2022-12-18 07:52:39 +01:00
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/*
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* Copyright © 2022 Red Hat, Inc
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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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* Google Author(s): Matthias Clasen
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*/
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2022-12-19 05:36:05 +01:00
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#include "config.h"
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2022-12-18 20:55:56 +01:00
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#include "hb-cairo-utils.h"
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2022-12-18 07:52:39 +01:00
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#include <cairo.h>
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#include <hb-ot.h>
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#include <string.h>
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#include <stdlib.h>
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2022-12-18 20:56:01 +01:00
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#include <stdio.h>
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2022-12-19 05:36:05 +01:00
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#define _USE_MATH_DEFINES
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2022-12-18 07:52:39 +01:00
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#include <math.h>
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#include <assert.h>
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#ifndef MIN
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#define MIN(x,y) ((x) < (y) ? (x) : (y))
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#endif
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#ifndef MAX
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#define MAX(x,y) ((x) > (y) ? (x) : (y))
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#endif
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2022-12-19 06:07:18 +01:00
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#define PREALLOCATED_COLOR_STOPS 16
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2022-12-18 07:52:39 +01:00
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typedef struct {
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float r, g, b, a;
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} color_t;
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static inline cairo_extend_t
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cairo_extend (hb_paint_extend_t extend)
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{
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switch (extend)
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{
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case HB_PAINT_EXTEND_PAD: return CAIRO_EXTEND_PAD;
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case HB_PAINT_EXTEND_REPEAT: return CAIRO_EXTEND_REPEAT;
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case HB_PAINT_EXTEND_REFLECT: return CAIRO_EXTEND_REFLECT;
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default:;
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}
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return CAIRO_EXTEND_PAD;
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}
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void
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hb_face_get_color (hb_face_t *face,
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unsigned int palette_index,
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unsigned int color_index,
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float alpha,
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float *r, float *g, float *b, float *a)
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{
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if (color_index == 0xffff)
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{
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/* foreground color */
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*r = *g = *b = 0;
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*a = alpha;
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}
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else
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{
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hb_color_t color;
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unsigned int clen = 1;
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if (hb_ot_color_palette_get_colors (face, palette_index, color_index, &clen, &color))
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{
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*r = hb_color_get_red (color) / 255.f;
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*g = hb_color_get_green (color) / 255.f;
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*b = hb_color_get_blue (color) / 255.f;
