147 lines
4.5 KiB
C++
147 lines
4.5 KiB
C++
#pragma once
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#include "agg_basics.h"
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#include "agg_conv_curve.h"
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#include "agg_conv_transform.h"
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#include "agg_gamma_lut.h"
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#include "agg_font_freetype.h"
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#include "agg_pixfmt_alpha8.h"
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#include "agg_rasterizer_scanline_aa.h"
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#include "agg_renderer_primitives.h"
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#include "agg_renderer_scanline.h"
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#include "agg_rendering_buffer.h"
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#include "agg_scanline_u.h"
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class font_renderer_alpha
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{
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typedef agg::pixfmt_alpha8 pixfmt_type;
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typedef agg::renderer_base<pixfmt_type> base_ren_type;
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typedef agg::renderer_scanline_aa_solid<base_ren_type> renderer_solid;
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typedef agg::font_engine_freetype_int32 font_engine_type;
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typedef agg::font_cache_manager<font_engine_type> font_manager_type;
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font_engine_type m_feng;
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font_manager_type m_fman;
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// Font rendering options.
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bool m_hinting;
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bool m_kerning;
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bool m_font_loaded;
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// Pipeline to process the vectors glyph paths (curves + contour)
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agg::trans_affine m_mtx;
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agg::conv_curve<font_manager_type::path_adaptor_type> m_curves;
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agg::conv_transform<agg::conv_curve<font_manager_type::path_adaptor_type> > m_trans;
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public:
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typedef agg::pixfmt_alpha8::color_type color_type;
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font_renderer_alpha(bool hinting, bool kerning):
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m_feng(),
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m_fman(m_feng),
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m_hinting(hinting),
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m_kerning(kerning),
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m_font_loaded(false),
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m_curves(m_fman.path_adaptor()),
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m_trans(m_curves, m_mtx)
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{ }
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int get_face_height() const {
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return m_feng.face_height();
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}
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bool get_font_vmetrics(double& ascender, double& descender) {
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int face_height = m_feng.face_height();
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if (face_height > 0) {
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double current_height = m_feng.height();
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m_feng.height(1.0);
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ascender = m_feng.ascender();
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descender = m_feng.descender();
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m_feng.height(current_height);
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return true;
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}
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return false;
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}
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float scale_for_em_to_pixels(float size) {
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int units_per_em = m_feng.face_units_em();
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if (units_per_em > 0) {
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return size / units_per_em;
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}
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return 0.0;
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}
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bool load_font(const char *font_filename) {
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if(m_feng.load_font(font_filename, 0, agg::glyph_ren_outline)) {
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m_font_loaded = true;
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}
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return m_font_loaded;
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}
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template<class Rasterizer, class Scanline, class RenSolid>
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void draw_codepoint(Rasterizer& ras, Scanline& sl,
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RenSolid& ren_solid, const color_type color,
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int codepoint, double& x, double& y, double height, int subpixel_scale)
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{
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const double scale_x = 100;
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m_feng.height(height);
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m_feng.width(height * scale_x * subpixel_scale);
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m_feng.hinting(m_hinting);
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// Represent the delta in x scaled by scale_x.
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double x_delta = 0;
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double start_x = x;
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const agg::glyph_cache* glyph = m_fman.glyph(codepoint);
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if(glyph)
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{
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if(m_kerning)
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{
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m_fman.add_kerning(&x_delta, &y);
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}
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m_fman.init_embedded_adaptors(glyph, 0, 0);
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if(glyph->data_type == agg::glyph_data_outline)
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{
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double ty = m_hinting ? floor(y + 0.5) : y;
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ras.reset();
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m_mtx.reset();
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m_mtx *= agg::trans_affine_scaling(1.0 / scale_x, 1);
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m_mtx *= agg::trans_affine_translation(start_x + x_delta / scale_x, ty);
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ras.add_path(m_trans);
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ren_solid.color(color);
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agg::render_scanlines(ras, sl, ren_solid);
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}
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y += glyph->advance_y;
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x += (x_delta + glyph->advance_x) / scale_x;
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}
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}
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void clear(agg::rendering_buffer& ren_buf, const color_type color) {
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pixfmt_type pf(ren_buf);
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base_ren_type ren_base(pf);
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ren_base.clear(color);
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}
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void render_codepoint(agg::rendering_buffer& ren_buf,
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const double text_size,
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const color_type text_color,
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double& x, double& y,
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int codepoint, int subpixel_scale)
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{
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if (!m_font_loaded) {
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return;
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}
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agg::scanline_u8 sl;
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agg::rasterizer_scanline_aa<> ras;
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ras.clip_box(0, 0, ren_buf.width(), ren_buf.height());
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agg::pixfmt_alpha8 pf(ren_buf);
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base_ren_type ren_base(pf);
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renderer_solid ren_solid(ren_base);
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draw_codepoint(ras, sl, ren_solid, text_color, codepoint, x, y, text_size, subpixel_scale);
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}
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};
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