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gecko-dev/gfx/thebes/gfxGDIFont.cpp

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Foundation code.
*
* The Initial Developer of the Original Code is Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2005-2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Stuart Parmenter <stuart@mozilla.com>
* Masayuki Nakano <masayuki@d-toybox.com>
* Mats Palmgren <mats.palmgren@bredband.net>
* John Daggett <jdaggett@mozilla.com>
* Jonathan Kew <jfkthame@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "gfxGDIFont.h"
#include "gfxGDIShaper.h"
#include "gfxUniscribeShaper.h"
#include "gfxHarfBuzzShaper.h"
#include "gfxWindowsPlatform.h"
#include "gfxContext.h"
#include "gfxUnicodeProperties.h"
#include "cairo-win32.h"
#define ROUND(x) floor((x) + 0.5)
static inline cairo_antialias_t
GetCairoAntialiasOption(gfxFont::AntialiasOption anAntialiasOption)
{
switch (anAntialiasOption) {
default:
case gfxFont::kAntialiasDefault:
return CAIRO_ANTIALIAS_DEFAULT;
case gfxFont::kAntialiasNone:
return CAIRO_ANTIALIAS_NONE;
case gfxFont::kAntialiasGrayscale:
return CAIRO_ANTIALIAS_GRAY;
case gfxFont::kAntialiasSubpixel:
return CAIRO_ANTIALIAS_SUBPIXEL;
}
}
gfxGDIFont::gfxGDIFont(GDIFontEntry *aFontEntry,
const gfxFontStyle *aFontStyle,
PRBool aNeedsBold,
AntialiasOption anAAOption)
: gfxFont(aFontEntry, aFontStyle, anAAOption),
mFont(NULL),
mFontFace(nsnull),
mScaledFont(nsnull),
mMetrics(nsnull),
mSpaceGlyph(0),
mNeedsBold(aNeedsBold)
{
if (FontCanSupportHarfBuzz()) {
mHarfBuzzShaper = new gfxHarfBuzzShaper(this);
}
}
gfxGDIFont::~gfxGDIFont()
{
if (mScaledFont) {
cairo_scaled_font_destroy(mScaledFont);
}
if (mFontFace) {
cairo_font_face_destroy(mFontFace);
}
if (mFont) {
::DeleteObject(mFont);
}
delete mMetrics;
}
void
gfxGDIFont::CreatePlatformShaper()
{
mPlatformShaper = new gfxGDIShaper(this);
}
gfxFont*
gfxGDIFont::CopyWithAntialiasOption(AntialiasOption anAAOption)
{
return new gfxGDIFont(static_cast<GDIFontEntry*>(mFontEntry.get()),
&mStyle, mNeedsBold, anAAOption);
}
static PRBool
UseUniscribe(gfxTextRun *aTextRun,
const PRUnichar *aString,
PRUint32 aRunStart,
PRUint32 aRunLength)
{
PRUint32 flags = aTextRun->GetFlags();
PRBool useGDI;
PRBool isXP = (gfxWindowsPlatform::WindowsOSVersion()
< gfxWindowsPlatform::kWindowsVista);
// bug 561304 - Uniscribe bug produces bad positioning at certain
// font sizes on XP, so default to GDI on XP using logic of 3.6
useGDI = isXP &&
(flags &
(gfxTextRunFactory::TEXT_OPTIMIZE_SPEED |
gfxTextRunFactory::TEXT_IS_RTL)
) == gfxTextRunFactory::TEXT_OPTIMIZE_SPEED;
return !useGDI ||
ScriptIsComplex(aString + aRunStart, aRunLength, SIC_COMPLEX) == S_OK;
}
PRBool
gfxGDIFont::InitTextRun(gfxContext *aContext,
gfxTextRun *aTextRun,
const PRUnichar *aString,
PRUint32 aRunStart,
PRUint32 aRunLength,
PRInt32 aRunScript,
PRBool aPreferPlatformShaping)
{
if (!mMetrics) {
Initialize();
}
if (!mIsValid) {
NS_WARNING("invalid font! expect incorrect text rendering");
return PR_FALSE;
}
PRBool ok = PR_FALSE;
// ensure the cairo font is set up, so there's no risk it'll fall back to
// creating a "toy" font internally (see bug 544617)
SetupCairoFont(aContext);
if (mHarfBuzzShaper) {
if (gfxPlatform::GetPlatform()->UseHarfBuzzForScript(aRunScript)) {
ok = mHarfBuzzShaper->InitTextRun(aContext, aTextRun, aString,
aRunStart, aRunLength,
aRunScript);
}
}
if (!ok) {
GDIFontEntry *fe = static_cast<GDIFontEntry*>(GetFontEntry());
PRBool preferUniscribe =
(!fe->IsTrueType() || fe->IsSymbolFont()) && !fe->mForceGDI;
if (preferUniscribe ||
UseUniscribe(aTextRun, aString, aRunStart, aRunLength))
{
// first try Uniscribe
if (!mUniscribeShaper) {
mUniscribeShaper = new gfxUniscribeShaper(this);
}
