BitmapGlyphKey {
SkFontID fFontID; // uint32_t
SkScalar fTextSize; // float32
SkScalar fTextScaleX; // float32
SkScalar fTextSkewX; // float32
SkGlyphID fGlyphID; // uint16_t
uint16_t fPadding;
};
SK_END_REQUIRE_DENSE
struct BitmapGlyph {
sk_sp<SkImage> fImage;
SkIPoint fOffset;
};
SkTHashMap<BitmapGlyphKey, BitmapGlyph> fBitmapGlyphImages;
};
inline bool operator==(const SkPDFCanon::BitmapGlyphKey& u, const SkPDFCanon::BitmapGlyphKey& v) {
return memcmp(&u, &v, sizeof(SkPDFCanon::BitmapGlyphKey)) == 0;
}
#endif // SkPDFCanon_DEFINED

136
src/pdf/SkPDFDevice.cpp
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@ -937,12 +937,10 @@ class GlyphPositioner {
public:
GlyphPositioner(SkDynamicMemoryWStream* content,
SkScalar textSkewX,
bool wideChars,
SkPoint origin)
: fContent(content)
, fCurrentMatrixOrigin(origin)
, fTextSkewX(textSkewX)
, fWideChars(wideChars) {
, fTextSkewX(textSkewX) {
}
~GlyphPositioner() { this->flush(); }
void flush() {
@ -951,6 +949,10 @@ public:
fInText = false;
}
}
void setWideChars(bool wide) {
this->flush();
fWideChars = wide;
}
void writeGlyph(SkPoint xy,
SkScalar advanceWidth,
uint16_t glyph) {
@ -995,7 +997,7 @@ private:
SkPoint fCurrentMatrixOrigin;
SkScalar fXAdvance = 0.0f;
SkScalar fTextSkewX;
bool fWideChars;
bool fWideChars = true;
bool fInText = false;
bool fInitialized = false;
};
@ -1012,12 +1014,6 @@ struct PositionedGlyph {
};
}
static bool has_outline_glyph(SkGlyphID gid, SkGlyphCache* cache) {
const SkGlyph& glyph = cache->getGlyphIDMetrics(gid);
const SkPath* path = cache->findPath(glyph);
return (path && !path->isEmpty()) || (glyph.fWidth == 0 && glyph.fHeight == 0);
}
static SkRect get_glyph_bounds_device_space(SkGlyphID gid, SkGlyphCache* cache,
SkScalar xScale, SkScalar yScale,
SkPoint xy, const SkMatrix& ctm) {
@ -1036,88 +1032,6 @@ static bool contains(const SkRect& r, SkPoint p) {
r.top() <= p.y() && p.y() <= r.bottom();
}
static sk_sp<SkImage> image_from_mask(const SkMask& mask) {
if (!mask.fImage) {
return nullptr;
}
SkIRect bounds = mask.fBounds;
SkBitmap bm;
switch (mask.fFormat) {
case SkMask::kBW_Format:
bm.allocPixels(SkImageInfo::MakeA8(bounds.width(), bounds.height()));
for (int y = 0; y < bm.height(); ++y) {
for (int x8 = 0; x8 < bm.width(); x8 += 8) {
uint8_t v = *mask.getAddr1(x8 + bounds.x(), y + bounds.y());
int e = SkTMin(x8 + 8, bm.width());
for (int x = x8; x < e; ++x) {
*bm.getAddr8(x, y) = (v >> (x & 0x7)) & 0x1 ? 0xFF : 0x00;
}
}
}
bm.setImmutable();
return SkImage::MakeFromBitmap(bm);
case SkMask::kA8_Format:
bm.installPixels(SkImageInfo::MakeA8(bounds.width(), bounds.height()),
mask.fImage, mask.fRowBytes);
return SkMakeImageFromRasterBitmap(bm, kAlways_SkCopyPixelsMode);
case SkMask::kARGB32_Format:
bm.installPixels(SkImageInfo::MakeN32Premul(bounds.width(), bounds.height()),
mask.fImage, mask.fRowBytes);
return SkMakeImageFromRasterBitmap(bm, kAlways_SkCopyPixelsMode);
case SkMask::k3D_Format:
SkASSERT(false);
return nullptr;
case SkMask::kLCD16_Format:
SkASSERT(false);
return nullptr;
default:
SkASSERT(false);
return nullptr;
}
}
void draw_missing_glyphs(SkPDFDevice* dev, const SkPaint& paint, SkTypeface* typeface,
const std::vector<PositionedGlyph>& missingGlyphs) {
if (missingGlyphs.size() == 0) {
return;
}
// Fall back on images.