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*a = (hb_color_get_alpha (color) / 255.f) * alpha;
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}
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else
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{
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*r = *g = *b = 0;
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*a = alpha;
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}
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}
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}
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typedef struct
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{
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hb_blob_t *blob;
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unsigned int offset;
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} read_blob_data_t;
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static cairo_status_t
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read_blob (void *closure,
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unsigned char *data,
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unsigned int length)
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{
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read_blob_data_t *r = (read_blob_data_t *) closure;
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const char *d;
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unsigned int size;
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d = hb_blob_get_data (r->blob, &size);
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if (r->offset + length > size)
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return CAIRO_STATUS_READ_ERROR;
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memcpy (data, d + r->offset, length);
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r->offset += length;
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return CAIRO_STATUS_SUCCESS;
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}
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void
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2022-12-18 20:51:26 +01:00
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hb_cairo_paint_glyph_image (cairo_t *cr,
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hb_font_t *font,
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2022-12-18 07:52:39 +01:00
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hb_blob_t *blob,
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hb_tag_t format,
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hb_glyph_extents_t *extents)
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{
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2022-12-19 05:36:05 +01:00
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#ifdef CAIRO_HAS_PNG_FUNCTIONS
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2022-12-18 07:52:39 +01:00
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if (format != HB_PAINT_IMAGE_FORMAT_PNG || !extents)
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return;
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read_blob_data_t r;
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r.blob = blob;
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r.offset = 0;
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cairo_surface_t *surface = cairo_image_surface_create_from_png_stream (read_blob, &r);
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int width = cairo_image_surface_get_width (surface);
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int height = cairo_image_surface_get_width (surface);
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cairo_pattern_t *pattern = cairo_pattern_create_for_surface (surface);
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cairo_pattern_set_extend (pattern, CAIRO_EXTEND_PAD);
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cairo_matrix_t matrix = {(double) width, 0, 0, (double) height, 0, 0};
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cairo_pattern_set_matrix (pattern, &matrix);
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cairo_translate (cr, extents->x_bearing, extents->y_bearing);
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cairo_scale (cr, extents->width, extents->height);
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cairo_set_source (cr, pattern);
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cairo_paint (cr);
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cairo_pattern_destroy (pattern);
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cairo_surface_destroy (surface);
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2022-12-19 05:36:05 +01:00
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#endif
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2022-12-18 07:52:39 +01:00
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}
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static void
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reduce_anchors (float x0, float y0,
