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| -rw-r--r-- | gfx/harfbuzz/src/hb-paint.cc | 703 |
1 files changed, 703 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-paint.cc b/gfx/harfbuzz/src/hb-paint.cc new file mode 100644 index 0000000000..28150f1638 --- /dev/null +++ b/gfx/harfbuzz/src/hb-paint.cc @@ -0,0 +1,703 @@ +/* + * Copyright © 2022 Matthias Clasen + * + * 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.hh" + +/** + * SECTION: hb-paint + * @title: hb-paint + * @short_description: Glyph painting + * @include: hb.h + * + * Functions for painting glyphs. + * + * The main purpose of these functions is to paint (extract) color glyph layers + * from the COLRv1 table, but the API works for drawing ordinary outlines and + * images as well. + * + * The #hb_paint_funcs_t struct can be used with hb_font_paint_glyph(). + **/ + +static void +hb_paint_push_transform_nil (hb_paint_funcs_t *funcs, void *paint_data, + float xx, float yx, + float xy, float yy, + float dx, float dy, + void *user_data) {} + +static void +hb_paint_pop_transform_nil (hb_paint_funcs_t *funcs, void *paint_data, + void *user_data) {} + +static void +hb_paint_push_clip_glyph_nil (hb_paint_funcs_t *funcs, void *paint_data, + hb_codepoint_t glyph, + hb_font_t *font, + void *user_data) {} + +static void +hb_paint_push_clip_rectangle_nil (hb_paint_funcs_t *funcs, void *paint_data, + float xmin, float ymin, float xmax, float ymax, + void *user_data) {} + +static void +hb_paint_pop_clip_nil (hb_paint_funcs_t *funcs, void *paint_data, + void *user_data) {} + +static void +hb_paint_color_nil (hb_paint_funcs_t *funcs, void *paint_data, + hb_bool_t is_foreground, + hb_color_t color, + void *user_data) {} + +static hb_bool_t +hb_paint_image_nil (hb_paint_funcs_t *funcs, void *paint_data, + hb_blob_t *image, + unsigned int width, + unsigned int height, + hb_tag_t format, + float slant_xy, + hb_glyph_extents_t *extents, + void *user_data) { return false; } + +static void +hb_paint_linear_gradient_nil (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, + void *user_data) {} + +static void +hb_paint_radial_gradient_nil (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, + void *user_data) {} + +static void +hb_paint_sweep_gradient_nil (hb_paint_funcs_t *funcs, void *paint_data, + hb_color_line_t *color_line, + float x0, float y0, + float start_angle, + float end_angle, + void *user_data) {} + +static void +hb_paint_push_group_nil (hb_paint_funcs_t *funcs, void *paint_data, + void *user_data) {} + +static void +hb_paint_pop_group_nil (hb_paint_funcs_t *funcs, void *paint_data, + hb_paint_composite_mode_t mode, + void *user_data) {} + +static hb_bool_t +hb_paint_custom_palette_color_nil (hb_paint_funcs_t *funcs, void *paint_data, + unsigned int color_index, + hb_color_t *color, + void *user_data) { return false; } + +static bool +_hb_paint_funcs_set_preamble (hb_paint_funcs_t *funcs, + bool func_is_null, + void **user_data, + hb_destroy_func_t *destroy) +{ + if (hb_object_is_immutable (funcs)) + { + if (*destroy) + (*destroy) (*user_data); + return false; + } + + if (func_is_null) + { + if (*destroy) + (*destroy) (*user_data); + *destroy = nullptr; + *user_data = nullptr; + } + + return true; +} + +static bool +_hb_paint_funcs_set_middle (hb_paint_funcs_t *funcs, + void *user_data, + hb_destroy_func_t destroy) +{ + if (user_data && !funcs->user_data) + { + funcs->user_data = (decltype (funcs->user_data)) hb_calloc (1, sizeof (*funcs->user_data)); + if (unlikely (!funcs->user_data)) + goto fail; + } + if (destroy && !funcs->destroy) + { + funcs->destroy = (decltype (funcs->destroy)) hb_calloc (1, sizeof (*funcs->destroy)); + if (unlikely (!funcs->destroy)) + goto fail; + } + + return true; + +fail: + if (destroy) + (destroy) (user_data); + return false; +} + +#define HB_PAINT_FUNC_IMPLEMENT(name) \ + \ +void \ +hb_paint_funcs_set_##name##_func (hb_paint_funcs_t *funcs, \ + hb_paint_##name##_func_t func, \ + void *user_data, \ + hb_destroy_func_t destroy) \ +{ \ + if (!_hb_paint_funcs_set_preamble (funcs, !func, &user_data, &destroy)) \ + return; \ + \ + if (funcs->destroy && funcs->destroy->name) \ + funcs->destroy->name (!funcs->user_data ? nullptr : funcs->user_data->name);\ + \ + if (!