25068 2009-04-06 18:12:12 -0700 [Chromium] Complex text support for Chromium Linux 2009-06-30 12:16:08 -0700 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) PC Linux RESOLVED FIXED P2 Normal --- 1 agl webkit-unassigned jshin playmobil oldest_to_newest 116703 0 agl 2009-04-06 18:12:12 -0700 This patch enables complex text support using the Harfbuzz library and Skia. 116704 1 29298 agl 2009-04-06 18:12:57 -0700 Created attachment 29298 patch 121437 2 29298 eric 2009-05-14 22:12:30 -0700 Comment on attachment 29298 patch Various style issues. 1. "helper" is not a very discriptive name. :) Maybe TextRunWalkerHarfbuzz TexRunWalker TextRunIterator? Since the comment seems to imply its job is to walk text runs. :) Lots of foo_bar style violations. fooBar in WK It seems HarfbuzzHelper (renamed?) could have its own header (and cpp?) file. It's big enough. Sad that HB_ShaperItem can't use OwnPtr. :( Style: 264 bool NextRTLScriptRun() 307 ssize_t m_iter; // indexes the next word in |m_run| We generally try to use full words like m_indexOfNextWord? 310 unsigned m_width; // width (in px) of the current script run m_widthInPx; m_pixelWidth; It seems all these things which pertain to m_run should be grouped with it, no? (and least in ordering, if not also in structure) I assume this is in no way temporary? 321 const FontPlatformData& font = fontDataForCharacters(run.characters(), run.length())->fontDataForCharacter(' ')->platformData(); You probably want to grab off gc->platformContext() since you use it so much: 323 SkCanvas* canvas = gc->platformContext()->canvas(); I've not seen other parts of the WebCore code use "const" for local variables: 325 const bool fill = textMode & cTextFill; Really? 377 // (Mac code ignores includePartialGlyphs, and they don't know what it's 378 // supposed to do, so we just ignore it as well.) ignored arguments generally cause warnings in the compiler, no? What is "i" here? 424 int i; 425 if (harfbuzz.rtl()) { Needs a better name. 121438 3 29298 eric 2009-05-14 22:14:55 -0700 Comment on attachment 29298 patch Bah, I hit submit early. All the places you use "harfbuzz" probably should hav ea differnet name. We don't care that we're using "harfbuzz" more that we're iterating over the text runs or? What is iter doing here? 393 ssize_t iter = 0; 394 while (iter < run.length()) { Seems that too needs a better name. r- for all the nits above. 126257 4 31363 agl 2009-06-16 12:16:15 -0700 Created attachment 31363 patch Points not addressed in code: > Really? > 377 // (Mac code ignores includePartialGlyphs, and they don't know what it's > 378 // supposed to do, so we just ignore it as well.) > ignored arguments generally cause warnings in the compiler, no? This comment was taken from the Windows code. The ignored argument doesn't trigger a warning for us in either place. > I assume this is in no way temporary? > 321 const FontPlatformData& font = fontDataForCharacters(run.characters(), run.length())->fontDataForCharacter(' ')->platformData(); It seems to be the way to get what I need. Cheers AGL 126258 5 eric 2009-06-16 12:18:44 -0700 (In reply to comment #4) > > I assume this is in no way temporary? > > 321 const FontPlatformData& font = fontDataForCharacters(run.characters(), run.length())->fontDataForCharacter(' ')->platformData(); > > It seems to be the way to get what I need. I meant that the value was not a temporary value. You're grabbing a reference to something that is likely owned by one of those objects earlier in the line. Why do we know it's still alive a couple lines later? 126279 6 agl 2009-06-16 13:52:16 -0700 To be perfectly honest, there's some amount of hope, copying other ports and "look, valgrind says it's ok". On a less hand-wavy note, the root of that font data is the Font object, and a reference to it never leaves a member function of the Font object. 126533 7 31430 agl 2009-06-17 14:11:48 -0700 Created attachment 31430 /tmp/patch Changes: * Add createGlyphArrays and deleteGlyphArrays to remove some code duplication. * Removed some enum cases where they weren't needed. * BUG (typo): stroked complex text would crash. * BUG (typo): LTR complex text could hit an assertion. * BUG: highlighting an LTR complex text run wouldn't highlight the last character.' 