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float x1, float y1,
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float x2, float y2,
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float *xx0, float *yy0,
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float *xx1, float *yy1)
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{
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float q1x, q1y, q2x, q2y;
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float s;
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float k;
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q2x = x2 - x0;
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q2y = y2 - y0;
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q1x = y1 - x0;
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q1y = y1 - y0;
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s = q2x * q2x + q2y * q2y;
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if (s < 0.000001f)
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{
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*xx0 = x0; *yy0 = y0;
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*xx1 = x1; *yy1 = y1;
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return;
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}
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k = (q2x * q1x + q2y * q1y) / s;
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*xx0 = x0;
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*yy0 = y0;
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*xx1 = x1 - k * q2x;
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*yy1 = y1 - k * q2y;
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}
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static int
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cmp_color_stop (const void *p1,
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const void *p2)
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{
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const hb_color_stop_t *c1 = (const hb_color_stop_t *) p1;
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const hb_color_stop_t *c2 = (const hb_color_stop_t *) p2;
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if (c1->offset < c2->offset)
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return -1;
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else if (c1->offset > c2->offset)
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return 1;
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else
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return 0;
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}
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static void
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normalize_color_line (hb_color_stop_t *stops,
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unsigned int len,
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float *omin,
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float *omax)
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{
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float min, max;
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qsort (stops, len, sizeof (hb_color_stop_t), cmp_color_stop);
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min = max = stops[0].offset;
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for (unsigned int i = 0; i < len; i++)
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{
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min = MIN (min, stops[i].offset);
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max = MAX (max, stops[i].offset);
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}
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if (min != max)
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{
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for (unsigned int i = 0; i < len; i++)
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stops[i].offset = (stops[i].offset - min) / (max - min);
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}
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*omin = min;
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*omax = max;
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}
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void
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hb_cairo_paint_linear_gradient (cairo_t *cr,
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hb_font_t *font,
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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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{
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hb_face_t *face = hb_font_get_face (font);
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2022-12-19 06:07:18 +01:00
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hb_color_stop_t stops_[PREALLOCATED_COLOR_STOPS];
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hb_color_stop_t *stops = stops_;
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2022-12-18 07:52:39 +01:00
