704 lines
21 KiB
C++
704 lines
21 KiB
C++
/*
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* Copyright © 2022 Matthias Clasen
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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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#include "hb.hh"
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#ifndef HB_NO_PAINT
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#include "hb-paint.hh"
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/**
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* SECTION: hb-paint
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* @title: hb-paint
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* @short_description: Glyph painting
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* @include: hb.h
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*
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* Functions for painting glyphs.
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*
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* The main purpose of these functions is to paint (extract) color glyph layers
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* from the COLRv1 table, but the API works for drawing ordinary outlines and
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* images as well.
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*
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* The #hb_paint_funcs_t struct can be used with hb_font_paint_glyph().
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**/
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static void
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hb_paint_push_transform_nil (hb_paint_funcs_t *funcs, 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) {}
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static void
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hb_paint_pop_transform_nil (hb_paint_funcs_t *funcs, void *paint_data,
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void *user_data) {}
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static void
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hb_paint_push_clip_glyph_nil (hb_paint_funcs_t *funcs, 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) {}
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static void
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hb_paint_push_clip_rectangle_nil (hb_paint_funcs_t *funcs, 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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static void
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hb_paint_pop_clip_nil (hb_paint_funcs_t *funcs, void *paint_data,
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void *user_data) {}
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static void
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hb_paint_color_nil (hb_paint_funcs_t *funcs, void *paint_data,
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hb_bool_t is_foreground,
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hb_color_t color,
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void *user_data) {}
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static hb_bool_t
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hb_paint_image_nil (hb_paint_funcs_t *funcs, void *paint_data,
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hb_blob_t *image,
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unsigned int width,
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unsigned int height,
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hb_tag_t format,
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float slant_xy,
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hb_glyph_extents_t *extents,
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void *user_data) { return false; }
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static void
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hb_paint_linear_gradient_nil (hb_paint_funcs_t *funcs, void *paint_data,
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hb_color_line_t *color_line,
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float x0, float y0,
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float x1, float y1,
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float x2, float y2,
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void *user_data) {}
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static void
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hb_paint_radial_gradient_nil (hb_paint_funcs_t *funcs, void *paint_data,
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hb_color_line_t *color_line,
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float x0, float y0, float r0,
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float x1, float y1, float r1,
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void *user_data) {}
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static void
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hb_paint_sweep_gradient_nil (hb_paint_funcs_t *funcs, void *paint_data,
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hb_color_line_t *color_line,
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float x0, float y0,
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float start_angle,
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float end_angle,
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void *user_data) {}
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static void
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hb_paint_push_group_nil (hb_paint_funcs_t *funcs, void *paint_data,
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void *user_data) {}
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static void
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hb_paint_pop_group_nil (hb_paint_funcs_t *funcs, void *paint_data,
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hb_paint_composite_mode_t mode,
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void *user_data) {}
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static hb_bool_t
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hb_paint_custom_palette_color_nil (hb_paint_funcs_t *funcs, void *paint_data,
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unsigned int color_index,
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hb_color_t *color,
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void *user_data) { return false; }
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static bool
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_hb_paint_funcs_set_preamble (hb_paint_funcs_t *funcs,
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bool func_is_null,
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void **user_data,
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hb_destroy_func_t *destroy)
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{
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if (hb_object_is_immutable (funcs))
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{
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if (*destroy)
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(*destroy) (*user_data);
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return false;
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}
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if (func_is_null)
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{
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if (*destroy)
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(*destroy) (*user_data);
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*destroy = nullptr;
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*user_data = nullptr;
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}
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return true;
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}
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static bool
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_hb_paint_funcs_set_middle (hb_paint_funcs_t *funcs,
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void *user_data,
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hb_destroy_func_t destroy)
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{
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if (user_data && !funcs->user_data)
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{
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funcs->user_data = (decltype (funcs->user_data)) hb_calloc (1, sizeof (*funcs->user_data));
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if (unlikely (!funcs->user_data))
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goto fail;
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}
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if (destroy && !funcs->destroy)
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{
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funcs->destroy = (decltype (funcs->destroy)) hb_calloc (1, sizeof (*funcs->destroy));
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if (unlikely (!funcs->destroy))
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goto fail;
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}
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return true;
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fail:
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if (destroy)
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(destroy) (user_data);
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return false;
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}
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#define HB_PAINT_FUNC_IMPLEMENT(name) \
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\
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void \
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hb_paint_funcs_set_##name##_func (hb_paint_funcs_t *funcs, \
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hb_paint_##name##_func_t func, \
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void *user_data, \
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hb_destroy_func_t destroy) \
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{ \
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if (!_hb_paint_funcs_set_preamble (funcs, !func, &user_data, &destroy)) \
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return; \
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\
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if (funcs->destroy && funcs->destroy->name) \
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funcs->destroy->name (!funcs->user_data ? nullptr : funcs->user_data->name);\
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\
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if (!_hb_paint_funcs_set_middle (funcs, user_data, destroy)) \
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return; \
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\
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if (func) \
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funcs->func.name = func; \
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else \
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funcs->func.name = hb_paint_##name##_nil; \
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\
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if (funcs->user_data) \
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funcs->user_data->name = user_data; \
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if (funcs->destroy) \
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funcs->destroy->name = destroy; \
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}
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HB_PAINT_FUNCS_IMPLEMENT_CALLBACKS
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#undef HB_PAINT_FUNC_IMPLEMENT
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/**
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* hb_paint_funcs_create:
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*
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* Creates a new #hb_paint_funcs_t structure of paint functions.