_hb_paint_funcs_set_middle (funcs, user_data, destroy)) \ + return; \ + \ + if (func) \ + funcs->func.name = func; \ + else \ + funcs->func.name = hb_paint_##name##_nil; \ + \ + if (funcs->user_data) \ + funcs->user_data->name = user_data; \ + if (funcs->destroy) \ + funcs->destroy->name = destroy; \ +} + +HB_PAINT_FUNCS_IMPLEMENT_CALLBACKS +#undef HB_PAINT_FUNC_IMPLEMENT + +/** + * hb_paint_funcs_create: + * + * Creates a new #hb_paint_funcs_t structure of paint functions. + * + * The initial reference count of 1 should be released with hb_paint_funcs_destroy() + * when you are done using the #hb_paint_funcs_t. This function never returns + * `NULL`. If memory cannot be allocated, a special singleton #hb_paint_funcs_t + * object will be returned. + * + * Returns value: (transfer full): the paint-functions structure + * + * Since: 7.0.0 + */ +hb_paint_funcs_t * +hb_paint_funcs_create () +{ + hb_paint_funcs_t *funcs; + if (unlikely (!(funcs = hb_object_create<hb_paint_funcs_t> ()))) + return const_cast<hb_paint_funcs_t *> (&Null (hb_paint_funcs_t)); + + funcs->func = Null (hb_paint_funcs_t).func; + + return funcs; +} + +DEFINE_NULL_INSTANCE (hb_paint_funcs_t) = +{ + HB_OBJECT_HEADER_STATIC, + + { +#define HB_PAINT_FUNC_IMPLEMENT(name) hb_paint_##name##_nil, + HB_PAINT_FUNCS_IMPLEMENT_CALLBACKS +#undef HB_PAINT_FUNC_IMPLEMENT + } +}; + +/** + * hb_paint_funcs_get_empty: + * + * Fetches the singleton empty paint-functions structure. + * + * Return value: (transfer full): The empty paint-functions structure + * + * Since: 7.0.0 + **/ +hb_paint_funcs_t * +hb_paint_funcs_get_empty () +{ + return const_cast<hb_paint_funcs_t *> (&Null (hb_paint_funcs_t)); +} + +/** + * hb_paint_funcs_reference: (skip) + * @funcs: The paint-functions structure + * + * Increases the reference count on a paint-functions structure. + * + * This prevents @funcs from being destroyed until a matching + * call to hb_paint_funcs_destroy() is made. + * + * Return value: The paint-functions structure + * + * Since: 7.0.0 + */ +hb_paint_funcs_t * +hb_paint_funcs_reference (hb_paint_funcs_t *funcs) +{ + return hb_object_reference (funcs); +} + +/** + * hb_paint_funcs_destroy: (skip) + * @funcs: The paint-functions structure + * + * Decreases the reference count on a paint-functions structure. + * + * When the reference count reaches zero, the structure + * is destroyed, freeing all memory. + * + * Since: 7.0.0 + */ +void +hb_paint_funcs_destroy (hb_paint_funcs_t *funcs) +{ + if (!hb_object_destroy (funcs)) return; + + if (funcs->destroy) + { +#define HB_PAINT_FUNC_IMPLEMENT(name) \ + if (funcs->destroy->name) funcs->destroy->name (!funcs->user_data ? nullptr : funcs->user_data->name); + HB_PAINT_FUNCS_IMPLEMENT_CALLBACKS +#undef HB_PAINT_FUNC_IMPLEMENT + } + + hb_free (funcs->destroy); + hb_free (funcs->user_data); + hb_free (funcs); +} + +/** + * hb_paint_funcs_set_user_data: (skip) + * @funcs: The paint-functions structure + * @key: The user-data key + * @data: A pointer to the user data + * @destroy: (nullable): A callback to call when @data is not needed anymore + * @replace: Whether to replace an existing data with the same key + * + * Attaches a user-data key/data pair to the specified paint-functions structure. + * + * Return value: `true` if success, `false` otherwise + * + * Since: 7.0.0 + **/ +hb_bool_t +hb_paint_funcs_set_user_data (hb_paint_funcs_t *funcs, + hb_user_data_key_t *key, + void * data, + hb_destroy_func_t destroy, + hb_bool_t replace) +{ + return hb_object_set_user_data (funcs, key, data, destroy, replace); +} + +/** + * hb_paint_funcs_get_user_data: (skip) + * @funcs: The paint-functions structure + * @key: The user-data key to query + * + * Fetches the user-data associated with the specified key, + * attached to the specified paint-functions structure. + * + * Return value: (transfer none): A pointer to the user data + * + * Since: 7.0.0 + **/ +void * +hb_paint_funcs_get_user_data (const hb_paint_funcs_t *funcs, + hb_user_data_key_t *key) +{ + return hb_object_get_user_data (funcs, key); +} + +/** + * hb_paint_funcs_make_immutable: + * @funcs: The paint-functions structure + * + * Makes a paint-functions structure immutable. + * + * After this call, all attempts to set one of the callbacks + * on @funcs will fail. + * + * Since: 7.0.0 + */ +void +hb_paint_funcs_make_immutable (hb_paint_funcs_t *funcs) +{ + if (hb_object_is_immutable (funcs)) + return; + + hb_object_make_immutable (funcs); +} + +/** + * hb_paint_funcs_is_immutable: + * @funcs: The paint-functions structure + * + * Tests whether a paint-functions structure is immutable. + * + * Return value: `true` if @funcs is immutable, `false` otherwise + * + * Since: 7.0.0 + */ +hb_bool_t +hb_paint_funcs_is_immutable (hb_paint_funcs_t *funcs) +{ + return hb_object_is_immutable (funcs); +} + + +/** + * hb_color_line_get_color_stops: + * @color_line: a #hb_color_line_t object + * @start: the index of the first color stop to return + * @count: (inout) (optional): Input = the maximum number of feature tags to return; + * Output = the actual number of feature tags returned (may be zero) + * @color_stops: (out) (array length=count) (optional): Array of #hb_color_stop_t to populate + * + * Fetches a list of color stops from the given color line object. + * + * Note that due to variations being applied, the returned color stops + * may be out of order. It is the callers responsibility to ensure that + * color stops are sorted by their offset before they are used. + * + * Return value: the total number of color stops in @color_line + * + * Since: 7.0.0 + */ +unsigned int +hb_color_line_get_color_stops (hb_color_line_t *color_line, + unsigned int start, + unsigned int *count, + hb_color_stop_t *color_stops) +{ + return color_line->get_color_stops (color_line, + color_line->data, + start, count, + color_stops, + color_line->get_color_stops_user_data); +} + +/** + * hb_color_line_get_extend: + * @color_line: a #hb_color_line_t object + * + * Fetches the extend mode of the color line object. + * + * Return value: the extend mode of @color_line + * + * Since: 7.0.0 + */ +hb_paint_extend_t +hb_color_line_get_extend (hb_color_line_t *color_line) +{ + return color_line->get_extend (color_line, + color_line->data, + color_line->get_extend_user_data); +} + + +/** + * hb_paint_push_transform: + * @funcs: paint functions + * @paint_data: associated data passed by the caller + * @xx: xx component of the transform matrix + * @yx: yx component of the transform matrix + * @xy: xy component of the transform matrix + * @yy: yy component of the transform matrix + * @dx: dx component of the transform matrix + * @dy: dy component of the transform matrix + * + * Perform a "push-transform" paint operation. + * + * Since: 7.0.0 + */ +void +hb_paint_push_transform (hb_paint_funcs_t *funcs, void *paint_data, + float xx, float yx, + float xy, float yy, + float dx, float dy) +{ + funcs->push_transform (paint_data, xx, yx, xy, yy, dx, dy); +} + +/** + * hb_paint_pop_transform: + * @funcs: paint functions + * @paint_data: associated data passed by the caller + * + * Perform a "pop-transform" paint operation. + * + * Since: 7.0.0 + */ +void +hb_paint_pop_transform (hb_paint_funcs_t *funcs, void *paint_data) +{ + funcs->pop_transform (paint_data); +} + +/** + * hb_paint_push_clip_glyph: + * @funcs: paint functions + * @paint_data: associated data passed by the caller + * @glyph: the glyph ID + * @font: the font + * + * Perform a "push-clip-glyph" paint operation. + * + * Since: 7.0.0 + */ +void +hb_paint_push_clip_glyph (hb_paint_funcs_t *funcs, void *paint_data, + hb_codepoint_t glyph, + hb_font_t *font) +{ + funcs->push_clip_glyph (paint_data, glyph, font); +} + +/** + * hb_paint_push_clip_rectangle: + * @funcs: paint functions + * @paint_data: associated data passed by the caller + * @xmin: min X for the rectangle + * @ymin: min Y for the rectangle + * @xmax: max X for the rectangle + * @ymax: max Y for the rectangle + * + * Perform a "push-clip-rect" paint operation. + * + * Since: 7.0.0 + */ +void +hb_paint_push_clip_rectangle (hb_paint_funcs_t *funcs, void *paint_data, + float xmin, float ymin, float xmax, float ymax) +{ + funcs->push_clip_rectangle (paint_data, xmin, ymin, xmax, ymax); +} + +/** + * hb_paint_pop_clip: + * @funcs: paint functions + * @paint_data: associated data passed by the caller + * + * Perform a "pop-clip" paint operation. + * + * Since: 7.0.0 + */ +void +hb_paint_pop_clip (hb_paint_funcs_t *funcs, void *paint_data) +{ + funcs->pop_clip (paint_data); +} + +/** + * 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. + * + * Since: 7.0.0 + */ +void +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); +} + +/** + * 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. + * + * Since: 7.0.0 + */ +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. + * + * Since: 7.0.0 + */ +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. + * + * Since: 7.0.0 + */ +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. + * + * Since: 7.0.0 + */ +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. + * + * Since: 7.0.0 + */ +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. + * + * Since: 7.0.0 + */ +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 + * + * Since: 7.0.0 + */ +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 |