summaryrefslogtreecommitdiffstats
path: root/gfx/harfbuzz/src/hb-paint-extents.cc
diff options
context:
space:
mode:
Diffstat (limited to 'gfx/harfbuzz/src/hb-paint-extents.cc')
-rw-r--r--gfx/harfbuzz/src/hb-paint-extents.cc330
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