ok = mUniscribeShaper->InitTextRun(aContext, aTextRun, aString,
aRunStart, aRunLength,
aRunScript);
if (ok) {
return PR_TRUE;
}
// fallback to GDI shaping
if (!mPlatformShaper) {
CreatePlatformShaper();
}
ok = mPlatformShaper->InitTextRun(aContext, aTextRun, aString,
aRunStart, aRunLength,
aRunScript);
} else {
// first use GDI
if (!mPlatformShaper) {
CreatePlatformShaper();
}
ok = mPlatformShaper->InitTextRun(aContext, aTextRun, aString,
aRunStart, aRunLength,
aRunScript);
if (ok) {
return PR_TRUE;
}
// try Uniscribe if GDI failed
if (!mUniscribeShaper) {
mUniscribeShaper = new gfxUniscribeShaper(this);
}
// use Uniscribe shaping
ok = mUniscribeShaper->InitTextRun(aContext, aTextRun, aString,
aRunStart, aRunLength,
aRunScript);
}
#if DEBUG
if (!ok) {
NS_ConvertUTF16toUTF8 name(GetName());
char msg[256];
sprintf(msg,
"text shaping with both uniscribe and GDI failed for"
" font: %s",
name.get());
NS_WARNING(msg);
}
#endif
}
return ok;
}
const gfxFont::Metrics&
gfxGDIFont::GetMetrics()
{
if (!mMetrics) {
Initialize();
}
return *mMetrics;
}
PRUint32
gfxGDIFont::GetSpaceGlyph()
{
if (!mMetrics) {
Initialize();
}
return mSpaceGlyph;
}
PRBool
gfxGDIFont::SetupCairoFont(gfxContext *aContext)
{
if (!mMetrics) {
Initialize();
}
if (!mScaledFont ||
cairo_scaled_font_status(mScaledFont) != CAIRO_STATUS_SUCCESS) {
// Don't cairo_set_scaled_font as that would propagate the error to
// the cairo_t, precluding any further drawing.
return PR_FALSE;
}
cairo_set_scaled_font(aContext->GetCairo(), mScaledFont);
return PR_TRUE;
}
gfxFont::RunMetrics
gfxGDIFont::Measure(gfxTextRun *aTextRun,
PRUint32 aStart, PRUint32 aEnd,
BoundingBoxType aBoundingBoxType,
gfxContext *aRefContext,
Spacing *aSpacing)
{
gfxFont::RunMetrics metrics =
gfxFont::Measure(aTextRun, aStart, aEnd,
aBoundingBoxType, aRefContext, aSpacing);
// if aBoundingBoxType is LOOSE_INK_EXTENTS
// and the underlying cairo font may be antialiased,
// we can't trust Windows to have considered all the pixels
// so we need to add "padding" to the bounds.
// (see bugs 475968, 439831, compare also bug 445087)
if (aBoundingBoxType == LOOSE_INK_EXTENTS &&
mAntialiasOption != kAntialiasNone &&
metrics.mBoundingBox.width > 0) {
metrics.mBoundingBox.x -= aTextRun->GetAppUnitsPerDevUnit();
metrics.mBoundingBox.width += aTextRun->GetAppUnitsPerDevUnit() * 3;
}
return metrics;
}
void
gfxGDIFont::Initialize()
{
NS_ASSERTION(!mMetrics, "re-creating metrics? this will leak");
LOGFONTW logFont;
if (mAdjustedSize == 0.0) {
mAdjustedSize = mStyle.size;
if (mStyle.sizeAdjust != 0.0 && mAdjustedSize > 0.0) {
// to implement font-size-adjust, we first create the "unadjusted" font
FillLogFont(logFont, mAdjustedSize);
mFont = ::CreateFontIndirectW(&logFont);
// initialize its metrics so we can calculate size adjustment
Initialize();
// calculate the properly adjusted size, and then proceed
// to recreate mFont and recalculate metrics
gfxFloat aspect = mMetrics->xHeight / mMetrics->emHeight;
mAdjustedSize = mStyle.GetAdjustedSize(aspect);
// delete the temporary font and metrics
::DeleteObject(mFont);
mFont = nsnull;
delete mMetrics;
mMetrics = nsnull;
}
}
mAdjustedSize = ROUND(mAdjustedSize);
FillLogFont(logFont, mAdjustedSize);
mFont = ::CreateFontIndirectW(&logFont);
mMetrics = new gfxFont::Metrics;
::memset(mMetrics, 0, sizeof(*mMetrics));
AutoDC dc;
SetGraphicsMode(dc.GetDC(), GM_ADVANCED);
AutoSelectFont selectFont(dc.GetDC(), mFont);
// Get font metrics
OUTLINETEXTMETRIC oMetrics;
TEXTMETRIC& metrics = oMetrics.otmTextMetrics;
if (0 < GetOutlineTextMetrics(dc.GetDC(), sizeof(oMetrics), &oMetrics)) {
mMetrics->superscriptOffset = (double)oMetrics.otmptSuperscriptOffset.y;
// Some fonts have wrong sign on their subscript offset, bug 410917.