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unsigned int len;
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float xx0, yy0, xx1, yy1;
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float xxx0, yyy0, xxx1, yyy1;
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float min, max;
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cairo_pattern_t *pattern;
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len = hb_color_line_get_color_stops (color_line, 0, NULL, NULL);
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2022-12-19 06:07:18 +01:00
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if (len > PREALLOCATED_COLOR_STOPS)
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stops = (hb_color_stop_t *) malloc (len * sizeof (hb_color_stop_t));
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2022-12-18 07:52:39 +01:00
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hb_color_line_get_color_stops (color_line, 0, &len, stops);
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2022-12-19 06:07:18 +01:00
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2022-12-18 07:52:39 +01:00
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reduce_anchors (x0, y0, x1, y1, x2, y2, &xx0, &yy0, &xx1, &yy1);
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normalize_color_line (stops, len, &min, &max);
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xxx0 = xx0 + min * (xx1 - xx0);
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yyy0 = yy0 + min * (yy1 - yy0);
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xxx1 = xx0 + max * (xx1 - xx0);
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yyy1 = yy0 + max * (yy1 - yy0);
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pattern = cairo_pattern_create_linear (xxx0, yyy0, xxx1, yyy1);
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cairo_pattern_set_extend (pattern, cairo_extend (hb_color_line_get_extend (color_line)));
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for (unsigned int i = 0; i < len; i++)
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{
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float r, g, b, a;
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hb_face_get_color (face, 0, stops[i].color_index, stops[i].alpha, &r, &g, &b, &a);
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cairo_pattern_add_color_stop_rgba (pattern, stops[i].offset, r, g, b, a);
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}
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cairo_set_source (cr, pattern);
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cairo_paint (cr);
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cairo_pattern_destroy (pattern);
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2022-12-19 06:07:18 +01:00
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if (stops != stops_)
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free (stops);
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2022-12-18 07:52:39 +01:00
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}
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void
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hb_cairo_paint_radial_gradient (cairo_t *cr,
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hb_font_t *font,
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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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{
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hb_face_t *face = hb_font_get_face (font);
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2022-12-19 06:07:18 +01:00
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hb_color_stop_t stops_[PREALLOCATED_COLOR_STOPS];
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hb_color_stop_t *stops = stops_;
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2022-12-18 07:52:39 +01:00
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unsigned int len;
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float min, max;
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float xx0, yy0, xx1, yy1;
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float rr0, rr1;
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cairo_pattern_t *pattern;
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len = hb_color_line_get_color_stops (color_line, 0, NULL, NULL);
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2022-12-19 06:07:18 +01:00
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if (len > PREALLOCATED_COLOR_STOPS)
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stops = (hb_color_stop_t *) malloc (len * sizeof (hb_color_stop_t));
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2022-12-18 07:52:39 +01:00
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hb_color_line_get_color_stops (color_line, 0, &len, stops);
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2022-12-19 06:07:18 +01:00
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2022-12-18 07:52:39 +01:00
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normalize_color_line (stops, len, &min, &max);
