diff options
Diffstat (limited to 'gfx/harfbuzz/src/hb-paint-extents.cc')
| -rw-r--r-- | gfx/harfbuzz/src/hb-paint-extents.cc | 330 |
1 files changed, 330 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-paint-extents.cc b/gfx/harfbuzz/src/hb-paint-extents.cc new file mode 100644 index 0000000000..2393322b71 --- /dev/null +++ b/gfx/harfbuzz/src/hb-paint-extents.cc @@ -0,0 +1,330 @@ +/* + * Copyright © 2022 Behdad Esfahbod + * + * This is part of HarfBuzz, a text shaping library. + * + * Permission is hereby granted, without written agreement and without + * license or royalty fees, to use, copy, modify, and distribute this + * software and its documentation for any purpose, provided that the + * above copyright notice and the following two paragraphs appear in + * all copies of this software. + * + * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR + * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES + * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN + * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH + * DAMAGE. + * + * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, + * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS + * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO + * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. + */ + +#include "hb.hh" + +#ifndef HB_NO_PAINT + +#include "hb-paint-extents.hh" + +#include "hb-draw.h" + +#include "hb-machinery.hh" + + +/* + * This file implements bounds-extraction as well as boundedness + * computation of COLRv1 fonts as described in: + * + * https://learn.microsoft.com/en-us/typography/opentype/spec/colr#glyph-metrics-and-boundedness + */ + +static void +hb_paint_extents_push_transform (hb_paint_funcs_t *funcs HB_UNUSED, + void *paint_data, + float xx, float yx, + float xy, float yy, + float dx, float dy, + void *user_data HB_UNUSED) +{ + hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data; + + c->push_transform (hb_transform_t {xx, yx, xy, yy, dx, dy}); +} + +static void +hb_paint_extents_pop_transform (hb_paint_funcs_t *funcs HB_UNUSED, + void *paint_data, + void *user_data HB_UNUSED) +{ + hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data; + + c->pop_transform (); +} + +static void +hb_draw_extents_move_to (hb_draw_funcs_t *dfuncs HB_UNUSED, + void *data, + hb_draw_state_t *st, + float to_x, float to_y, + void *user_data HB_UNUSED) +{ + hb_extents_t *extents = (hb_extents_t *) data; + + extents->add_point (to_x, to_y); +} + +static void +hb_draw_extents_line_to (hb_draw_funcs_t *dfuncs HB_UNUSED, + void *data, + hb_draw_state_t *st, + float to_x, float to_y, + void *user_data HB_UNUSED) +{ + hb_extents_t *extents = (hb_extents_t *) data; + + extents->add_point (to_x, to_y); +} + +static void +hb_draw_extents_quadratic_to (hb_draw_funcs_t *dfuncs HB_UNUSED, + void *data, + hb_draw_state_t *st, + float control_x, float control_y, + float to_x, float to_y, + void *user_data HB_UNUSED) +{ + hb_extents_t *extents = (hb_extents_t *) data; + + extents->add_point (control_x, control_y); + extents->add_point (to_x, to_y); +} + +static void +hb_draw_extents_cubic_to (hb_draw_funcs_t *dfuncs HB_UNUSED, + void *data, + hb_draw_state_t *st, + float control1_x, float control1_y, + float control2_x, float control2_y, + float to_x, float to_y, + void *user_data HB_UNUSED) +{ + hb_extents_t *extents = (hb_extents_t *) data; + + extents->add_point (control1_x, control1_y); + extents->add_point (control2_x, control2_y); + extents->add_point (to_x, to_y); +} + +static inline void free_static_draw_extents_funcs (); + +static struct hb_draw_extents_funcs_lazy_loader_t : hb_draw_funcs_lazy_loader_t<hb_draw_extents_funcs_lazy_loader_t> +{ + static hb_draw_funcs_t *create () + { + hb_draw_funcs_t *funcs = hb_draw_funcs_create (); + + hb_draw_funcs_set_move_to_func (funcs, hb_draw_extents_move_to, nullptr, nullptr); + hb_draw_funcs_set_line_to_func (funcs, hb_draw_extents_line_to, nullptr, nullptr); + hb_draw_funcs_set_quadratic_to_func (funcs, hb_draw_extents_quadratic_to, nullptr, nullptr); + hb_draw_funcs_set_cubic_to_func (funcs, hb_draw_extents_cubic_to, nullptr, nullptr); + + hb_draw_funcs_make_immutable (funcs); + + hb_atexit (free_static_draw_extents_funcs); + + return funcs; + } +} static_draw_extents_funcs; + +static inline +void free_static_draw_extents_funcs () +{ + static_draw_extents_funcs.free_instance (); +} + +static hb_draw_funcs_t * +hb_draw_extents_get_funcs () +{ + return static_draw_extents_funcs.get_unconst (); +} + +static void +hb_paint_extents_push_clip_glyph (hb_paint_funcs_t *funcs HB_UNUSED, + void *paint_data, + hb_codepoint_t glyph, + hb_font_t *font, + void *user_data HB_UNUSED) +{ + hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data; + + hb_extents_t extents; + hb_draw_funcs_t *draw_extent_funcs = hb_draw_extents_get_funcs (); + hb_font_draw_glyph (font, glyph, draw_extent_funcs, &extents); + c->push_clip (extents); +} + +static void +hb_paint_extents_push_clip_rectangle (hb_paint_funcs_t *funcs HB_UNUSED, + void *paint_data, + float xmin, float ymin, float xmax, float ymax, + void *user_data) +{ + hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data; + + hb_extents_t extents = {xmin, ymin, xmax, ymax}; + c->push_clip (extents); +} + +static void +hb_paint_extents_pop_clip (hb_paint_funcs_t *funcs HB_UNUSED, + void *paint_data, + void *user_data HB_UNUSED) +{ + hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data; + + c->pop_clip (); +} + +static void +hb_paint_extents_push_group (hb_paint_funcs_t *funcs HB_UNUSED, + void *paint_data, + void *user_data HB_UNUSED) +{ + hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data; + + c->push_group (); +} + +static void +hb_paint_extents_pop_group (hb_paint_funcs_t *funcs HB_UNUSED, + void *paint_data, + hb_paint_composite_mode_t mode, + void *user_data HB_UNUSED) +{ + hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data; + + c->pop_group (mode); +} + +static hb_bool_t +hb_paint_extents_paint_image (hb_paint_funcs_t *funcs HB_UNUSED, + void *paint_data, + hb_blob_t *blob HB_UNUSED, + unsigned int width HB_UNUSED, + unsigned int height HB_UNUSED, + hb_tag_t format HB_UNUSED, + float slant HB_UNUSED, + hb_glyph_extents_t *glyph_extents, + void *user_data HB_UNUSED) +{ + hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data; + + hb_extents_t extents = {(float) glyph_extents->x_bearing, + (float) glyph_extents->y_bearing + glyph_extents->height, + (float) glyph_extents->x_bearing + glyph_extents->width, + (float) glyph_extents->y_bearing}; + c->push_clip (extents); + c->paint (); + c->pop_clip (); + + return true; +} + +static void +hb_paint_extents_paint_color (hb_paint_funcs_t *funcs HB_UNUSED, + void *paint_data, + hb_bool_t use_foreground HB_UNUSED, + hb_color_t color HB_UNUSED, + void *user_data HB_UNUSED) +{ + hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data; + + c->paint (); +} + +static void +hb_paint_extents_paint_linear_gradient (hb_paint_funcs_t *funcs HB_UNUSED, + void *paint_data, + hb_color_line_t *color_line HB_UNUSED, + float x0 HB_UNUSED, float y0 HB_UNUSED, + float x1 HB_UNUSED, float y1 HB_UNUSED, + float x2 HB_UNUSED, float y2 HB_UNUSED, + void *user_data HB_UNUSED) +{ + hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data; + + c->paint (); +} + +static void +hb_paint_extents_paint_radial_gradient (hb_paint_funcs_t *funcs HB_UNUSED, + void *paint_data, + hb_color_line_t *color_line HB_UNUSED, + float x0 HB_UNUSED, float y0 HB_UNUSED, float r0 HB_UNUSED, + float x1 HB_UNUSED, float y1 HB_UNUSED, float r1 HB_UNUSED, + void *user_data HB_UNUSED) +{ + hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data; + + c->paint (); +} + +static void +hb_paint_extents_paint_sweep_gradient (hb_paint_funcs_t *funcs HB_UNUSED, + void *paint_data, + hb_color_line_t *color_line HB_UNUSED, + float cx HB_UNUSED, float cy HB_UNUSED, + float start_angle HB_UNUSED, + float end_angle HB_UNUSED, + void *user_data HB_UNUSED) +{ + hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data; + + c->paint (); +} + +static inline void free_static_paint_extents_funcs (); + +static struct hb_paint_extents_funcs_lazy_loader_t : hb_paint_funcs_lazy_loader_t<hb_paint_extents_funcs_lazy_loader_t> +{ + static hb_paint_funcs_t *create () + { + hb_paint_funcs_t *funcs = hb_paint_funcs_create (); + + hb_paint_funcs_set_push_transform_func (funcs, hb_paint_extents_push_transform, nullptr, nullptr); + hb_paint_funcs_set_pop_transform_func (funcs, hb_paint_extents_pop_transform, nullptr, nullptr); + hb_paint_funcs_set_push_clip_glyph_func (funcs, hb_paint_extents_push_clip_glyph, nullptr, nullptr); + hb_paint_funcs_set_push_clip_rectangle_func (funcs, hb_paint_extents_push_clip_rectangle, nullptr, nullptr); + hb_paint_funcs_set_pop_clip_func (funcs, hb_paint_extents_pop_clip, nullptr, nullptr); + hb_paint_funcs_set_push_group_func (funcs, hb_paint_extents_push_group, nullptr, nullptr); + hb_paint_funcs_set_pop_group_func (funcs, hb_paint_extents_pop_group, nullptr, nullptr); + hb_paint_funcs_set_color_func (funcs, hb_paint_extents_paint_color, nullptr, nullptr); + hb_paint_funcs_set_image_func (funcs, hb_paint_extents_paint_image, nullptr, nullptr); + hb_paint_funcs_set_linear_gradient_func (funcs, hb_paint_extents_paint_linear_gradient, nullptr, nullptr); + hb_paint_funcs_set_radial_gradient_func (funcs, hb_paint_extents_paint_radial_gradient, nullptr, nullptr); + hb_paint_funcs_set_sweep_gradient_func (funcs, hb_paint_extents_paint_sweep_gradient, nullptr, nullptr); + + hb_paint_funcs_make_immutable (funcs); + + hb_atexit (free_static_paint_extents_funcs); + + return funcs; + } +} static_paint_extents_funcs; + +static inline +void free_static_paint_extents_funcs () +{ + static_paint_extents_funcs.free_instance (); +} + +hb_paint_funcs_t * +hb_paint_extents_get_funcs () +{ + return static_paint_extents_funcs.get_unconst (); +} + + +#endif |