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https://github.com/RGBCube/serenity
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LibTTF: Split up Font.h into smaller internal header files.
This commit is contained in:
Srimanta Barua
Andreas Kling
parent
1e1d2cdedf
commit
ec08e9e780
7 changed files with 553 additions and 426 deletions
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@ -24,7 +24,10 @@
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "Cmap.h"
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#include "Font.h"
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#include "Glyf.h"
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#include "Tables.h"
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#include <AK/LogStream.h>
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#include <AK/Utf8View.h>
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#include <AK/Utf32View.h>
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@ -59,37 +62,37 @@ u32 tag_from_str(const char *str)
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return be_u32((const u8*) str);
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}
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u16 Font::Head::units_per_em() const
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u16 Head::units_per_em() const
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{
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return be_u16(m_slice.offset_pointer((u32) Offsets::UnitsPerEM));
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}
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i16 Font::Head::xmin() const
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i16 Head::xmin() const
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{
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return be_i16(m_slice.offset_pointer((u32) Offsets::XMin));
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}
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i16 Font::Head::ymin() const
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i16 Head::ymin() const
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{
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return be_i16(m_slice.offset_pointer((u32) Offsets::YMin));
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}
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i16 Font::Head::xmax() const
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i16 Head::xmax() const
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{
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return be_i16(m_slice.offset_pointer((u32) Offsets::XMax));
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}
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i16 Font::Head::ymax() const
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i16 Head::ymax() const
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{
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return be_i16(m_slice.offset_pointer((u32) Offsets::YMax));
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}
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u16 Font::Head::lowest_recommended_ppem() const
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u16 Head::lowest_recommended_ppem() const
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{
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return be_u16(m_slice.offset_pointer((u32) Offsets::LowestRecPPEM));
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}
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Font::IndexToLocFormat Font::Head::index_to_loc_format() const
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IndexToLocFormat Head::index_to_loc_format() const
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{
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i16 raw = be_i16(m_slice.offset_pointer((u32) Offsets::IndexToLocFormat));
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switch (raw) {
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@ -102,32 +105,32 @@ Font::IndexToLocFormat Font::Head::index_to_loc_format() const
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}
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}
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i16 Font::Hhea::ascender() const
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i16 Hhea::ascender() const
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{
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return be_i16(m_slice.offset_pointer((u32) Offsets::Ascender));
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}
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i16 Font::Hhea::descender() const
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i16 Hhea::descender() const
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{
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return be_i16(m_slice.offset_pointer((u32) Offsets::Descender));
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}
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i16 Font::Hhea::line_gap() const
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i16 Hhea::line_gap() const
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{
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return be_i16(m_slice.offset_pointer((u32) Offsets::LineGap));
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}
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u16 Font::Hhea::advance_width_max() const
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u16 Hhea::advance_width_max() const
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{
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return be_u16(m_slice.offset_pointer((u32) Offsets::AdvanceWidthMax));
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}
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u16 Font::Hhea::number_of_h_metrics() const
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u16 Hhea::number_of_h_metrics() const
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{
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return be_u16(m_slice.offset_pointer((u32) Offsets::NumberOfHMetrics));
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}
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Font::GlyphHorizontalMetrics Font::Hmtx::get_glyph_horizontal_metrics(u32 glyph_id) const
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GlyphHorizontalMetrics Hmtx::get_glyph_horizontal_metrics(u32 glyph_id) const
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{
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ASSERT(glyph_id < m_num_glyphs);
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if (glyph_id < m_number_of_h_metrics) {
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@ -148,7 +151,7 @@ Font::GlyphHorizontalMetrics Font::Hmtx::get_glyph_horizontal_metrics(u32 glyph_
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};
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}
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u16 Font::Maxp::num_glyphs() const
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u16 Maxp::num_glyphs() const
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{
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return be_u16(m_slice.offset_pointer((u32) Offsets::NumGlyphs));
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}
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@ -244,13 +247,14 @@ Font::Font(ByteBuffer&& buffer, u32 offset)
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ASSERT(glyf_slice.has_value());
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// Load the tables.