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xx0 = x0 + min * (x1 - x0);
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yy0 = y0 + min * (y1 - y0);
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xx1 = x0 + max * (x1 - x0);
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yy1 = y0 + max * (y1 - y0);
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rr0 = r0 + min * (r1 - r0);
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rr1 = r0 + max * (r1 - r0);
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pattern = cairo_pattern_create_radial (xx0, yy0, rr0, xx1, yy1, rr1);
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cairo_pattern_set_extend (pattern, cairo_extend (hb_color_line_get_extend (color_line)));
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for (unsigned int i = 0; i < len; i++)
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{
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float r, g, b, a;
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hb_face_get_color (face, 0, stops[i].color_index, stops[i].alpha, &r, &g, &b, &a);
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cairo_pattern_add_color_stop_rgba (pattern, stops[i].offset, r, g, b, a);
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}
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cairo_set_source (cr, pattern);
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cairo_paint (cr);
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cairo_pattern_destroy (pattern);
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2022-12-19 06:07:18 +01:00
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if (stops != stops_)
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free (stops);
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2022-12-18 07:52:39 +01:00
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}
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typedef struct {
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float x, y;
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} Point;
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static inline float
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interpolate (float f0, float f1, float f)
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{
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return f0 + f * (f1 - f0);
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}
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2022-12-18 20:57:42 +01:00
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static void
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2022-12-18 07:52:39 +01:00
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|
|
interpolate_colors (color_t *c0, color_t *c1, float k, color_t *c)
|
|
|
|
{
|
|
|
|
c->r = c0->r + k * (c1->r - c0->r);
|
|
|
|
c->g = c0->g + k * (c1->g - c0->g);
|
|
|
|
c->b = c0->b + k * (c1->b - c0->b);
|
|
|
|
c->a = c0->a + k * (c1->a - c0->a);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline float
|
|
|
|
dot (Point p, Point q)
|
|
|
|
{
|
|
|
|
return p.x * q.x + p.y * q.y;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline Point
|
|
|
|
normalize (Point p)
|
|
|
|
{
|
|
|
|
float len = sqrt (dot (p, p));
|
|
|
|
|
|
|
|
return (Point) { p.x / len, p.y / len };
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline Point
|
|
|
|
sum (Point p, Point q)
|
|
|
|
{
|
|
|
|
return (Point) { p.x + q.x, p.y + q.y };
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline Point
|
|
|
|
difference (Point p, Point q)
|
|
|
|
{
|
|
|
|
return (Point) { p.x - q.x, p.y - q.y };
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline Point
|
|
|
|
scale (Point p, float f)
|
|
|
|
{
|
|
|
|
return (Point) { p.x * f, p.y * f };
|
|
|
|
}
|
|
|
|
|
|
|
|
typedef struct {
|
|
|
|
Point center, p0, c0, c1, p1;
|
|
|
|
color_t color0, color1;
|
|
|
|
} Patch;
|
|
|
|
|
|
|
|
static void
|
|
|
|
add_patch (cairo_pattern_t *pattern, Point *center, Patch *p)
|
|
|
|
{
|
|
|
|
cairo_mesh_pattern_begin_patch (pattern);
|
|
|
|
cairo_mesh_pattern_move_to (pattern, center->x, center->y);
|
|
|
|
cairo_mesh_pattern_line_to (pattern, p->p0.x, p->p0.y);
|
|
|
|
cairo_mesh_pattern_curve_to (pattern,
|
|
|
|
p->c0.x, p->c0.y,
|
|
|
|
p->c1.x, p->c1.y,
|
|
|
|
p->p1.x, p->p1.y);
|
|
|
|
cairo_mesh_pattern_line_to (pattern, center->x, center->y);
|
|
|
|
cairo_mesh_pattern_set_corner_color_rgba (pattern, 0,
|
|
|
|
p->color0.r,
|
|
|
|
p->color0.g,
|
|
|
|
p->color0.b,
|
|
|
|
p->color0.a);
|
|
|
|
cairo_mesh_pattern_set_corner_color_rgba (pattern, 1,
|
|
|
|
p->color0.r,
|
|
|
|
p->color0.g,
|
|
|
|
p->color0.b,
|
|
|
|
p->color0.a);
|
|
|
|
cairo_mesh_pattern_set_corner_color_rgba (pattern, 2,
|
|
|
|
p->color1.r,
|
|
|
|
p->color1.g,
|
|
|
|
p->color1.b,
|
|
|
|
p->color1.a);
|
|
|
|
cairo_mesh_pattern_set_corner_color_rgba (pattern, 3,
|
|
|
|
p->color1.r,
|
|
|
|
p->color1.g,
|
|
|
|
p->color1.b,
|
|
|
|
p->color1.a);
|
|
|
|
cairo_mesh_pattern_end_patch (pattern);
|
|
|
|
}
|
|
|
|
|
|
|
|
#define MAX_ANGLE (M_PI / 8.)
|
|
|
|