mMetrics->subscriptOffset = fabs((double)oMetrics.otmptSubscriptOffset.y);
mMetrics->strikeoutSize = (double)oMetrics.otmsStrikeoutSize;
mMetrics->strikeoutOffset = (double)oMetrics.otmsStrikeoutPosition;
mMetrics->underlineSize = (double)oMetrics.otmsUnderscoreSize;
mMetrics->underlineOffset = (double)oMetrics.otmsUnderscorePosition;
const MAT2 kIdentityMatrix = { {0, 1}, {0, 0}, {0, 0}, {0, 1} };
GLYPHMETRICS gm;
DWORD len = GetGlyphOutlineW(dc.GetDC(), PRUnichar('x'), GGO_METRICS, &gm, 0, nsnull, &kIdentityMatrix);
if (len == GDI_ERROR || gm.gmptGlyphOrigin.y <= 0) {
// 56% of ascent, best guess for true type
mMetrics->xHeight =
ROUND((double)metrics.tmAscent * DEFAULT_XHEIGHT_FACTOR);
} else {
mMetrics->xHeight = gm.gmptGlyphOrigin.y;
}
mMetrics->emHeight = metrics.tmHeight - metrics.tmInternalLeading;
gfxFloat typEmHeight = (double)oMetrics.otmAscent - (double)oMetrics.otmDescent;
mMetrics->emAscent = ROUND(mMetrics->emHeight * (double)oMetrics.otmAscent / typEmHeight);
mMetrics->emDescent = mMetrics->emHeight - mMetrics->emAscent;
if (oMetrics.otmEMSquare > 0) {
mFUnitsConvFactor = float(mAdjustedSize / oMetrics.otmEMSquare);
}
} else {
// Make a best-effort guess at extended metrics
// this is based on general typographic guidelines
// GetTextMetrics can fail if the font file has been removed
// or corrupted recently.
BOOL result = GetTextMetrics(dc.GetDC(), &metrics);
if (!result) {
NS_WARNING("Missing or corrupt font data, fasten your seatbelt");
mIsValid = PR_FALSE;
memset(mMetrics, 0, sizeof(*mMetrics));
return;
}
mMetrics->xHeight =
ROUND((float)metrics.tmAscent * DEFAULT_XHEIGHT_FACTOR);
mMetrics->superscriptOffset = mMetrics->xHeight;
mMetrics->subscriptOffset = mMetrics->xHeight;
mMetrics->strikeoutSize = 1;
mMetrics->strikeoutOffset = ROUND(mMetrics->xHeight * 0.5f); // 50% of xHeight
mMetrics->underlineSize = 1;
mMetrics->underlineOffset = -ROUND((float)metrics.tmDescent * 0.30f); // 30% of descent
mMetrics->emHeight = metrics.tmHeight - metrics.tmInternalLeading;
mMetrics->emAscent = metrics.tmAscent - metrics.tmInternalLeading;
mMetrics->emDescent = metrics.tmDescent;
}
mMetrics->internalLeading = metrics.tmInternalLeading;
mMetrics->externalLeading = metrics.tmExternalLeading;
mMetrics->maxHeight = metrics.tmHeight;
mMetrics->maxAscent = metrics.tmAscent;
mMetrics->maxDescent = metrics.tmDescent;
mMetrics->maxAdvance = metrics.tmMaxCharWidth;
mMetrics->aveCharWidth = NS_MAX<gfxFloat>(1, metrics.tmAveCharWidth);
// The font is monospace when TMPF_FIXED_PITCH is *not* set!
// See http://msdn2.microsoft.com/en-us/library/ms534202(VS.85).aspx
if (!(metrics.tmPitchAndFamily & TMPF_FIXED_PITCH)) {
mMetrics->maxAdvance = mMetrics->aveCharWidth;
}
// Cache the width of a single space.
SIZE size;
GetTextExtentPoint32W(dc.GetDC(), L" ", 1, &size);
mMetrics->spaceWidth = ROUND(size.cx);
// Cache the width of digit zero.
