void PredefinedSymRenderer::registerSymbol( unsigned int symbol, std::string const& str )
{
if( unlikely(!this->renderBuffer_.empty()) ) {
CINAMO_EXCEPTION(Exception, "[BUG] Oops. PredefinedSymRenderer already compiled.");
}
auto it = this->entryTable_.find(symbol);
if(it != this->entryTable_.end()){
this->log().w(TAG, "Symbol: %d is already defined, and replaced with: %s", symbol, str.c_str());
this->entryTable_.erase(it);
}
Entry ent;
ent.str = str;
ent.glyphs = font_->lookupGlyph(str, size_, ascent_, descent_, height_);
int totalX = 0;
for(Handler<BitmapGlyph> const& g : ent.glyphs){
totalX += g->get()->root.advance.x;
}
float const width = FLOAT_FROM_16_16(totalX);
ent.areaInSprite.width(width);
ent.areaInSprite.height(height_);
this->maxWidth_ = geom::max(width, maxWidth_);
this->entryTable_.insert( std::pair<unsigned int, Entry >( symbol, ent ) );
}
void
gfxFT2LockedFace::GetMetrics(gfxFont::Metrics* aMetrics,
PRUint32* aSpaceGlyph)
{
NS_PRECONDITION(aMetrics != NULL, "aMetrics must not be NULL");
NS_PRECONDITION(aSpaceGlyph != NULL, "aSpaceGlyph must not be NULL");
if (NS_UNLIKELY(!mFace)) {
// No face. This unfortunate situation might happen if the font
// file is (re)moved at the wrong time.
aMetrics->emHeight = mGfxFont->GetStyle()->size;
aMetrics->emAscent = 0.8 * aMetrics->emHeight;
aMetrics->emDescent = 0.2 * aMetrics->emHeight;
aMetrics->maxAscent = aMetrics->emAscent;
aMetrics->maxDescent = aMetrics->maxDescent;
aMetrics->maxHeight = aMetrics->emHeight;
aMetrics->internalLeading = 0.0;
aMetrics->externalLeading = 0.2 * aMetrics->emHeight;
aSpaceGlyph = 0;
aMetrics->spaceWidth = 0.5 * aMetrics->emHeight;
aMetrics->maxAdvance = aMetrics->spaceWidth;
aMetrics->aveCharWidth = aMetrics->spaceWidth;
aMetrics->zeroOrAveCharWidth = aMetrics->spaceWidth;
aMetrics->xHeight = 0.5 * aMetrics->emHeight;
aMetrics->underlineSize = aMetrics->emHeight / 14.0;
aMetrics->underlineOffset = -aMetrics->underlineSize;
aMetrics->strikeoutOffset = 0.25 * aMetrics->emHeight;
aMetrics->strikeoutSize = aMetrics->underlineSize;
aMetrics->superscriptOffset = aMetrics->xHeight;
aMetrics->subscriptOffset = aMetrics->xHeight;
return;
}
const FT_Size_Metrics& ftMetrics = mFace->size->metrics;
gfxFloat emHeight;
// Scale for vertical design metric conversion: pixels per design unit.
gfxFloat yScale;
if (FT_IS_SCALABLE(mFace)) {
// Prefer FT_Size_Metrics::x_scale to x_ppem as x_ppem does not
// have subpixel accuracy.
//
// FT_Size_Metrics::y_scale is in 16.16 fixed point format. Its
// (fractional) value is a factor that converts vertical metrics from
// design units to units of 1/64 pixels, so that the result may be
// interpreted as pixels in 26.6 fixed point format.
yScale = FLOAT_FROM_26_6(FLOAT_FROM_16_16(ftMetrics.y_scale));
emHeight = mFace->units_per_EM * yScale;
} else { // Not scalable.
// FT_Size_Metrics doc says x_scale is "only relevant for scalable
// font formats".
gfxFloat emUnit = mFace->units_per_EM;
emHeight = ftMetrics.y_ppem;
yScale = emHeight / emUnit;
}
TT_OS2 *os2 =
static_cast<TT_OS2*>(FT_Get_Sfnt_Table(mFace, ft_sfnt_os2));
aMetrics->maxAscent = FLOAT_FROM_26_6(ftMetrics.ascender);
aMetrics->maxDescent = -FLOAT_FROM_26_6(ftMetrics.descender);
aMetrics->maxAdvance = FLOAT_FROM_26_6(ftMetrics.max_advance);
gfxFloat lineHeight;
if (os2 && os2->sTypoAscender) {
aMetrics->emAscent = os2->sTypoAscender * yScale;
aMetrics->emDescent = -os2->sTypoDescender * yScale;
FT_Short typoHeight =
os2->sTypoAscender - os2->sTypoDescender + os2->sTypoLineGap;
lineHeight = typoHeight * yScale;
// maxAscent/maxDescent get used for frame heights, and some fonts
// don't have the HHEA table ascent/descent set (bug 279032).