SkPaint scaledGlyphCachePaint;
scaledGlyphCachePaint.setTextSize(paint.getTextSize());
scaledGlyphCachePaint.setTextScaleX(paint.getTextScaleX());
scaledGlyphCachePaint.setTextSkewX(paint.getTextSkewX());
scaledGlyphCachePaint.setTypeface(sk_ref_sp(typeface));
auto scaledGlyphCache = SkStrikeCache::FindOrCreateStrikeExclusive(scaledGlyphCachePaint);
SkTHashMap<SkPDFCanon::BitmapGlyphKey, SkPDFCanon::BitmapGlyph>* map =
&dev->getCanon()->fBitmapGlyphImages;
for (PositionedGlyph positionedGlyph : missingGlyphs) {
SkPDFCanon::BitmapGlyphKey key = {typeface->uniqueID(),
paint.getTextSize(),
paint.getTextScaleX(),
paint.getTextSkewX(),
positionedGlyph.fGlyph,
0};
SkImage* img = nullptr;
SkIPoint imgOffset = {0, 0};
if (SkPDFCanon::BitmapGlyph* ptr = map->find(key)) {
img = ptr->fImage.get();
imgOffset = ptr->fOffset;
} else {
(void)scaledGlyphCache->findImage(
scaledGlyphCache->getGlyphIDMetrics(positionedGlyph.fGlyph));
SkMask mask;
scaledGlyphCache->getGlyphIDMetrics(positionedGlyph.fGlyph).toMask(&mask);
imgOffset = {mask.fBounds.x(), mask.fBounds.y()};
img = map->set(key, {image_from_mask(mask), imgOffset})->fImage.get();
}
if (img) {
SkPoint pt = positionedGlyph.fPos +
SkPoint{(SkScalar)imgOffset.x(), (SkScalar)imgOffset.y()};
dev->drawImage(img, pt.x(), pt.y(), paint);
}
}
}
void SkPDFDevice::drawGlyphRunAsPath(const SkGlyphRun& glyphRun, SkPoint offset) {
const SkPaint& paint = glyphRun.paint();
SkPath path;
@ -1150,21 +1064,6 @@ void SkPDFDevice::drawGlyphRunAsPath(const SkGlyphRun& glyphRun, SkPoint offset)
} else {
this->internalDrawGlyphRun(tmp, offset);
}
if (!tmp.paint().getTypeface()) {
return;
}
std::vector<PositionedGlyph> missingGlyphs;
int emSize;
auto glyphCache = SkPDFFont::MakeVectorCache(tmp.paint().getTypeface(), &emSize);
for (size_t i = 0; i < glyphRun.shuntGlyphsIDs().size(); ++i) {
SkGlyphID gid = glyphRun.shuntGlyphsIDs()[i];
if (!has_outline_glyph(gid, glyphCache.get())) {
SkPoint xy = glyphRun.positions()[i];
missingGlyphs.push_back({xy + offset, gid});
}
}
draw_missing_glyphs(this, paint, tmp.paint().getTypeface(), missingGlyphs);
}
void SkPDFDevice::internalDrawGlyphRun(const SkGlyphRun& glyphRun, SkPoint offset) {
@ -1217,7 +1116,6 @@ void SkPDFDevice::internalDrawGlyphRun(const SkGlyphRun& glyphRun, SkPoint offse
SkASSERT(paint.getTextAlign() == SkPaint::kLeft_Align);
SkRect clipStackBounds = this->cs().bounds(this->bounds());
std::vector<PositionedGlyph> missingGlyphs;
{
ScopedContentEntry content(this, paint, true);
if (!content.entry()) {
@ -1243,15 +1141,11 @@ void SkPDFDevice::internalDrawGlyphRun(const SkGlyphRun& glyphRun, SkPoint offse
const SkGlyphID maxGlyphID = SkToU16(typeface->countGlyphs() - 1);
bool multiByteGlyphs = SkPDFFont::IsMultiByte(SkPDFFont::FontType(*metrics));
if (clusterator.reversedChars()) {
out->writeText("/ReversedChars BMC\n");
}
SK_AT_SCOPE_EXIT(if (clusterator.reversedChars()) { out->writeText("EMC\n"); } );
GlyphPositioner glyphPositioner(out,
paint.getTextSkewX(),
multiByteGlyphs,
offset);
GlyphPositioner glyphPositioner(out, paint.getTextSkewX(), offset);
SkPDFFont* font = nullptr;
while (SkClusterator::Cluster c = clusterator.next()) {
@ -1300,7 +1194,8 @@ void SkPDFDevice::internalDrawGlyphRun(const SkGlyphRun& glyphRun, SkPoint offse
if (!font || !font->hasGlyph(gid)) {
// Not yet specified font or need to switch font.