// XXX MSDN (http://msdn.microsoft.com/en-us/library/ms534223.aspx)
// does not say what the failure modes for GetTextExtentPoint32 are -
// is it safe to assume it will fail iff the font has no '0'?
if (GetTextExtentPoint32W(dc.GetDC(), L"0", 1, &size)) {
mMetrics->zeroOrAveCharWidth = ROUND(size.cx);
} else {
mMetrics->zeroOrAveCharWidth = mMetrics->aveCharWidth;
}
mSpaceGlyph = 0;
if (metrics.tmPitchAndFamily & TMPF_TRUETYPE) {
WORD glyph;
DWORD ret = GetGlyphIndicesW(dc.GetDC(), L" ", 1, &glyph,
GGI_MARK_NONEXISTING_GLYPHS);
if (ret != GDI_ERROR && glyph != 0xFFFF) {
mSpaceGlyph = glyph;
}
}
SanitizeMetrics(mMetrics, GetFontEntry()->mIsBadUnderlineFont);
mFontFace = cairo_win32_font_face_create_for_logfontw_hfont(&logFont,
mFont);
cairo_matrix_t sizeMatrix, ctm;
cairo_matrix_init_identity(&ctm);
cairo_matrix_init_scale(&sizeMatrix, mAdjustedSize, mAdjustedSize);
cairo_font_options_t *fontOptions = cairo_font_options_create();
if (mAntialiasOption != kAntialiasDefault) {
cairo_font_options_set_antialias(fontOptions,
GetCairoAntialiasOption(mAntialiasOption));
}
mScaledFont = cairo_scaled_font_create(mFontFace, &sizeMatrix,
&ctm, fontOptions);
cairo_font_options_destroy(fontOptions);
if (!mScaledFont ||
cairo_scaled_font_status(mScaledFont) != CAIRO_STATUS_SUCCESS) {
#ifdef DEBUG
char warnBuf[1024];
sprintf(warnBuf, "Failed to create scaled font: %s status: %d",
NS_ConvertUTF16toUTF8(mFontEntry->Name()).get(),
mScaledFont ? cairo_scaled_font_status(mScaledFont) : 0);
NS_WARNING(warnBuf);
#endif
}
mIsValid = PR_TRUE;
#if 0
printf("Font: %p (%s) size: %f\n", this,
NS_ConvertUTF16toUTF8(GetName()).get(), mStyle.size);
printf(" emHeight: %f emAscent: %f emDescent: %f\n", mMetrics.emHeight, mMetrics.emAscent, mMetrics.emDescent);
printf(" maxAscent: %f maxDescent: %f maxAdvance: %f\n", mMetrics.maxAscent, mMetrics.maxDescent, mMetrics.maxAdvance);
printf(" internalLeading: %f externalLeading: %f\n", mMetrics.internalLeading, mMetrics.externalLeading);
printf(" spaceWidth: %f aveCharWidth: %f xHeight: %f\n", mMetrics.spaceWidth, mMetrics.aveCharWidth, mMetrics.xHeight);
printf(" uOff: %f uSize: %f stOff: %f stSize: %f supOff: %f subOff: %f\n",
mMetrics.underlineOffset, mMetrics.underlineSize, mMetrics.strikeoutOffset, mMetrics.strikeoutSize,
mMetrics.superscriptOffset, mMetrics.subscriptOffset);
#endif
}
void
gfxGDIFont::FillLogFont(LOGFONTW& aLogFont, gfxFloat aSize)
{
GDIFontEntry *fe = static_cast<GDIFontEntry*>(GetFontEntry());
PRUint16 weight = mNeedsBold ? 700 : fe->Weight();
PRBool italic = (mStyle.style & (FONT_STYLE_ITALIC | FONT_STYLE_OBLIQUE));
// if user font, disable italics/bold if defined to be italics/bold face
// this avoids unwanted synthetic italics/bold
if (fe->mIsUserFont) {
if (fe->IsItalic())
italic = PR_FALSE; // avoid synthetic italic
if (fe->IsBold() || !mNeedsBold) {
// avoid GDI synthetic bold which occurs when weight
// specified is >= font data weight + 200
weight = 200;
}
}
fe->FillLogFont(&aLogFont, italic, weight, aSize,
(mAntialiasOption == kAntialiasSubpixel) ? PR_TRUE : PR_FALSE);
}
PRInt32
gfxGDIFont::GetGlyphWidth(gfxContext *aCtx, PRUint16 aGID)
{
if (!mGlyphWidths.IsInitialized()) {
mGlyphWidths.Init(200);
}
PRInt32 width;
if (mGlyphWidths.Get(aGID, &width)) {
return width;
}
DCFromContext dc(aCtx);
AutoSelectFont fs(dc, GetHFONT());
int devWidth;
if (GetCharWidthI(dc, aGID, 1, NULL, &devWidth)) {
// ensure width is positive, 16.16 fixed-point value
width = (devWidth & 0x7fff) << 16;
mGlyphWidths.Put(aGID, width);
return width;
}
return -1;
}
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