if (aMetrics->emAscent > aMetrics->maxAscent)
aMetrics->maxAscent = aMetrics->emAscent;
if (aMetrics->emDescent > aMetrics->maxDescent)
aMetrics->maxDescent = aMetrics->emDescent;
} else {
aMetrics->emAscent = aMetrics->maxAscent;
aMetrics->emDescent = aMetrics->maxDescent;
lineHeight = FLOAT_FROM_26_6(ftMetrics.height);
}
cairo_text_extents_t extents;
*aSpaceGlyph = GetCharExtents(' ', &extents);
if (*aSpaceGlyph) {
aMetrics->spaceWidth = extents.x_advance;
} else {
aMetrics->spaceWidth = aMetrics->maxAdvance; // guess
}
aMetrics->zeroOrAveCharWidth = 0.0;
if (GetCharExtents('0', &extents)) {
aMetrics->zeroOrAveCharWidth = extents.x_advance;
}
// Prefering a measured x over sxHeight because sxHeight doesn't consider
// hinting, but maybe the x extents are not quite right in some fancy
// script fonts. CSS 2.1 suggests possibly using the height of an "o",
// which would have a more consistent glyph across fonts.
if (GetCharExtents('x', &extents) && extents.y_bearing < 0.0) {
aMetrics->xHeight = -extents.y_bearing;
aMetrics->aveCharWidth = extents.x_advance;
} else {
if (os2 && os2->sxHeight) {
aMetrics->xHeight = os2->sxHeight * yScale;
} else {
// CSS 2.1, section 4.3.2 Lengths: "In the cases where it is
// impossible or impractical to determine the x-height, a value of
// 0.5em should be used."
aMetrics->xHeight = 0.5 * emHeight;
}
aMetrics->aveCharWidth = 0.0; // updated below
}
// aveCharWidth is used for the width of text input elements so be
// liberal rather than conservative in the estimate.
if (os2 && os2->xAvgCharWidth) {
// Round to pixels as this is compared with maxAdvance to guess
// whether this is a fixed width font.
gfxFloat avgCharWidth =
ScaleRoundDesignUnits(os2->xAvgCharWidth, ftMetrics.x_scale);
aMetrics->aveCharWidth =
NS_MAX(aMetrics->aveCharWidth, avgCharWidth);
}
aMetrics->aveCharWidth =
NS_MAX(aMetrics->aveCharWidth, aMetrics->zeroOrAveCharWidth);
if (aMetrics->aveCharWidth == 0.0) {
aMetrics->aveCharWidth = aMetrics->spaceWidth;
}
if (aMetrics->zeroOrAveCharWidth == 0.0) {
aMetrics->zeroOrAveCharWidth = aMetrics->aveCharWidth;
}
// Apparently hinting can mean that max_advance is not always accurate.
aMetrics->maxAdvance =
NS_MAX(aMetrics->maxAdvance, aMetrics->aveCharWidth);
// gfxFont::Metrics::underlineOffset is the position of the top of the
// underline.
//
// FT_FaceRec documentation describes underline_position as "the
// center of the underlining stem". This was the original definition
// of the PostScript metric, but in the PostScript table of OpenType
// fonts the metric is "the top of the underline"
// (http://www.microsoft.com/typography/otspec/post.htm), and FreeType
// (up to version 2.3.7) doesn't make any adjustment.
//
// Therefore get the underline position directly from the table
// ourselves when this table exists. Use FreeType's metrics for
// other (including older PostScript) fonts.
if (mFace->underline_position && mFace->underline_thickness) {
aMetrics->underlineSize = mFace->underline_thickness * yScale;
TT_Postscript *post = static_cast<TT_Postscript*>
(FT_Get_Sfnt_Table(mFace, ft_sfnt_post));
if (post && post->underlinePosition) {
aMetrics->underlineOffset = post->underlinePosition * yScale;
} else {
aMetrics->underlineOffset = mFace->underline_position * yScale
+ 0.5 * aMetrics->underlineSize;
}
} else { // No underline info.