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*
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* The initial reference count of 1 should be released with hb_paint_funcs_destroy()
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* when you are done using the #hb_paint_funcs_t. This function never returns
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* `NULL`. If memory cannot be allocated, a special singleton #hb_paint_funcs_t
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* object will be returned.
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*
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* Returns value: (transfer full): the paint-functions structure
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*
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* XSince: REPLACEME
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*/
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hb_paint_funcs_t *
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hb_paint_funcs_create ()
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{
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hb_paint_funcs_t *funcs;
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if (unlikely (!(funcs = hb_object_create<hb_paint_funcs_t> ())))
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return const_cast<hb_paint_funcs_t *> (&Null (hb_paint_funcs_t));
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funcs->func = Null (hb_paint_funcs_t).func;
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return funcs;
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}
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DEFINE_NULL_INSTANCE (hb_paint_funcs_t) =
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{
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HB_OBJECT_HEADER_STATIC,
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{
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#define HB_PAINT_FUNC_IMPLEMENT(name) hb_paint_##name##_nil,
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HB_PAINT_FUNCS_IMPLEMENT_CALLBACKS
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#undef HB_PAINT_FUNC_IMPLEMENT
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}
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};
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/**
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* hb_paint_funcs_get_empty:
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*
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* Fetches the singleton empty paint-functions structure.
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*
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* Return value: (transfer full): The empty paint-functions structure
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*
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* XSince: REPLACEME
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**/
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hb_paint_funcs_t *
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hb_paint_funcs_get_empty ()
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{
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return const_cast<hb_paint_funcs_t *> (&Null (hb_paint_funcs_t));
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}
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/**
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* hb_paint_funcs_reference: (skip)
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* @funcs: The paint-functions structure
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*
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* Increases the reference count on a paint-functions structure.
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*
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* This prevents @funcs from being destroyed until a matching
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* call to hb_paint_funcs_destroy() is made.
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*
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* Return value: The paint-functions structure
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*
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* XSince: REPLACEME
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*/
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hb_paint_funcs_t *
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hb_paint_funcs_reference (hb_paint_funcs_t *funcs)
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{
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return hb_object_reference (funcs);
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}
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/**
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* hb_paint_funcs_destroy: (skip)
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* @funcs: The paint-functions structure
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*
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* Decreases the reference count on a paint-functions structure.
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*
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* When the reference count reaches zero, the structure
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* is destroyed, freeing all memory.
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*
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* XSince: REPLACEME
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*/
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void
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hb_paint_funcs_destroy (hb_paint_funcs_t *funcs)
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{
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if (!hb_object_destroy (funcs)) return;
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if (funcs->destroy)
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{
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#define HB_PAINT_FUNC_IMPLEMENT(name) \
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if (funcs->destroy->name) funcs->destroy->name (!funcs->user_data ? nullptr : funcs->user_data->name);
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HB_PAINT_FUNCS_IMPLEMENT_CALLBACKS
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#undef HB_PAINT_FUNC_IMPLEMENT
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}
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hb_free (funcs->destroy);
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hb_free (funcs->user_data);
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hb_free (funcs);
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}
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/**
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* hb_paint_funcs_set_user_data: (skip)
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* @funcs: The paint-functions structure
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* @key: The user-data key
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* @data: A pointer to the user data
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* @destroy: (nullable): A callback to call when @data is not needed anymore
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* @replace: Whether to replace an existing data with the same key
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*
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* Attaches a user-data key/data pair to the specified paint-functions structure.
