221 lines
7.5 KiB
C++
221 lines
7.5 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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#ifndef HB_PAINT_HH
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#define HB_PAINT_HH
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#include "hb.hh"
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#include "hb-face.hh"
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#include "hb-font.hh"
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#define HB_PAINT_FUNCS_IMPLEMENT_CALLBACKS \
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HB_PAINT_FUNC_IMPLEMENT (push_transform) \
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HB_PAINT_FUNC_IMPLEMENT (pop_transform) \
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HB_PAINT_FUNC_IMPLEMENT (push_clip_glyph) \
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HB_PAINT_FUNC_IMPLEMENT (push_clip_rectangle) \
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HB_PAINT_FUNC_IMPLEMENT (pop_clip) \
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HB_PAINT_FUNC_IMPLEMENT (color) \
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HB_PAINT_FUNC_IMPLEMENT (image) \
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HB_PAINT_FUNC_IMPLEMENT (linear_gradient) \
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HB_PAINT_FUNC_IMPLEMENT (radial_gradient) \
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HB_PAINT_FUNC_IMPLEMENT (sweep_gradient) \
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HB_PAINT_FUNC_IMPLEMENT (push_group) \
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HB_PAINT_FUNC_IMPLEMENT (pop_group) \
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/* ^--- Add new callbacks here */
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struct hb_paint_funcs_t
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{
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hb_object_header_t header;
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struct {
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#define HB_PAINT_FUNC_IMPLEMENT(name) hb_paint_##name##_func_t name;
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HB_PAINT_FUNCS_IMPLEMENT_CALLBACKS
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#undef HB_PAINT_FUNC_IMPLEMENT
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} func;
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struct {
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#define HB_PAINT_FUNC_IMPLEMENT(name) void *name;
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HB_PAINT_FUNCS_IMPLEMENT_CALLBACKS
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#undef HB_PAINT_FUNC_IMPLEMENT
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} *user_data;
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struct {
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#define HB_PAINT_FUNC_IMPLEMENT(name) hb_destroy_func_t name;
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HB_PAINT_FUNCS_IMPLEMENT_CALLBACKS
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#undef HB_PAINT_FUNC_IMPLEMENT
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} *destroy;
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void push_transform (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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{ func.push_transform (this, paint_data,
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xx, yx, xy, yy, dx, dy,
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!user_data ? nullptr : user_data->push_transform); }
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void pop_transform (void *paint_data)
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{ func.pop_transform (this, paint_data,
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!user_data ? nullptr : user_data->pop_transform); }
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void push_clip_glyph (void *paint_data,
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hb_codepoint_t glyph,
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hb_font_t *font)
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{ func.push_clip_glyph (this, paint_data,
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glyph,
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font,
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!user_data ? nullptr : user_data->push_clip_glyph); }
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void push_clip_rectangle (void *paint_data,
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float xmin, float ymin, float xmax, float ymax)
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{ func.push_clip_rectangle (this, paint_data,
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xmin, ymin, xmax, ymax,
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!user_data ? nullptr : user_data->push_clip_rectangle); }
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void pop_clip (void *paint_data)
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{ func.pop_clip (this, paint_data,
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!user_data ? nullptr : user_data->pop_clip); }
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void color (void *paint_data,
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hb_bool_t is_foreground,
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hb_color_t color)
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{ func.color (this, paint_data,
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is_foreground, color,
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!user_data ? nullptr : user_data->color); }
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bool image (void *paint_data,
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hb_blob_t *image,
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unsigned width, unsigned height,
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hb_tag_t format,
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float slant,
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hb_glyph_extents_t *extents)
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{ return func.image (this, paint_data,
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image, width, height, format, slant, extents,
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!user_data ? nullptr : user_data->image); }
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void linear_gradient (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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{ func.linear_gradient (this, paint_data,
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color_line, x0, y0, x1, y1, x2, y2,
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!user_data ? nullptr : user_data->linear_gradient); }
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void radial_gradient (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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{ func.radial_gradient (this, paint_data,
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color_line, x0, y0, r0, x1, y1, r1,
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!user_data ? nullptr : user_data->radial_gradient); }
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void sweep_gradient (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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{ func.sweep_gradient (this, paint_data,
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color_line, x0, y0, start_angle, end_angle,
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!user_data ? nullptr : user_data->sweep_gradient); }
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void push_group (void *paint_data)
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{ func.push_group (this, paint_data,
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!user_data ? nullptr : user_data->push_group); }
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void pop_group (void *paint_data,
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hb_paint_composite_mode_t mode)
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{ func.pop_group (this, paint_data,
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mode,
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!user_data ? nullptr : user_data->pop_group); }
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/* Internal specializations. */
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void push_root_transform (void *paint_data,
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const hb_font_t *font)
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{
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float upem = font->face->get_upem ();
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int xscale = font->x_scale, yscale = font->y_scale;
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float slant = font->slant_xy;
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push_transform (paint_data,
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xscale/upem, 0, slant * yscale/upem, yscale/upem, 0, 0);
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}
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void push_inverse_root_transform (void *paint_data,
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hb_font_t *font)
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{
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float upem = font->face->get_upem ();
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int xscale = font->x_scale ? font->x_scale : upem;
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int yscale = font->y_scale ? font->y_scale : upem;
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float slant = font->slant_xy;
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push_transform (paint_data,
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upem/xscale, 0, -slant * upem/xscale, upem/yscale, 0, 0);
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}
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HB_NODISCARD
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bool push_translate (void *paint_data,
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float dx, float dy)
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{
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if (!dx && !dy)
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return false;
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push_transform (paint_data,
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1.f, 0.f, 0.f, 1.f, dx, dy);
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return true;
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}
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HB_NODISCARD
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bool push_scale (void *paint_data,
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float sx, float sy)
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{
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if (sx == 1.f && sy == 1.f)
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return false;
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push_transform (paint_data,
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sx, 0.f, 0.f, sy, 0.f, 0.f);
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return true;
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}
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HB_NODISCARD
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bool push_rotate (void *paint_data,
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float a)
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{
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if (!a)
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return false;
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float cc = cosf (a * (float) M_PI);
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float ss = sinf (a * (float) M_PI);
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push_transform (paint_data, cc, ss, -ss, cc, 0.f, 0.f);
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return true;
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}
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HB_NODISCARD
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bool push_skew (void *paint_data,
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float sx, float sy)
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{
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if (!sx && !sy)
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return false;
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float x = +tanf (sx * (float) M_PI);
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float y = -tanf (sy * (float) M_PI);
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push_transform (paint_data, 1.f, y, x, 1.f, 0.f, 0.f);
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return true;
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}
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};
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DECLARE_NULL_INSTANCE (hb_paint_funcs_t);
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#endif /* HB_PAINT_HH */
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