// Imitate Pango.
aMetrics->underlineSize = emHeight / 14.0;
aMetrics->underlineOffset = -aMetrics->underlineSize;
}
if (os2 && os2->yStrikeoutSize && os2->yStrikeoutPosition) {
aMetrics->strikeoutSize = os2->yStrikeoutSize * yScale;
aMetrics->strikeoutOffset = os2->yStrikeoutPosition * yScale;
} else { // No strikeout info.
aMetrics->strikeoutSize = aMetrics->underlineSize;
// Use OpenType spec's suggested position for Roman font.
aMetrics->strikeoutOffset = emHeight * 409.0 / 2048.0
+ 0.5 * aMetrics->strikeoutSize;
}
SnapLineToPixels(aMetrics->strikeoutOffset, aMetrics->strikeoutSize);
if (os2 && os2->ySuperscriptYOffset) {
gfxFloat val = ScaleRoundDesignUnits(os2->ySuperscriptYOffset,
ftMetrics.y_scale);
aMetrics->superscriptOffset = NS_MAX(1.0, val);
} else {
aMetrics->superscriptOffset = aMetrics->xHeight;
}
if (os2 && os2->ySubscriptYOffset) {
gfxFloat val = ScaleRoundDesignUnits(os2->ySubscriptYOffset,
ftMetrics.y_scale);
// some fonts have the incorrect sign.
val = fabs(val);
aMetrics->subscriptOffset = NS_MAX(1.0, val);
} else {
aMetrics->subscriptOffset = aMetrics->xHeight;
}
aMetrics->maxHeight = aMetrics->maxAscent + aMetrics->maxDescent;
// Make the line height an integer number of pixels so that lines will be
// equally spaced (rather than just being snapped to pixels, some up and
// some down). Layout calculates line height from the emHeight +
// internalLeading + externalLeading, but first each of these is rounded
// to layout units. To ensure that the result is an integer number of
// pixels, round each of the components to pixels.
aMetrics->emHeight = NS_floor(emHeight + 0.5);
// maxHeight will normally be an integer, but round anyway in case
// FreeType is configured differently.
aMetrics->internalLeading =
NS_floor(aMetrics->maxHeight - aMetrics->emHeight + 0.5);
// Text input boxes currently don't work well with lineHeight
// significantly less than maxHeight (with Verdana, for example).
lineHeight = NS_floor(NS_MAX(lineHeight, aMetrics->maxHeight) + 0.5);
aMetrics->externalLeading =
lineHeight - aMetrics->internalLeading - aMetrics->emHeight;
// Ensure emAscent + emDescent == emHeight
gfxFloat sum = aMetrics->emAscent + aMetrics->emDescent;
aMetrics->emAscent = sum > 0.0 ?
aMetrics->emAscent * aMetrics->emHeight / sum : 0.0;
aMetrics->emDescent = aMetrics->emHeight - aMetrics->emAscent;
}
void PredefinedSymRenderer::compile()
{
if( unlikely(!this->renderBuffer_.empty()) ) {
CINAMO_EXCEPTION(Exception, "[BUG] Oops. PredefinedSymRenderer already compiled.");
}
int nowSprite = 0;
int const maxSize = drawableManager_->maxTextureSize();
this->renderBuffer_.resize(1);
Image* image = &renderBuffer_.back();
image->sprite = this->drawableManager_->queryRawSprite(ImageFormat::RGBA8, maxSize, maxSize);
int nowX = 0;
int nowY = 0;
for(std::pair<const Symbol, Entry>& p : entryTable_) {
Entry& ent = p.second;
if(ent.areaInSprite.width() + FLOAT_FROM_16_16(nowX) > image->sprite->width()) {
nowX = 0;
nowY += height_;
}
if( nowY + height_ > image->sprite->height()){
nowX = 0;
nowY = 0;
renderBuffer_.resize((++nowSprite)+1);
image = &renderBuffer_.back();
image->sprite = this->drawableManager_->queryRawSprite(ImageFormat::RGBA8, maxSize, maxSize);
}
ent.spriteNo = nowSprite;
ent.areaInSprite.x(FLOAT_FROM_16_16(nowX));
ent.areaInSprite.y(nowY);
Sprite::Session ss(image->sprite);
int const spriteAlign = ss.align();
int const spriteStride = ss.stride();
unsigned char* const spriteBuf = ss.data();
for( Handler<BitmapGlyph> const& glyph : ent.glyphs ) {
FT_BitmapGlyph g = glyph->get();
int const startX = INT_FROM_16_16_FLOOR(nowX)+g->left;
int const bmpPitch = g->bitmap.pitch;
int const bmpWidth = g->bitmap.width;
int const startY = ascent_-g->top;
int const endY = g->bitmap.rows+startY;
int bmpY = 0;
for(int y=startY;y<endY;++y,++bmpY) {
unsigned int* const sprBuf = reinterpret_cast<unsigned int*>(&spriteBuf[((nowY+y)*spriteStride)+(startX*spriteAlign)]);
unsigned char* const bmpBuf = &g->bitmap.buffer[bmpPitch*bmpY];
for(int x=0;x<bmpWidth; ++x) {
#if IS_BIG_ENDIAN
sprBuf[x] = bmpBuf[x] | 0xffffff00;
#else
sprBuf[x] = bmpBuf[x] << 24 | 0xffffff;
#endif
}
}
nowX += g->root.advance.x;
}
ent.glyphs.clear();
ent.glyphs.shrink_to_fit();
}
}
