[paint-extents] Start out
This commit is contained in:
Behdad Esfahbod
parent
44b48845b7
commit
268d8b7ded
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@ -91,6 +91,7 @@ HB_BASE_sources = \
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hb-ot-layout-gpos-table.hh \
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hb-paint.cc \
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hb-paint.hh \
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hb-paint-extents.hh \
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hb-ot-layout-gsub-table.hh \
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OT/glyf/glyf.hh \
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OT/glyf/glyf-helpers.hh \
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@ -27,6 +27,8 @@
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#include "hb.hh"
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#include "hb-paint-extents.hh"
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#include FT_COLOR_H
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#ifndef HB_NO_PAINT
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@ -0,0 +1,288 @@
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/*
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* Copyright © 2022 Behdad Esfahbod
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*/
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#ifndef HB_PAINT_EXTENTS_HH
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#define HB_PAINT_EXTENTS_HH
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#include "hb.hh"
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#include "hb-paint.hh"
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typedef struct hb_transform_t
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{
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hb_transform_t () {}
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hb_transform_t (float xx, float yx,
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float xy, float yy,
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float x0, float y0) :
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xx (xx), yx (yx), xy (xy), yy (yy), x0 (x0), y0 (y0) {}
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void multiply (const hb_transform_t &o)
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{
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/* Copied from cairo, with "o" being "a" there and "this" being "b" there. */
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hb_transform_t r;
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r.xx = o.xx * xx + o.yx * xy;
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r.yx = o.xx * yx + o.yx * yy;
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r.xy = o.xy * xx + o.yy * xy;
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r.yy = o.xy * yx + o.yy * yy;
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r.x0 = o.x0 * xx + o.y0 * xy + x0;
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r.y0 = o.x0 * yx + o.y0 * yy + y0;
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*this = r;
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}
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float xx = 1.f;
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float yx = 0.f;
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float xy = 0.f;
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float yy = 1.f;
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float x0 = 0.f;
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float y0 = 0.f;
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} hb_transform_t;
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typedef struct hb_bounds_t
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{
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hb_bounds_t () {}
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hb_bounds_t (const hb_glyph_extents_t &extents) :
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bounded (true), extents (extents) {}
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bool bounded = false;
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hb_glyph_extents_t extents = {0, 0, 0, 0};
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} hb_bounds_t;
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typedef struct hb_paint_extents_context_t hb_paint_extents_context_t;
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struct hb_paint_extents_context_t {
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hb_paint_extents_context_t ()
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{
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clips.push (hb_bounds_t{});
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bounds.push (hb_bounds_t{});
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transforms.push (hb_transform_t{});
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}
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void push_transform (const hb_transform_t &trans)
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{
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hb_transform_t r = transforms.tail ();
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r.multiply (trans);
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transforms.push (r);
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}
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void pop_transform ()
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{
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transforms.pop ();
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}
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void push_clip (const hb_glyph_extents_t &extents)
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{
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hb_bounds_t b {extents};
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clips.push (b);
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}
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void pop_clip ()
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{
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clips.pop ();
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}
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void push_group ()
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{
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bounds.push (hb_bounds_t{});
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}
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hb_bounds_t pop_group ()
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{
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return bounds.pop ();
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}
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void add_extents (const hb_glyph_extents_t &extents)
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{
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// TODO
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//hb_transform_t &r = transforms.tail ();
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}
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hb_vector_t<hb_bounds_t> clips;
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hb_vector_t<hb_bounds_t> bounds;
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hb_vector_t<hb_transform_t> transforms;
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};
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static void
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hb_paint_extents_push_transform (hb_paint_funcs_t *funcs HB_UNUSED,
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void *paint_data,
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float xx, float yx,
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float xy, float yy,
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float dx, float dy,
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void *user_data HB_UNUSED)
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{
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hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
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c->push_transform (hb_transform_t {xx, yx, xy, yy, dx, dy});
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}
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static void
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hb_paint_extents_pop_transform (hb_paint_funcs_t *funcs HB_UNUSED,
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void *paint_data,
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void *user_data HB_UNUSED)
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{
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hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
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c->pop_transform ();
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}
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static void
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hb_paint_extents_push_clip_glyph (hb_paint_funcs_t *funcs HB_UNUSED,
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void *paint_data,
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hb_codepoint_t glyph,
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hb_font_t *font,
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void *user_data HB_UNUSED)
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{
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//hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
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// TODO
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}