|
|
|
|
static void
|
|
|
|
add_sweep_gradient_patches1 (float cx, float cy, float radius,
|
|
|
|
float a0, color_t *c0,
|
|
|
|
float a1, color_t *c1,
|
|
|
|
cairo_pattern_t *pattern)
|
|
|
|
{
|
|
|
|
Point center = (Point) { cx, cy };
|
|
|
|
int num_splits;
|
|
|
|
Point p0;
|
|
|
|
color_t color0, color1;
|
|
|
|
|
|
|
|
num_splits = ceilf (fabs (a1 - a0) / MAX_ANGLE);
|
|
|
|
p0 = (Point) { cosf (a0), sinf (a0) };
|
|
|
|
color0 = *c0;
|
|
|
|
|
|
|
|
for (int a = 0; a < num_splits; a++)
|
|
|
|
{
|
|
|
|
float k = (a + 1.) / num_splits;
|
|
|
|
float angle1;
|
|
|
|
Point p1;
|
|
|
|
Point A, U;
|
|
|
|
Point C0, C1;
|
|
|
|
Patch patch;
|
|
|
|
|
|
|
|
angle1 = interpolate (a0, a1, k);
|
|
|
|
interpolate_colors (c0, c1, k, &color1);
|
|
|
|
|
|
|
|
patch.color0 = color0;
|
|
|
|
patch.color1 = color1;
|
|
|
|
|
|
|
|
p1 = (Point) { cosf (angle1), sinf (angle1) };
|
|
|
|
patch.p0 = sum (center, scale (p0, radius));
|
|
|
|
patch.p1 = sum (center, scale (p1, radius));
|
|
|
|
|
|
|
|
A = normalize (sum (p0, p1));
|
|
|
|
U = (Point) { -A.y, A.x };
|
|
|
|
C0 = sum (A, scale (U, dot (difference (p0, A), p0) / dot (U, p0)));
|
|
|
|
C1 = sum (A, scale (U, dot (difference (p1, A), p1) / dot (U, p1)));
|
|
|
|
|
|
|
|
patch.c0 = sum (center, scale (sum (C0, scale (difference (C0, p0), 0.33333)), radius));
|
|
|
|
patch.c1 = sum (center, scale (sum (C1, scale (difference (C1, p1), 0.33333)), radius));
|
|
|
|
|
|
|
|
add_patch (pattern, ¢er, &patch);
|
|
|
|
|
|
|
|
p0 = p1;
|
|
|
|
color0 = color1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
add_sweep_gradient_patches (hb_font_t *font,
|
|
|
|
hb_color_stop_t *stops,
|
|
|
|
unsigned int n_stops,
|
|
|
|
cairo_extend_t extend,
|
|
|
|
float cx, float cy,
|
|
|
|
float radius,
|
|
|
|
float start_angle,
|
|
|
|
float end_angle,
|
|
|
|
cairo_pattern_t *pattern)
|
|
|
|
{
|
|
|
|
hb_face_t *face = hb_font_get_face (font);
|
2022-12-19 06:07:18 +01:00
|
|
|
float angles_[PREALLOCATED_COLOR_STOPS];
|
|
|
|
float *angles = angles_;
|
|
|
|
color_t colors_[PREALLOCATED_COLOR_STOPS];
|
|
|
|
color_t *colors = colors_;
|
2022-12-18 07:52:39 +01:00
|
|
|
color_t color0, color1;
|
|
|
|
|
|
|
|
if (start_angle == end_angle)
|
|
|
|
{
|
|
|
|
if (extend == CAIRO_EXTEND_PAD)
|
|
|
|
{
|
|
|
|
color_t c;
|
|
|
|
if (start_angle > 0)
|
|
|
|
{
|
|
|
|
hb_face_get_color (face, 0, stops[0].color_index, stops[0].alpha, &c.r, &c.g, &c.b, &c.a);
|
|
|
|
add_sweep_gradient_patches1 (cx, cy, radius,
|
|
|
|
0., &c,
|
|
|
|
start_angle, &c,
|
|
|
|
pattern);
|
|
|
|
}
|
|
|
|
if (end_angle < 2 * M_PI)
|
|
|
|
{
|
|
|
|
hb_face_get_color (face, 0, stops[n_stops-1].color_index, stops[n_stops-1].alpha, &c.r, &c.g, &c.b, &c.a);
|
|
|
|
add_sweep_gradient_patches1 (cx, cy, radius,
|
|
|
|
end_angle, &c,
|
|
|
|
2 * M_PI, &c,
|
|
|
|
pattern);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
assert (start_angle != end_angle);
|
|
|
|
|
|
|
|
/* handle directions */
|
|
|
|
if (end_angle < start_angle)
|
|
|
|
{
|
|
|
|
float angle = end_angle;
|
|
|
|
end_angle = start_angle;
|
|
|
|
start_angle = angle;
|
|
|
|
|
2022-12-18 20:35:50 +01:00
|
|
|
for (unsigned i = 0; i < n_stops - 1 - i; i++)
|
2022-12-18 07:52:39 +01:00
|
|
|
{
|
|
|
|
hb_color_stop_t stop = stops[i];
|
|
|
|
stops[i] = stops[n_stops - 1 - i];
|
|
|
|
stops[n_stops - 1 - i] = stop;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2022-12-19 06:07:18 +01:00
|
|
|
if (n_stops > PREALLOCATED_COLOR_STOPS)
|
|
|
|
{
|
|
|
|
angles = (float *) malloc (sizeof (float) * n_stops);
|
|
|
|
colors = (color_t *) malloc (sizeof (color_t) * n_stops);
|
|
|
|
}
|
2022-12-18 07:52:39 +01:00
|
|
|
|
2022-12-18 20:35:50 +01:00
|
|
|
for (unsigned i = 0; i < n_stops; i++)
|
2022-12-18 07:52:39 +01:00
|
|
|
{
|
|
|
|
angles[i] = start_angle + stops[i].offset * (end_angle - start_angle);
|
|
|
|
hb_face_get_color (face, 0, stops[i].color_index, stops[i].alpha, &colors[i].r, &colors[i].g, &colors[i].b, &colors[i].a);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (extend == CAIRO_EXTEND_PAD)
|
|
|
|
{
|
2022-12-18 20:35:50 +01:00
|
|
|
unsigned pos;
|
2022-12-18 07:52:39 +01:00
|
|
|
|
|
|
|
color0 = colors[0];
|
|
|
|
for (pos = 0; pos < n_stops; pos++)
|
|
|
|
{
|
|
|
|
if (angles[pos] >= 0)
|
|
|
|
{
|
|
|
|
if (pos > 0)
|
|
|
|
{
|
|
|
|
float k = (0 - angles[pos - 1]) / (angles[pos] - angles[pos - 1]);
|
|
|
|
interpolate_colors (&colors[pos-1], &colors[pos], k, &color0);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (pos == n_stops)
|
|
|
|
{
|
|
|
|
/* everything is below 0 */
|
|
|
|
color0 = colors[n_stops-1];
|
|
|
|
add_sweep_gradient_patches1 (cx, cy, radius,
|
|
|
|
0., &color0,
|
|
|
|
2 * M_PI, &color0,
|
|
|
|
pattern);
|
2022-12-19 06:07:18 +01:00
|
|
|
goto done;
|
2022-12-18 07:52:39 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
add_sweep_gradient_patches1 (cx, cy, radius,
|
|
|
|
0., &color0,
|
|
|
|
angles[pos], &colors[pos],
|
|
|
|
pattern);
|
|
|
|
|
|
|
|
for (pos++; pos < n_stops; pos++)
|
|
|
|
{
|
|
|
|
if (angles[pos] <= 2 * M_PI)
|
|
|
|
{
|
|
|
|
add_sweep_gradient_patches1 (cx, cy, radius,
|
|
|
|
