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