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m_head = Head(head_slice.value());
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m_hhea = Hhea(hhea_slice.value());
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m_maxp = Maxp(maxp_slice.value());
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m_hmtx = Hmtx(hmtx_slice.value(), m_maxp.num_glyphs(), m_hhea.number_of_h_metrics());
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m_head_slice = head_slice.value();
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m_hhea_slice = hhea_slice.value();
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m_maxp_slice = maxp_slice.value();
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m_hmtx_slice = hmtx_slice.value();
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m_loca_slice = loca_slice.value();
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m_glyf_slice = glyf_slice.value();
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m_cmap = Cmap(cmap_slice.value());
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m_loca = Loca(loca_slice.value(), m_maxp.num_glyphs(), m_head.index_to_loc_format());
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m_glyf = Glyf(glyf_slice.value());
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// Select cmap table. FIXME: Do this better. Right now, just looks for platform "Windows"
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// and corresponding encoding "Unicode full repertoire", or failing that, "Unicode BMP"
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@ -275,10 +279,11 @@ Font::Font(ByteBuffer&& buffer, u32 offset)
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ScaledFontMetrics Font::metrics(float x_scale, float y_scale) const
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{
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auto ascender = m_hhea.ascender() * y_scale;
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auto descender = m_hhea.descender() * y_scale;
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auto line_gap = m_hhea.line_gap() * y_scale;
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auto advance_width_max = m_hhea.advance_width_max() * x_scale;
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Hhea hhea(m_hhea_slice);
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auto ascender = hhea.ascender() * y_scale;
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auto descender = hhea.descender() * y_scale;
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auto line_gap = hhea.line_gap() * y_scale;
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auto advance_width_max = hhea.advance_width_max() * x_scale;
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return ScaledFontMetrics {
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.ascender = (int) roundf(ascender),
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.descender = (int) roundf(descender),
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@ -287,14 +292,22 @@ ScaledFontMetrics Font::metrics(float x_scale, float y_scale) const
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};
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}
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// FIXME: "loca" and "glyf" are not available for CFF fonts.
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ScaledGlyphMetrics Font::glyph_metrics(u32 glyph_id, float x_scale, float y_scale) const
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{
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if (glyph_id >= m_maxp.num_glyphs()) {
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u32 num_glyphs = glyph_count();
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u16 number_of_h_metrics = Hhea(m_hhea_slice).number_of_h_metrics();
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auto index_to_loc_format = Head(m_head_slice).index_to_loc_format();
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Hmtx hmtx(m_hmtx_slice, num_glyphs, number_of_h_metrics);
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Loca loca(m_loca_slice, num_glyphs, index_to_loc_format);
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Glyf glyf(m_glyf_slice);
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if (glyph_id >= num_glyphs) {
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glyph_id = 0;
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}
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auto horizontal_metrics = m_hmtx.get_glyph_horizontal_metrics(glyph_id);
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auto glyph_offset = m_loca.get_glyph_offset(glyph_id);
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auto glyph = m_glyf.glyph(glyph_offset);
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auto horizontal_metrics = hmtx.get_glyph_horizontal_metrics(glyph_id);
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auto glyph_offset = loca.get_glyph_offset(glyph_id);
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auto glyph = glyf.glyph(glyph_offset);
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int ascender = glyph.ascender();
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int descender = glyph.descender();
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return ScaledGlyphMetrics {
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@ -308,20 +321,35 @@ ScaledGlyphMetrics Font::glyph_metrics(u32 glyph_id, float x_scale, float y_scal
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// FIXME: "loca" and "glyf" are not available for CFF fonts.
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RefPtr<Gfx::Bitmap> Font::raster_glyph(u32 glyph_id, float x_scale, float y_scale) const
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{
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if (glyph_id >= m_maxp.num_glyphs()) {
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u32 num_glyphs = glyph_count();
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auto index_to_loc_format = Head(m_head_slice).index_to_loc_format();
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Loca loca(m_loca_slice, num_glyphs, index_to_loc_format);
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Glyf glyf(m_glyf_slice);
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if (glyph_id >= num_glyphs) {
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glyph_id = 0;
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}
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auto glyph_offset = m_loca.get_glyph_offset(glyph_id);
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auto glyph = m_glyf.glyph(glyph_offset);
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auto glyph_offset = loca.get_glyph_offset(glyph_id);
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auto glyph = glyf.glyph(glyph_offset);
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return glyph.raster(x_scale, y_scale, [&](u16 glyph_id) {
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if (glyph_id >= m_maxp.num_glyphs()) {
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if (glyph_id >= num_glyphs) {
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glyph_id = 0;
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}
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auto glyph_offset = m_loca.get_glyph_offset(glyph_id);
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return m_glyf.glyph(glyph_offset);
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auto glyph_offset = loca.get_glyph_offset(glyph_id);
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return glyf.glyph(glyph_offset);
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});
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}
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u32 Font::glyph_count() const
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{
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return Maxp(m_maxp_slice).num_glyphs();
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}
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u16 Font::units_per_em() const
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{
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return Head(m_head_slice).units_per_em();
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}
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int ScaledFont::width(const StringView& string) const
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{
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Utf8View utf8 { string };
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