angles[pos - 1], &colors[pos-1],
|
|
|
|
angles[pos], &colors[pos],
|
|
|
|
pattern);
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
float k = (2 * M_PI - angles[pos - 1]) / (angles[pos] - angles[pos - 1]);
|
|
|
|
interpolate_colors (&colors[pos - 1], &colors[pos], k, &color1);
|
|
|
|
add_sweep_gradient_patches1 (cx, cy, radius,
|
|
|
|
angles[pos - 1], &colors[pos - 1],
|
|
|
|
2 * M_PI, &color1,
|
|
|
|
pattern);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (pos == n_stops)
|
|
|
|
{
|
|
|
|
/* everything is below 2*M_PI */
|
|
|
|
color0 = colors[n_stops - 1];
|
|
|
|
add_sweep_gradient_patches1 (cx, cy, radius,
|
|
|
|
angles[n_stops - 1], &color0,
|
|
|
|
2 * M_PI, &color0,
|
|
|
|
pattern);
|
2022-12-19 06:07:18 +01:00
|
|
|
goto done;
|
2022-12-18 07:52:39 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
int k;
|
|
|
|
float span;
|
|
|
|
|
|
|
|
span = angles[n_stops - 1] - angles[0];
|
|
|
|
k = 0;
|
|
|
|
if (angles[0] >= 0)
|
|
|
|
{
|
|
|
|
float ss = angles[0];
|
|
|
|
while (ss > 0)
|
|
|
|
{
|
|
|
|
if (span > 0)
|
|
|
|
{
|
|
|
|
ss -= span;
|
|
|
|
k--;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
ss += span;
|
|
|
|
k++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
else if (angles[0] < 0)
|
|
|
|
{
|
|
|
|
float ee = angles[n_stops - 1];
|
|
|
|
while (ee < 0)
|
|
|
|
{
|
|
|
|
if (span > 0)
|
|
|
|
{
|
|
|
|
ee += span;
|
|
|
|
k++;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
ee -= span;
|
|
|
|
k--;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
//assert (angles[0] + k * span <= 0 && 0 < angles[n_stops - 1] + k * span);
|
|
|
|
|
2022-12-18 20:35:50 +01:00
|
|
|
for (unsigned l = k; 1; l++)
|
2022-12-18 07:52:39 +01:00
|
|
|
{
|
2022-12-18 20:35:50 +01:00
|
|
|
for (unsigned i = 1; i < n_stops; i++)
|
2022-12-18 07:52:39 +01:00
|
|
|
{
|
|
|
|
float a0, a1;
|
|
|
|
color_t *c0, *c1;
|
|
|
|
|
|
|
|
if ((l % 2 != 0) && (extend == CAIRO_EXTEND_REFLECT))
|
|
|
|
{
|
|
|
|
a0 = angles[0] + angles[n_stops - 1] - angles[n_stops - 1 - (i-1)] + l * span;
|
|
|
|
a1 = angles[0] + angles[n_stops - 1] - angles[n_stops - 1 - i] + l * span;
|
|
|
|
c0 = &colors[n_stops - 1 - (i - 1)];
|
|
|
|
c1 = &colors[n_stops - 1 - i];
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
a0 = angles[i-1] + l * span;
|
|
|
|
a1 = angles[i] + l * span;
|
|
|
|
c0 = &colors[i-1];
|
|
|
|
c1 = &colors[i];
|
|
|
|
}
|
|
|
|
|
|
|
|
if (a1 < 0)
|
|
|
|
continue;
|
|
|
|
if (a0 < 0)
|
|
|
|
{
|
|
|
|
color_t color;
|
|
|
|
float f = (0 - a0)/(a1 - a0);
|
|
|
|
interpolate_colors (c0, c1, f, &color);
|
|
|
|
add_sweep_gradient_patches1 (cx, cy, radius,
|
|
|
|
0, &color,
|
|
|
|
a1, c1,
|
|
|
|
pattern);
|
|
|
|
}
|
|
|
|
else if (a1 >= 2 * M_PI)
|
|
|
|
{
|
|
|
|
color_t color;
|
|
|
|
float f = (2 * M_PI - a0)/(a1 - a0);
|
|
|
|
interpolate_colors (c0, c1, f, &color);
|
|
|
|
add_sweep_gradient_patches1 (cx, cy, radius,
|
|
|
|
a0, c0,
|
|
|
|
2 * M_PI, &color,
|
|
|
|
pattern);
|
|
|
|
goto done;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
add_sweep_gradient_patches1 (cx, cy, radius,
|
|
|
|
a0, c0,
|
|
|
|
a1, c1,
|
|
|
|
pattern);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2022-12-19 06:07:18 +01:00
|
|
|
|
|
|
|
done:
|
|
|
|
|
|
|
|
if (angles != angles_)
|
|
|
|
free (angles);
|
|
|
|
if (colors != colors_)
|
|
|
|
free (colors);
|
2022-12-18 07:52:39 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
hb_cairo_paint_sweep_gradient (cairo_t *cr,
|
|
|
|
hb_font_t *font,
|
|
|
|
hb_color_line_t *color_line,
|
|
|
|
float cx, float cy,
|
|
|
|
float start_angle,
|
|
|
|
float end_angle)
|
|
|
|
{
|
|
|
|
unsigned int len;
|
2022-12-19 06:07:18 +01:00
|
|
|
hb_color_stop_t stops_[PREALLOCATED_COLOR_STOPS];
|
|
|
|
hb_color_stop_t *stops = stops_;
|
2022-12-18 07:52:39 +01:00
|
|
|
cairo_extend_t extend;
|
|
|
|
double x1, y1, x2, y2;
|
|
|
|
float max_x, max_y, radius;
|
|
|
|
cairo_pattern_t *pattern;
|
|
|
|
|
|
|
|
len = hb_color_line_get_color_stops (color_line, 0, NULL, NULL);
|
2022-12-19 06:07:18 +01:00
|
|
|
if (len > PREALLOCATED_COLOR_STOPS)
|
|
|
|
stops = (hb_color_stop_t *) malloc (len * sizeof (hb_color_stop_t));
|
2022-12-18 07:52:39 +01:00
|
|
|
hb_color_line_get_color_stops (color_line, 0, &len, stops);
|
2022-12-19 06:07:18 +01:00
|
|
|
|
2022-12-18 07:52:39 +01:00
|
|
|
qsort (stops, len, sizeof (hb_color_stop_t), cmp_color_stop);
|
|
|
|
|
|
|
|
cairo_clip_extents (cr, &x1, &y1, &x2, &y2);
|
|
|
|
max_x = MAX ((x1 - cx) * (x1 - cx), (x2 - cx) * (x2 - cx));
|
|
|
|
max_y = MAX ((y1 - cy) * (y1 - cy), (y2 - cy) * (y2 - cy));
|
|
|
|
radius = sqrt (max_x + max_y);
|
|
|
|
|
|
|
|
extend = cairo_extend (hb_color_line_get_extend (color_line));
|
|
|
|
pattern = cairo_pattern_create_mesh ();
|
|
|
|
|
|
|
|
add_sweep_gradient_patches (font, stops, len, extend, cx, cy,
|
|
|
|
radius, start_angle, end_angle, pattern);
|
|
|
|
|
|
|
|
cairo_set_source (cr, pattern);
|
|
|
|
cairo_paint (cr);
|
|
|
|
|
|
|
|
cairo_pattern_destroy (pattern);
|
2022-12-19 06:07:18 +01:00
|
|
|
|
|
|
|
if (stops != stops_)
|
|
|
|
free (stops);
|
2022-12-18 07:52:39 +01:00
|
|
|
}
|