2017-01-09 22:49:00 -05:00
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// Copyright 2017 The Servo Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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2017-01-10 16:37:01 -05:00
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use compute_shader::buffer::{Buffer, BufferData, HostAllocatedData, Protection};
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use compute_shader::device::Device;
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use euclid::{Point2D, Rect, Size2D};
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use otf::glyf::GlyfTable;
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use otf::head::HeadTable;
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use otf::loca::LocaTable;
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pub struct GlyphBufferBuilder {
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pub coordinates: Vec<(i16, i16)>,
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pub operations: Vec<u8>,
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pub descriptors: Vec<GlyphDescriptor>,
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}
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2017-01-10 16:37:01 -05:00
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impl GlyphBufferBuilder {
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#[inline]
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pub fn new() -> GlyphBufferBuilder {
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GlyphBufferBuilder {
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coordinates: vec![],
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operations: vec![],
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descriptors: vec![],
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}
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}
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pub fn add_glyph(&mut self,
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glyph_id: u32,
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head_table: &HeadTable,
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loca_table: &LocaTable,
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glyf_table: &GlyfTable)
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-> Result<(), ()> {
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let mut point_index = self.coordinates.len() / 2;
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let start_point = point_index;
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let mut operations = if point_index % 4 == 0 {
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0
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} else {
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self.operations.pop().unwrap()
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};
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try!(glyf_table.for_each_point(loca_table, glyph_id, |point| {
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self.coordinates.push((point.position.x, point.position.y));
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let operation = if point.first_point_in_contour {
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0
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} else if point.on_curve {
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1
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} else {
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2
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};
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operations |= operation << (point_index % 4 * 2);
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point_index += 1;
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if point_index % 4 == 0 {
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self.operations.push(operation)
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}
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}));
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if point_index % 4 != 0 {
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self.operations.push(operations)
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}
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// TODO(pcwalton): Add a glyph descriptor.
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let bounding_rect = try!(glyf_table.bounding_rect(loca_table, glyph_id));
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self.descriptors.push(GlyphDescriptor {
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left: bounding_rect.origin.x,
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bottom: bounding_rect.origin.y,
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width: bounding_rect.size.width,
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height: bounding_rect.size.height,
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units_per_em: head_table.units_per_em,
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point_count: (point_index - start_point) as u16,
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start_point: start_point as u32,
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});
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Ok(())
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}
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pub fn finish(&self, device: &Device) -> Result<GlyphBuffers, ()> {
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let coordinates = BufferData::HostAllocated(HostAllocatedData::new(&self.coordinates));
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let operations = BufferData::HostAllocated(HostAllocatedData::new(&self.operations));
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let descriptors = BufferData::HostAllocated(HostAllocatedData::new(&self.descriptors));
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Ok(GlyphBuffers {
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coordinates: try!(device.create_buffer(Protection::ReadOnly, coordinates)
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.map_err(drop)),
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operations: try!(device.create_buffer(Protection::ReadOnly, operations).map_err(drop)),
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descriptors: try!(device.create_buffer(Protection::ReadOnly, descriptors)
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.map_err(drop)),
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})
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}
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}
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pub struct GlyphBuffers {
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pub coordinates: Buffer,
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pub operations: Buffer,
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pub descriptors: Buffer,
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}
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#[repr(C)]
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pub struct GlyphDescriptor {
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pub left: i16,
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pub bottom: i16,
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pub width: i16,
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pub height: i16,
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pub units_per_em: u16,
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pub point_count: u16,
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pub start_point: u32,
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}
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impl GlyphDescriptor {
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#[inline]
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pub fn pixel_rect(&self, point_size: f32) -> Rect<f32> {
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let pixels_per_unit = point_size / self.units_per_em as f32;
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Rect::new(Point2D::new(self.left as f32, self.bottom as f32),
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Size2D::new(self.width as f32, self.height as f32)) * pixels_per_unit
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}
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}
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