127768 8 31430 levin 2009-06-23 17:47:01 -0700 Comment on attachment 31430 /tmp/patch Many of my comments are style related and I'm doing an r- because there are quite a few to fix up. Even though I have tried to verify the logic, it would be great if you got someone on the chromium team more familiar with text handling to look over the code. Perhaps jshin or playmobil would be good choices. > diff --git a/WebCore/ChangeLog b/WebCore/ChangeLog > +2009-06-16 Adam Langley <agl@google.com> > + > + Reviewed by NOBODY (OOPS!). > + > + Chromium: Add complex text support on Linux. Add link to bug here. > + (WebCore::GetGlyphMetrics): > + (WebCore::GetFontMetric): > + (WebCore::): This appears to be a prepare-Changelog goof, so just delete it (or fix it if you figure out what function this should have been). > diff --git a/WebCore/platform/graphics/chromium/FontLinux.cpp b/WebCore/platform/graphics/chromium/FontLinux.cpp > +extern HB_Error harfbuzzSkiaGetTable(void* voidface, const HB_Tag tag, HB_Byte* buffer, HB_UInt* len); I'd omit the param name "tag" since it doesn't appear to add any info. > +class TextRunWalker { > +public: > + TextRunWalker(const TextRun& run, SkPaint* paint, unsigned startingX, const FontPlatformData* font) > + : m_run(run) > + , m_paint(paint) Why does this store m_paint and then never use it? > + m_item.face = HB_NewFace(const_cast<FontPlatformData*>(font), harfbuzzSkiaGetTable); > + m_item.font = (HB_FontRec*) fastMalloc(sizeof(HB_FontRec)); Use c++ style casts instead of c style casts. This place and several others. > + > + void setBackwardsIteration(bool is_backwards) is_backwards useCasingLikeThis :) . > + return m_item.glyphs > + && m_item.attributes > + && m_item.advances > + && m_item.offsets > + && m_glyphs16 > + && m_xpos; This looks rather narrow to me. (You can got beyond 80 columns if desired but if you find this more readable for this item leave it as is.) > > + > + // We overflowed our arrays. Resize and retry. > + if (!expandGlyphArrays()) > + return false; > + } > + > + HB_Fixed adv_sum = 0; Two problems with "adv_sum" 1. abbrvtn 2. theCasing > + for (unsigned i = 0; i < m_item.num_glyphs; ++i) { > + m_glyphs16[i] = m_item.glyphs[i]; > + adv_sum += m_item.advances[i] >> 6; > + } 6 is scattered through this code. (dividing by 64.) I'm not sure why. It would be good to create a static const int/unsigned for this which will help explain what this is by its name and get rid of the 6's all over the place. > + uint16_t* m_glyphs16; // a vector of 16-bit glyph ids One space before end of line comments. Also use sentences (or at least a sentence like format). Start with capital and end with period. > + SkScalar* m_xpos; // a vector of x positions for each glyph > + SkPaint* const m_paint; > + ssize_t m_indexOfNextScriptRun; // indexes the script run in |m_run| > + const unsigned m_startingX; > + unsigned m_offsetX; > + unsigned m_pixelWidth; // width (in px) of the current script run > + unsigned m_numCodePoints; // code points in current script run > + unsigned m_maxGlyphs; > + bool m_iterateBackwards; > +}; > + > +void Font::drawComplexText(GraphicsContext* gc, const TextRun& run, > const FloatPoint& point, int from, int to) const > { > - notImplemented(); > + if (run.length() == 0) Use if (run.length()) (avoid comparisons to 0) > + return; > + > + const FontPlatformData& font = fontDataForCharacters(run.characters(), run.length())->fontDataForCharacter(' ')->platformData(); > + PlatformGraphicsContext* pgc = gc->platformContext(); Avoid abbreviations "pgc". Maybe graphicsContext instead? > + bool stroke = (textMode & cTextStroke) > + && pgc->getStrokeStyle() != NoStroke > + && pgc->getStrokeThickness() > 0; Why not put this all on one line? (If you leave it like this, then the continuation lines should only be indented 4 spaces.) > + > + TextRunWalker walker(run, stroke ? &strokePaint : &fillPaint, point.x(), &font); It looks like fill and stroke may both be true? Why is only one passed into to this class? (Actually I would just get rid of that parameter from TextRunWalker.) > + return basePosition + j; > + } > + > + ASSERT(false); s/ ASSERT(false);/ASSERT_NOT_REACHED();/ > > +// Return the rectangle for selecting the given range of code-points in the > +// TextRun. This is an odd line break. In WebKit code, you are certainly not limited to 80 columns > FloatRect Font::selectionRectForComplexText(const TextRun& run, > const IntPoint& point, int h, "h" use unabbreviated names. > > + // the position in question might be just after the text Use sentence formatting. > +++ b/WebCore/platform/graphics/chromium/HarfbuzzSkia.cpp > + * Copyright (c) 2009, Google Inc. All rights reserved. Change like this: "Copyright (C) 2009 Google Inc. All rights reserved." > +#include <harfbuzz-shaper.h> Previously you did #include "harfbuzz-shaper.h" > + > +static HB_Fixed SkiaScalarToHarfbuzzFixed(SkScalar v) What does "v" represent? (Please change the variable name to something better.) > +static HB_Bool StringToGlyphs(HB_Font hbFont, const HB_UChar16* chars, hb_uint32 len, HB_Glyph* glyphs, hb_uint32* glyphsSize, HB_Bool isRTL) Avoid abbreviations. Change variable names to something like: character length > + memcpy(&value, reinterpret_cast<uint8_t*>(glyphs) + sizeof(uint16_t) * i, sizeof(uint16_t)); reinterpret_cast<uint8_t*>(glyphs) + sizeof(uint16_t) * i This looks wrong, but I get it. What do you think about this instead? reinterpret_cast<uint16_t*>(glyphs) + i > +static void GlyphsToAdvances(HB_Font hbFont, const HB_Glyph* glyphs, hb_uint32 numGlyphs, HB_Fixed* advances, int flags) flags appears unused. Is that a bug? > + // We use a memcpy to avoid breaking strict aliasing rules. > + memcpy(&value, reinterpret_cast<uint8_t*>(advances) + sizeof(float) * i, sizeof(float)); Same comment about "reinterpret_cast<uint8_t*>(advances) + sizeof(float) * i" as before. > + font->setupPaint(&paint); > + paint.setTextEncoding(SkPaint::kUTF16_TextEncoding); > + > + uint16_t* glyphs16 = (uint16_t*) fastMalloc(sizeof(uint16_t) * len); Why the use of fastMalloc vs plain old new? And if you switch to new, it would be good to adopt OwnPtr (from wtf/OwnPtr.h). You can think of this like a scoped_ptr. > + for (int i = 0; i < numGlyphs; ++i) { > + if (glyphs16[i] == 0) { Avoid comparisons to 0. > + canRender = false; > + > +static HB_Error GetOutlinePoint(HB_Font hbFont, HB_Glyph glyph, int flags, hb_uint32 point, HB_Fixed* xpos, HB_Fixed* ypos, hb_uint32* nPoints) s/xpos/xPos/ s/ypos/yPos/ What is nPoints? It looks like an abbreviation. > + SkPath path; > + paint.getTextPath(&glyph16, sizeof(glyph16), 0, 0, &path); > + int numPoints = path.getPoints(NULL, 0); Use 0 instead of NULL. > +static HB_Fixed GetFontMetric(HB_Font hbFont, HB_FontMetric metric) > +{ ... > + switch (metric) { > + case HB_FontAscent: > + return SkiaScalarToHarfbuzzFixed(-skiaMetrics.fAscent); > + default: > + return 0; > + } This looks odd to me. Why a switch instead of an "if"? (since there is only one case statement) 127998 9 31811 agl 2009-06-24 14:13:19 -0700 Created attachment 31811 patch On Tue, Jun 23, 2009 at 5:47 PM, <bugzilla-daemon@webkit.org> wrote: > Even though I have tried to verify the logic, it would be great if you got > someone on the chromium team more familiar with text handling to look over the > code.  Perhaps jshin or playmobil would be good choices. jshin declined to review it. At this point, having something is better than nothing. We're have security bugs which rely on our non-painting of complex text. > Why does this store m_paint and then never use it? It does use it, but the code got moved to the constructor. I've removed the member variable. > 6 is scattered through this code.  (dividing by 64.)  I'm not sure why. > It would be good to create a static const int/unsigned for this which will help > explain what this is by its name and get rid of the 6's all over the place. Have added a static function. I hope it doesn't introduce any signness bugs. > Avoid abbreviations "pgc". > Maybe graphicsContext instead? I only did this because Eric asked. Changing it back then. > (If you leave it like this, then the continuation lines should only be indented > 4 spaces.) The style guide has the operators lining up on the left hand side. > reinterpret_cast<uint8_t*>(glyphs) + sizeof(uint16_t) * i > > This looks wrong, but I get it. What do you think about this instead? Sorry, it is wrong. It should a char*, I thought that unsigned char* was special cased in the strict alias rules but, now that I check, it doesn't appear so. >> +static void GlyphsToAdvances(HB_Font hbFont, const HB_Glyph* glyphs, hb_uint32 numGlyphs, HB_Fixed* advances, int flags) > > flags appears unused.  