From 794fa4c3c1d6564477a0885b95f80409f9272090 Mon Sep 17 00:00:00 2001 From: Matthias Clasen Date: Thu, 15 Dec 2022 22:22:31 -0500 Subject: [PATCH] sweep gradients etc --- util/hb-test.c | 819 ++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 817 insertions(+), 2 deletions(-) diff --git a/util/hb-test.c b/util/hb-test.c index b03c08389..b6024d215 100644 --- a/util/hb-test.c +++ b/util/hb-test.c @@ -1,10 +1,33 @@ #include +#include #include #include #include +#include +#include +#include +#include + +#ifndef MIN +#define MIN(x,y) ((x) < (y) ? (x) : (y)) +#endif + +#ifndef MAX +#define MAX(x,y) ((x) > (y) ? (x) : (y)) +#endif + +#ifndef FALSE +#define FALSE 0 +#define TRUE 1 +#endif typedef struct { int level; + cairo_t *cr; + hb_font_t *font; + hb_color_t *colors; + unsigned int num_colors; + hb_color_t foreground_color; } paint_data_t; #define INDENT 2 @@ -25,6 +48,82 @@ print (paint_data_t *data, printf ("\n"); } +typedef struct { + float r, g, b, a; +} color_t; + +static void +get_color (paint_data_t *data, + unsigned int color_index, + float alpha, + color_t *c) +{ + hb_color_t color; + + if (color_index == 0xffff) + color = data->foreground_color; + else + color = data->colors[color_index]; + + c->r = hb_color_get_red (color) / 255.; + c->g = hb_color_get_green (color) / 255.; + c->b = hb_color_get_blue (color) / 255.; + c->a = (hb_color_get_alpha (color) / 255.) * alpha; +} + +static cairo_operator_t +to_operator (hb_paint_composite_mode_t mode) +{ + switch (mode) + { + case HB_PAINT_COMPOSITE_MODE_CLEAR: return CAIRO_OPERATOR_CLEAR; + case HB_PAINT_COMPOSITE_MODE_SRC: return CAIRO_OPERATOR_SOURCE; + case HB_PAINT_COMPOSITE_MODE_DEST: return CAIRO_OPERATOR_DEST; + case HB_PAINT_COMPOSITE_MODE_SRC_OVER: return CAIRO_OPERATOR_OVER; + case HB_PAINT_COMPOSITE_MODE_DEST_OVER: return CAIRO_OPERATOR_DEST_OVER; + case HB_PAINT_COMPOSITE_MODE_SRC_IN: return CAIRO_OPERATOR_IN; + case HB_PAINT_COMPOSITE_MODE_DEST_IN: return CAIRO_OPERATOR_DEST_IN; + case HB_PAINT_COMPOSITE_MODE_SRC_OUT: return CAIRO_OPERATOR_OUT; + case HB_PAINT_COMPOSITE_MODE_DEST_OUT: return CAIRO_OPERATOR_DEST_OUT; + case HB_PAINT_COMPOSITE_MODE_SRC_ATOP: return CAIRO_OPERATOR_ATOP; + case HB_PAINT_COMPOSITE_MODE_DEST_ATOP: return CAIRO_OPERATOR_DEST_ATOP; + case HB_PAINT_COMPOSITE_MODE_XOR: return CAIRO_OPERATOR_XOR; + case HB_PAINT_COMPOSITE_MODE_PLUS: return CAIRO_OPERATOR_ADD; + case HB_PAINT_COMPOSITE_MODE_SCREEN: return CAIRO_OPERATOR_SCREEN; + case HB_PAINT_COMPOSITE_MODE_OVERLAY: return CAIRO_OPERATOR_OVERLAY; + case HB_PAINT_COMPOSITE_MODE_DARKEN: return CAIRO_OPERATOR_DARKEN; + case HB_PAINT_COMPOSITE_MODE_LIGHTEN: return CAIRO_OPERATOR_LIGHTEN; + case HB_PAINT_COMPOSITE_MODE_COLOR_DODGE: return CAIRO_OPERATOR_COLOR_DODGE; + case HB_PAINT_COMPOSITE_MODE_COLOR_BURN: return CAIRO_OPERATOR_COLOR_BURN; + case HB_PAINT_COMPOSITE_MODE_HARD_LIGHT: return CAIRO_OPERATOR_HARD_LIGHT; + case HB_PAINT_COMPOSITE_MODE_SOFT_LIGHT: return CAIRO_OPERATOR_SOFT_LIGHT; + case HB_PAINT_COMPOSITE_MODE_DIFFERENCE: return CAIRO_OPERATOR_DIFFERENCE; + case HB_PAINT_COMPOSITE_MODE_EXCLUSION: return CAIRO_OPERATOR_EXCLUSION; + case HB_PAINT_COMPOSITE_MODE_MULTIPLY: return CAIRO_OPERATOR_MULTIPLY; + case HB_PAINT_COMPOSITE_MODE_HSL_HUE: return CAIRO_OPERATOR_HSL_HUE; + case HB_PAINT_COMPOSITE_MODE_HSL_SATURATION: return CAIRO_OPERATOR_HSL_SATURATION; + case