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*
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* Return value: `true` if success, `false` otherwise
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*
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* XSince: REPLACEME
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**/
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hb_bool_t
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hb_paint_funcs_set_user_data (hb_paint_funcs_t *funcs,
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hb_user_data_key_t *key,
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void * data,
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hb_destroy_func_t destroy,
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hb_bool_t replace)
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{
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return hb_object_set_user_data (funcs, key, data, destroy, replace);
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}
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/**
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* hb_paint_funcs_get_user_data: (skip)
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* @funcs: The paint-functions structure
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* @key: The user-data key to query
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*
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* Fetches the user-data associated with the specified key,
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* attached to the specified paint-functions structure.
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*
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* Return value: (transfer none): A pointer to the user data
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*
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* XSince: REPLACEME
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**/
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void *
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hb_paint_funcs_get_user_data (const hb_paint_funcs_t *funcs,
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hb_user_data_key_t *key)
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{
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return hb_object_get_user_data (funcs, key);
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}
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/**
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* hb_paint_funcs_make_immutable:
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* @funcs: The paint-functions structure
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*
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* Makes a paint-functions structure immutable.
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*
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* After this call, all attempts to set one of the callbacks
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* on @funcs will fail.
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*
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* XSince: REPLACEME
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*/
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void
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hb_paint_funcs_make_immutable (hb_paint_funcs_t *funcs)
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{
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if (hb_object_is_immutable (funcs))
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return;
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hb_object_make_immutable (funcs);
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}
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/**
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* hb_paint_funcs_is_immutable:
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* @funcs: The paint-functions structure
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*
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* Tests whether a paint-functions structure is immutable.
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*
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* Return value: `true` if @funcs is immutable, `false` otherwise
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*
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* XSince: REPLACEME
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*/
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hb_bool_t
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hb_paint_funcs_is_immutable (hb_paint_funcs_t *funcs)
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{
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return hb_object_is_immutable (funcs);
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}
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/**
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* hb_color_line_get_color_stops:
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* @color_line: a #hb_color_line_t object
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* @start: the index of the first color stop to return
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* @count: (inout) (optional): Input = the maximum number of feature tags to return;
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* Output = the actual number of feature tags returned (may be zero)
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* @color_stops: (out) (array length=count) (optional): Array of #hb_color_stop_t to populate
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*
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* Fetches a list of color stops from the given color line object.
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*
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* Note that due to variations being applied, the returned color stops
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* may be out of order. It is the callers responsibility to ensure that
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* color stops are sorted by their offset before they are used.
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*
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* Return value: the total number of color stops in @color_line
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*
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* XSince: REPLACEME
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*/
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unsigned int
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hb_color_line_get_color_stops (hb_color_line_t *color_line,
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unsigned int start,
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unsigned int *count,
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hb_color_stop_t *color_stops)
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{
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return color_line->get_color_stops (color_line,
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color_line->data,
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start, count,
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color_stops,
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color_line->get_color_stops_user_data);
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}
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/**
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* hb_color_line_get_extend:
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* @color_line: a #hb_color_line_t object
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*
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* Fetches the extend mode of the color line object.
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*
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* Return value: the extend mode of @color_line
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*
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* XSince: REPLACEME
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*/
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hb_paint_extend_t
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hb_color_line_get_extend (hb_color_line_t *color_line)
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{
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return color_line->get_extend (color_line,
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color_line->data,
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color_line->get_extend_user_data);
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}
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/**
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* hb_paint_push_transform:
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* @funcs: paint functions
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* @paint_data: associated data passed by the caller
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* @xx: xx component of the transform matrix
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* @yx: yx component of the transform matrix
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* @xy: xy component of the transform matrix
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* @yy: yy component of the transform matrix
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* @dx: dx component of the transform matrix
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* @dy: dy component of the transform matrix
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*
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* Perform a "push-transform" paint operation.
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*
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* XSince: REPLACEME
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*/
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void
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hb_paint_push_transform (hb_paint_funcs_t *funcs, 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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{
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funcs->push_transform (paint_data, xx, yx, xy, yy, dx, dy);
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}
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/**
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* hb_paint_pop_transform:
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* @funcs: paint functions
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* @paint_data: associated data passed by the caller
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*
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* Perform a "pop-transform" paint operation.