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static void
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hb_paint_extents_push_clip_rectangle (hb_paint_funcs_t *funcs HB_UNUSED,
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void *paint_data,
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float xmin, float ymin, float xmax, float ymax,
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void *user_data)
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{
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// TODO
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}
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static void
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hb_paint_extents_pop_clip (hb_paint_funcs_t *funcs HB_UNUSED,
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void *paint_data,
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void *user_data HB_UNUSED)
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{
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hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
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c->pop_clip ();
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}
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static void
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hb_paint_extents_push_group (hb_paint_funcs_t *funcs HB_UNUSED,
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void *paint_data,
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void *user_data HB_UNUSED)
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{
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hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
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c->push_group ();
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}
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static void
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hb_paint_extents_pop_group (hb_paint_funcs_t *funcs HB_UNUSED,
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void *paint_data,
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hb_paint_composite_mode_t mode,
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void *user_data HB_UNUSED)
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{
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hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
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hb_bounds_t bounds = c->pop_group ();
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// TODO
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}
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static void
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hb_paint_extents_paint_image (hb_paint_funcs_t *funcs HB_UNUSED,
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void *paint_data,
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hb_blob_t *blob HB_UNUSED,
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unsigned int width HB_UNUSED,
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unsigned int height HB_UNUSED,
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hb_tag_t format HB_UNUSED,
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float slant HB_UNUSED,
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hb_glyph_extents_t *extents,
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void *user_data HB_UNUSED)
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{
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// TODO
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}
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static void
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hb_paint_extents_paint_color (hb_paint_funcs_t *funcs HB_UNUSED,
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void *paint_data,
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hb_bool_t use_foreground HB_UNUSED,
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hb_color_t color HB_UNUSED,
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void *user_data HB_UNUSED)
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{
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// TODO
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}
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static void
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hb_paint_extents_paint_linear_gradient (hb_paint_funcs_t *funcs HB_UNUSED,
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void *paint_data,
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hb_color_line_t *color_line HB_UNUSED,
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float x0 HB_UNUSED, float y0 HB_UNUSED,
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float x1 HB_UNUSED, float y1 HB_UNUSED,
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float x2 HB_UNUSED, float y2 HB_UNUSED,
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void *user_data HB_UNUSED)
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{
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// TODO
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}
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static void
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hb_paint_extents_paint_radial_gradient (hb_paint_funcs_t *funcs HB_UNUSED,
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void *paint_data,
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hb_color_line_t *color_line HB_UNUSED,
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float x0 HB_UNUSED, float y0 HB_UNUSED, float r0 HB_UNUSED,
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float x1 HB_UNUSED, float y1 HB_UNUSED, float r1 HB_UNUSED,
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void *user_data HB_UNUSED)
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{
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// TODO
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}
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static void
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hb_paint_extents_paint_sweep_gradient (hb_paint_funcs_t *funcs HB_UNUSED,
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void *paint_data,
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hb_color_line_t *color_line HB_UNUSED,
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float cx HB_UNUSED, float cy HB_UNUSED,
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float start_angle HB_UNUSED,
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float end_angle HB_UNUSED,
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void *user_data HB_UNUSED)
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{
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// TODO
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}
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static inline hb_paint_funcs_t *
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hb_paint_extents_get_funcs ()
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{
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hb_paint_funcs_t *funcs = hb_paint_funcs_create ();
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hb_paint_funcs_set_push_transform_func (funcs, hb_paint_extents_push_transform, nullptr, nullptr);
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hb_paint_funcs_set_pop_transform_func (funcs, hb_paint_extents_pop_transform, nullptr, nullptr);
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hb_paint_funcs_set_push_clip_glyph_func (funcs, hb_paint_extents_push_clip_glyph, nullptr, nullptr);
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hb_paint_funcs_set_push_clip_rectangle_func (funcs, hb_paint_extents_push_clip_rectangle, nullptr, nullptr);
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hb_paint_funcs_set_pop_clip_func (funcs, hb_paint_extents_pop_clip, nullptr, nullptr);
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hb_paint_funcs_set_push_group_func (funcs, hb_paint_extents_push_group, nullptr, nullptr);
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hb_paint_funcs_set_pop_group_func (funcs, hb_paint_extents_pop_group, nullptr, nullptr);
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hb_paint_funcs_set_color_func (funcs, hb_paint_extents_paint_color, nullptr, nullptr);
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hb_paint_funcs_set_image_func (funcs, hb_paint_extents_paint_image, nullptr, nullptr);
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hb_paint_funcs_set_linear_gradient_func (funcs, hb_paint_extents_paint_linear_gradient, nullptr, nullptr);
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hb_paint_funcs_set_radial_gradient_func (funcs, hb_paint_extents_paint_radial_gradient, nullptr, nullptr);
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hb_paint_funcs_set_sweep_gradient_func (funcs, hb_paint_extents_paint_sweep_gradient, nullptr, nullptr);
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return funcs;
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}
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#endif /* HB_PAINT_EXTENTS_HH */
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@ -46,6 +46,7 @@ hb_base_sources = files(
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'hb-draw.hh',
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'hb-paint.cc',
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'hb-paint.hh',
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'hb-paint-extents.hh',
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'hb-face.cc',
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'hb-face.hh',
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'hb-fallback-shape.cc',
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