sk_sp<SkPDFFont> newFont =
SkPDFFont::GetFontResource(fDocument->canon(), typeface, gid);
SkPDFFont::GetFontResource(
fDocument->canon(), glyphCache.get(), typeface, gid);
SkASSERT(newFont); // All preconditions for SkPDFFont::GetFontResource are met.
if (!newFont) {
return;
@ -1310,13 +1205,12 @@ void SkPDFDevice::internalDrawGlyphRun(const SkGlyphRun& glyphRun, SkPoint offse
int fontIndex = find_or_add(&fFontResources, std::move(newFont));
glyphPositioner.flush();
glyphPositioner.setWideChars(font->multiByteGlyphs());
SkPDFWriteResourceName(out, SkPDFResourceType::kFont, fontIndex);
out->writeText(" ");
SkPDFUtils::AppendScalar(textSize, out);
out->writeText(" Tf\n");
SkASSERT(font->multiByteGlyphs() == multiByteGlyphs);
}
SkPoint xy = glyphRun.positions()[index];
// Do a glyph-by-glyph bounds-reject if positions are absolute.
@ -1332,21 +1226,15 @@ void SkPDFDevice::internalDrawGlyphRun(const SkGlyphRun& glyphRun, SkPoint offse
continue; // reject glyphs as out of bounds
}
}
if (!has_outline_glyph(gid, glyphCache.get())) {
missingGlyphs.push_back({xy + offset, gid});
}
font->noteGlyphUsage(gid);
SkGlyphID encodedGlyph = multiByteGlyphs ? gid : font->glyphToPDFFontEncoding(gid);
SkGlyphID encodedGlyph = font->multiByteGlyphs()
? gid : font->glyphToPDFFontEncoding(gid);
SkScalar advance = advanceScale * glyphCache->getGlyphIDAdvance(gid).fAdvanceX;
glyphPositioner.writeGlyph(xy, advance, encodedGlyph);
}
}
}
if (paint.getColor() != SK_ColorTRANSPARENT) {
draw_missing_glyphs(this, srcPaint, typeface, missingGlyphs);
}
}
void SkPDFDevice::drawGlyphRunList(const SkGlyphRunList& glyphRunList) {

81
src/pdf/SkPDFFont.cpp
View File

@ -9,13 +9,16 @@
#include "SkData.h"
#include "SkGlyphCache.h"
#include "SkImagePriv.h"
#include "SkMacros.h"
#include "SkMakeUnique.h"
#include "SkPDFBitmap.h"
#include "SkPDFCanon.h"
#include "SkPDFConvertType1FontStream.h"
#include "SkPDFDevice.h"
#include "SkPDFMakeCIDGlyphWidthsArray.h"
#include "SkPDFMakeToUnicodeCmap.h"
#include "SkPDFResourceDict.h"
#include "SkPDFUtils.h"
#include "SkPaint.h"
#include "SkRefCnt.h"
@ -205,7 +208,14 @@ static SkGlyphID first_nonzero_glyph_for_single_byte_encoding(SkGlyphID gid) {
return gid != 0 ? gid - (gid - 1) % 255 : 1;
}
static bool has_outline_glyph(SkGlyphID gid, SkGlyphCache* cache) {
const SkGlyph& glyph = cache->getGlyphIDMetrics(gid);
const SkPath* path = cache->findPath(glyph);
return (path && !path->isEmpty()) || (glyph.fWidth == 0 && glyph.fHeight == 0);
}
sk_sp<SkPDFFont> SkPDFFont::GetFontResource(SkPDFCanon* canon,
SkGlyphCache* cache,
SkTypeface* face,
SkGlyphID glyphID) {
SkASSERT(canon);
@ -215,6 +225,9 @@ sk_sp<SkPDFFont> SkPDFFont::GetFontResource(SkPDFCanon* canon,
// GetMetrics only returns null to signify a bad typeface.