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*
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* XSince: REPLACEME
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*/
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void
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hb_paint_pop_transform (hb_paint_funcs_t *funcs, void *paint_data)
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{
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funcs->pop_transform (paint_data);
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}
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/**
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* hb_paint_push_clip_glyph:
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* @funcs: paint functions
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* @paint_data: associated data passed by the caller
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* @glyph: the glyph ID
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* @font: the font
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*
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* Perform a "push-clip-glyph" paint operation.
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*
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* XSince: REPLACEME
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*/
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void
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hb_paint_push_clip_glyph (hb_paint_funcs_t *funcs, void *paint_data,
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hb_codepoint_t glyph,
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hb_font_t *font)
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{
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funcs->push_clip_glyph (paint_data, glyph, font);
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}
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/**
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* hb_paint_push_clip_rectangle:
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* @funcs: paint functions
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* @paint_data: associated data passed by the caller
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* @xmin: min X for the rectangle
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* @ymin: min Y for the rectangle
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* @xmax: max X for the rectangle
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* @ymax: max Y for the rectangle
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*
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* Perform a "push-clip-rect" paint operation.
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*
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* XSince: REPLACEME
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*/
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void
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hb_paint_push_clip_rectangle (hb_paint_funcs_t *funcs, void *paint_data,
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float xmin, float ymin, float xmax, float ymax)
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|
{
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|
funcs->push_clip_rectangle (paint_data, xmin, ymin, xmax, ymax);
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|
}
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|
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|
/**
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|
* hb_paint_pop_clip:
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|
* @funcs: paint functions
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|
* @paint_data: associated data passed by the caller
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|
*
|
|
* Perform a "pop-clip" paint operation.
|
|
*
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|
* XSince: REPLACEME
|
|
*/
|
|
void
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|
hb_paint_pop_clip (hb_paint_funcs_t *funcs, void *paint_data)
|
|
{
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|
funcs->pop_clip (paint_data);
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|
}
|
|
|
|
/**
|
|
* hb_paint_color:
|
|
* @funcs: paint functions
|
|
* @paint_data: associated data passed by the caller
|
|
* @is_foreground: whether the color is the foreground
|
|
* @color: The color to use
|
|
*
|
|
* Perform a "color" paint operation.
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|
*
|
|
* XSince: REPLACEME
|
|
*/
|
|
void
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|
hb_paint_color (hb_paint_funcs_t *funcs, void *paint_data,
|
|
hb_bool_t is_foreground,
|
|
hb_color_t color)
|
|
{
|
|
funcs->color (paint_data, is_foreground, color);
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|
}
|
|
|
|
/**
|
|
* hb_paint_image:
|
|
* @funcs: paint functions
|
|
* @paint_data: associated data passed by the caller
|
|
* @image: image data
|
|
* @width: width of the raster image in pixels, or 0
|
|
* @height: height of the raster image in pixels, or 0
|
|
* @format: the image format as a tag
|
|
* @slant: the synthetic slant ratio to be applied to the image during rendering
|
|
* @extents: (nullable): the extents of the glyph
|
|
*
|
|
* Perform a "image" paint operation.
|
|
*
|
|
* XSince: REPLACEME
|
|
*/
|
|
void
|
|
hb_paint_image (hb_paint_funcs_t *funcs, void *paint_data,
|
|
hb_blob_t *image,
|
|
unsigned int width,
|
|
unsigned int height,
|
|
hb_tag_t format,
|
|
float slant,
|
|
hb_glyph_extents_t *extents)
|
|
{
|
|
funcs->image (paint_data, image, width, height, format, slant, extents);
|
|
}
|
|
|
|
/**
|
|
* hb_paint_linear_gradient:
|
|
* @funcs: paint functions
|
|
* @paint_data: associated data passed by the caller
|
|
* @color_line: Color information for the gradient
|
|
* @x0: X coordinate of the first point
|
|
* @y0: Y coordinate of the first point
|
|
* @x1: X coordinate of the second point
|
|
* @y1: Y coordinate of the second point
|
|
* @x2: X coordinate of the third point
|
|
* @y2: Y coordinate of the third point
|
|
*
|
|
* Perform a "linear-gradient" paint operation.