Is that a bug? It's not used in the Harfbuzz reference code either. > Why the use of fastMalloc vs plain old new? > And if you switch to new, it would be good to adopt OwnPtr (from wtf/OwnPtr.h). > You can think of this like a scoped_ptr. I think I can use OwnArrayPtr. >> +    SkPath path; >> +    paint.getTextPath(&glyph16, sizeof(glyph16), 0, 0, &path); >> +    int numPoints = path.getPoints(NULL, 0); > > Use 0 instead of NULL. I know that style guide says this, but this is so manifestly wrong in this case that I'm going to leave it. >> +    switch (metric) { >> +    case HB_FontAscent: >> +        return SkiaScalarToHarfbuzzFixed(-skiaMetrics.fAscent); >> +    default: >> +        return 0; >> +    } > > This looks odd to me.  Why a switch instead of an "if"? (since there is only > one case statement) I'm going to leave it as a switch statement because it makes it clearer that we may need to support other values in the future. AGL 128240 10 levin 2009-06-25 12:45:54 -0700 I pinged jshin@chromium.org and he agreed to look this over. 128241 11 jshin 2009-06-25 12:47:51 -0700 David alerted me about this I didn't know about before (unless my memory is really faulty :-)). I'll take a look. 128246 12 agl 2009-06-25 13:12:53 -0700 jshik: I did email you ages ago. I think you even responded :) But thanks for taking a look. To be clear, there are known bugs in this code which will need to some work to fix, but this patch has been outstanding for months and I just want to land it at this point. Some complex text support is better than none at the moment. 128889 13 31811 eric 2009-06-29 14:17:24 -0700 Comment on attachment 31811 patch God I hate C. Style: 322 bool NextRTLScriptRun() 352 bool NextLTRScriptRun() Why copy/paste here? 571 if (fromX == -1 && from < walker.numCodePoints()) { 572 // |from| is within this script run. So we index the clusters log to 573 // find which glyph this code-point contributed to and find its x 574 // position. 575 int glyph = walker.logClusters()[from]; 576 fromX = base + walker.xPositions()[glyph]; 577 fromAdvance = walker.advances()[glyph]; 578 } else 579 from -= walker.numCodePoints(); 580 581 if (toX == -1 && to < walker.numCodePoints()) { 582 int glyph = walker.logClusters()[to]; 583 toX = base + walker.xPositions()[glyph]; 584 toAdvance = walker.advances()[glyph]; 585 } else 586 to -= walker.numCodePoints(); Again: 593 // The position in question might be just after the text. 594 const int rightEdge = base; 595 if (fromX == -1 && !from) 596 fromX = leftEdge; 597 else if (walker.rtl()) 598 fromX += truncateFixedPointToInteger(fromAdvance); 599 600 if (toX == -1 && !to) 601 toX = rightEdge; 602 else if (!walker.rtl()) 603 toX += truncateFixedPointToInteger(toAdvance); Style: 51 static HB_Fixed SkiaScalarToHarfbuzzFixed(SkScalar value) 57 static HB_Bool StringToGlyphs(HB_Font hbFont, const HB_UChar16* characters, hb_uint32 length, HB_Glyph* glyphs, hb_uint32* glyphsSize, HB_Bool isRTL) 79 static void GlyphsToAdvances(HB_Font hbFont, const HB_Glyph* glyphs, hb_uint32 numGlyphs, HB_Fixed* advances, int flags) 105 static HB_Bool CanRender(HB_Font hbFont, const HB_UChar16* characters, hb_uint32 length) Style: 197 HB_FontClass harfbuzzSkiaClass = { 198 StringToGlyphs, 199 GlyphsToAdvances, 200 CanRender, 201 GetOutlinePoint, 202 GetGlyphMetrics, 203 GetFontMetric, 204 }; This would probably have been easier in smaller pieces? This code is pretty ugly. Mostly because it's C... and hard enough to stomach in small chunks. Silly manual memory management. I still don't really know what this all is. But at some level it doesn't matter. This is your port, and I don't need to be a gate keeper. Please post a new patch with fixed style though. 128909 14 eric 2009-06-29 16:03:57 -0700 I reviewed this with Adam in person. 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