const SkAdvancedTypefaceMetrics& metrics = *fontMetrics;
SkAdvancedTypefaceMetrics::FontType type = SkPDFFont::FontType(metrics);
if (!has_outline_glyph(glyphID, cache)) {
type = SkAdvancedTypefaceMetrics::kOther_Font;
}
bool multibyte = SkPDFFont::IsMultiByte(type);
SkGlyphID subsetCode = multibyte ? 0 : first_nonzero_glyph_for_single_byte_encoding(glyphID);
uint64_t fontID = (static_cast<uint64_t>(SkTypeface::UniqueID(face)) << 16) | subsetCode;
@ -636,6 +649,51 @@ private:
};
}
struct ImageAndOffset {
sk_sp<SkImage> fImage;
SkIPoint fOffset;
};
static ImageAndOffset to_image(SkGlyphID gid, SkGlyphCache* cache) {
(void)cache->findImage(cache->getGlyphIDMetrics(gid));
SkMask mask;
cache->getGlyphIDMetrics(gid).toMask(&mask);
if (!mask.fImage) {
return {nullptr, {0, 0}};
}
SkIRect bounds = mask.fBounds;
SkBitmap bm;
switch (mask.fFormat) {
case SkMask::kBW_Format:
bm.allocPixels(SkImageInfo::MakeA8(bounds.width(), bounds.height()));
for (int y = 0; y < bm.height(); ++y) {
for (int x8 = 0; x8 < bm.width(); x8 += 8) {
uint8_t v = *mask.getAddr1(x8 + bounds.x(), y + bounds.y());
int e = SkTMin(x8 + 8, bm.width());
for (int x = x8; x < e; ++x) {
*bm.getAddr8(x, y) = (v >> (x & 0x7)) & 0x1 ? 0xFF : 0x00;
}
}
}
bm.setImmutable();
return {SkImage::MakeFromBitmap(bm), {bounds.x(), bounds.y()}};
case SkMask::kA8_Format:
bm.installPixels(SkImageInfo::MakeA8(bounds.width(), bounds.height()),
mask.fImage, mask.fRowBytes);
return {SkMakeImageFromRasterBitmap(bm, kAlways_SkCopyPixelsMode),
{bounds.x(), bounds.y()}};
case SkMask::kARGB32_Format:
bm.installPixels(SkImageInfo::MakeN32Premul(bounds.width(), bounds.height()),
mask.fImage, mask.fRowBytes);
return {SkMakeImageFromRasterBitmap(bm, kAlways_SkCopyPixelsMode),
{bounds.x(), bounds.y()}};
case SkMask::k3D_Format:
case SkMask::kLCD16_Format:
default:
SkASSERT(false);
return {nullptr, {0, 0}};
}
}
static void add_type3_font_info(SkPDFCanon* canon,
SkPDFDict* font,
SkTypeface* typeface,
@ -704,12 +762,35 @@ static void add_type3_font_info(SkPDFCanon* canon,
characterName, sk_make_sp<SkPDFStream>(
std::unique_ptr<SkStreamAsset>(content.detachAsStream())));
} else {
auto pimg = to_image(gID, cache.get());
if (!pimg.fImage) {
if (!emptyStream) {
emptyStream = sk_make_sp<SkPDFStream>(
std::unique_ptr<SkStreamAsset>(
new SkMemoryStream((size_t)0)));
}
charProcs->insertObjRef(characterName, emptyStream);
} else {
SkDynamicMemoryWStream content;
SkPDFUtils::AppendScalar(SkFloatToScalar(glyph.fAdvanceX), &content);
content.writeText(" 0 d0\n");
content.writeDecAsText(pimg.fImage->width());
content.writeText(" 0 0 ");
content.writeDecAsText(-pimg.fImage->height());
content.writeText(" ");
content.writeDecAsText(pimg.fOffset.x());
content.writeText(" ");
content.writeDecAsText(pimg.fImage->height() + pimg.fOffset.y());
content.writeText(" cm\n");
content.writeText("/X Do\n");
auto proc = sk_make_sp<SkPDFStream>(content.detachAsStream());
auto d0 = sk_make_sp<SkPDFDict>();
d0->insertObjRef("X", SkPDFCreateBitmapObject(std::move(pimg.fImage)));
auto d1 = sk_make_sp<SkPDFDict>();
d1->insertObject("XObject", std::move(d0));
proc->dict()->insertObject("Resources", std::move(d1));
charProcs->insertObjRef(characterName, std::move(proc));
}
}
}
encDiffs->appendName(characterName.c_str());

7
src/pdf/SkPDFFont.h
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@ -11,13 +11,11 @@
#include "SkAdvancedTypefaceMetrics.h"
#include "SkBitSet.h"
#include "SkStrikeCache.h"
#include "SkPDFCanon.h"
#include "SkPDFTypes.h"
#include "SkStrikeCache.h"
#include "SkTypeface.h"
class SkPDFCanon;
class SkPDFFont;
/** \class SkPDFFont
A PDF Object class representing a font. The font may have resources
attached to it in order to embed the font. SkPDFFonts are canonicalized
@ -84,6 +82,7 @@ public:
* @param glyphID Specify which section of a large font is of interest.
*/
static sk_sp<SkPDFFont> GetFontResource(SkPDFCanon* canon,
SkGlyphCache* cache,
SkTypeface* typeface,
SkGlyphID glyphID);