|
|
*
|
|
* XSince: REPLACEME
|
|
*/
|
|
void
|
|
hb_paint_linear_gradient (hb_paint_funcs_t *funcs, void *paint_data,
|
|
hb_color_line_t *color_line,
|
|
float x0, float y0,
|
|
float x1, float y1,
|
|
float x2, float y2)
|
|
{
|
|
funcs->linear_gradient (paint_data, color_line, x0, y0, x1, y1, x2, y2);
|
|
}
|
|
|
|
/**
|
|
* hb_paint_radial_gradient:
|
|
* @funcs: paint functions
|
|
* @paint_data: associated data passed by the caller
|
|
* @color_line: Color information for the gradient
|
|
* @x0: X coordinate of the first circle's center
|
|
* @y0: Y coordinate of the first circle's center
|
|
* @r0: radius of the first circle
|
|
* @x1: X coordinate of the second circle's center
|
|
* @y1: Y coordinate of the second circle's center
|
|
* @r1: radius of the second circle
|
|
*
|
|
* Perform a "radial-gradient" paint operation.
|
|
*
|
|
* XSince: REPLACEME
|
|
*/
|
|
void
|
|
hb_paint_radial_gradient (hb_paint_funcs_t *funcs, void *paint_data,
|
|
hb_color_line_t *color_line,
|
|
float x0, float y0, float r0,
|
|
float x1, float y1, float r1)
|
|
{
|
|
funcs->radial_gradient (paint_data, color_line, x0, y0, r0, y1, x1, r1);
|
|
}
|
|
|
|
/**
|
|
* hb_paint_sweep_gradient:
|
|
* @funcs: paint functions
|
|
* @paint_data: associated data passed by the caller
|
|
* @color_line: Color information for the gradient
|
|
* @x0: X coordinate of the circle's center
|
|
* @y0: Y coordinate of the circle's center
|
|
* @start_angle: the start angle
|
|
* @end_angle: the end angle
|
|
*
|
|
* Perform a "sweep-gradient" paint operation.
|
|
*
|
|
* XSince: REPLACEME
|
|
*/
|
|
void
|
|
hb_paint_sweep_gradient (hb_paint_funcs_t *funcs, void *paint_data,
|
|
hb_color_line_t *color_line,
|
|
float x0, float y0,
|
|
float start_angle, float end_angle)
|
|
{
|
|
funcs->sweep_gradient (paint_data, color_line, x0, y0, start_angle, end_angle);
|
|
}
|
|
|
|
/**
|
|
* hb_paint_push_group:
|
|
* @funcs: paint functions
|
|
* @paint_data: associated data passed by the caller
|
|
*
|
|
* Perform a "push-group" paint operation.
|
|
*
|
|
* XSince: REPLACEME
|
|
*/
|
|
void
|
|
hb_paint_push_group (hb_paint_funcs_t *funcs, void *paint_data)
|
|
{
|
|
funcs->push_group (paint_data);
|
|
}
|
|
|
|
/**
|
|
* hb_paint_pop_group:
|
|
* @funcs: paint functions
|
|
* @paint_data: associated data passed by the caller
|
|
* @mode: the compositing mode to use
|
|
*
|
|
* Perform a "pop-group" paint operation.
|
|
*
|
|
* XSince: REPLACEME
|
|
*/
|
|
void
|
|
hb_paint_pop_group (hb_paint_funcs_t *funcs, void *paint_data,
|
|
hb_paint_composite_mode_t mode)
|
|
{
|
|
funcs->pop_group (paint_data, mode);
|
|
}
|
|
|
|
/**
|
|
* hb_paint_custom_palette_color:
|
|
* @funcs: paint functions
|
|
* @paint_data: associated data passed by the caller
|
|
* @color_index: color index
|
|
* @color: (out): fetched color
|
|
*
|
|
* Gets the custom palette color for @color_index.
|
|
*
|
|
* Return value: `true` if found, `false` otherwise
|
|
*
|
|
* XSince: REPLACEME
|
|
*/
|
|
hb_bool_t
|
|
hb_paint_custom_palette_color (hb_paint_funcs_t *funcs, void *paint_data,
|
|
unsigned int color_index,
|
|
hb_color_t *color)
|
|
{
|
|
return funcs->custom_palette_color (paint_data, color_index, color);
|
|
}
|
|
|
|
#endif
|