HB_PAINT_COMPOSITE_MODE_HSL_COLOR: return CAIRO_OPERATOR_HSL_COLOR; + case HB_PAINT_COMPOSITE_MODE_HSL_LUMINOSITY: return CAIRO_OPERATOR_HSL_LUMINOSITY; + default:; + } + + return CAIRO_OPERATOR_SOURCE; +} + +static cairo_extend_t +cairo_extend (hb_paint_extend_t extend) +{ + switch (extend) + { + case HB_PAINT_EXTEND_PAD: return CAIRO_EXTEND_PAD; + case HB_PAINT_EXTEND_REPEAT: return CAIRO_EXTEND_REPEAT; + case HB_PAINT_EXTEND_REFLECT: return CAIRO_EXTEND_REFLECT; + default:; + } + + return CAIRO_EXTEND_PAD; +} + static void push_transform (hb_paint_funcs_t *funcs, void *paint_data, @@ -34,7 +133,14 @@ push_transform (hb_paint_funcs_t *funcs, void *user_data) { paint_data_t *data = user_data; + cairo_matrix_t m; + print (data, "start transform %f %f %f %f %f %f", xx, yx, xy, yy, dx, dy); + + cairo_save (data->cr); + cairo_matrix_init (&m, xx, yx, xy, yy, dx, dy); + cairo_transform (data->cr, &m); + data->level++; } @@ -44,10 +150,59 @@ pop_transform (hb_paint_funcs_t *funcs, void *user_data) { paint_data_t *data = user_data; + data->level--; + + cairo_restore (data->cr); + print (data, "end transform"); } +static void +move_to (hb_draw_funcs_t *funcs, void *draw_data, + hb_draw_state_t *st, + float x, float y, + void *user_data) +{ + paint_data_t *data = user_data; + + cairo_move_to (data->cr, x, y); +} + +static void +line_to (hb_draw_funcs_t *funcs, void *draw_data, + hb_draw_state_t *st, + float x, float y, + void *user_data) +{ + paint_data_t *data = user_data; + + cairo_line_to (data->cr, x, y); +} + +static void +cubic_to (hb_draw_funcs_t *funcs, void *draw_data, + hb_draw_state_t *st, + float c1x, float c1y, + float c2x, float c2y, + float x, float y, + void *user_data) +{ + paint_data_t *data = user_data; + + cairo_curve_to (data->cr, c1x, c1y, c2x, c2y, x, y); +} + +static void +close_path (hb_draw_funcs_t *funcs, void *draw_data, + hb_draw_state_t *st, + void *user_data) +{ + paint_data_t *data = user_data; + + cairo_close_path (data->cr); +} + static void push_clip_glyph (hb_paint_funcs_t *funcs, void *paint_data, @@ -55,8 +210,26 @@ push_clip_glyph (hb_paint_funcs_t *funcs, void *user_data) { paint_data_t *data = user_data; + hb_draw_funcs_t *dfuncs; print (data, "start clip glyph %u", glyph); data->level++; + + cairo_save (data->cr); + + dfuncs = hb_draw_funcs_create (); + hb_draw_funcs_set_move_to_func (dfuncs, move_to, data, NULL); + hb_draw_funcs_set_line_to_func (dfuncs, line_to, data, NULL); + hb_draw_funcs_set_cubic_to_func (dfuncs, cubic_to, data, NULL); + hb_draw_funcs_set_close_path_func (dfuncs, close_path, data, NULL); + + cairo_new_path (data->cr); + + hb_font_get_glyph_shape (data->font, glyph, dfuncs, data); + cairo_close_path (data->cr); + + cairo_clip (data->cr); + + hb_draw_funcs_destroy (dfuncs); } static void @@ -66,8 +239,15 @@ push_clip_rect (hb_paint_funcs_t *funcs, void *user_data) { paint_data_t *data = user_data; + print (data, "start clip rect %f %f %f %f", xmin, ymin, xmax, ymax); data->level++; + + cairo_save (data->cr); + + cairo_rectangle (data->cr, xmin, ymin, xmax - xmin, ymax - ymin); + + cairo_clip (data->cr); } static void @@ -76,6 +256,9 @@ pop_clip (hb_paint_funcs_t *funcs, void *user_data) { paint_data_t *data = user_data; + + cairo_restore (data->cr); + data->level--; print (data, "end clip"); } @@ -88,7 +271,86 @@ solid (hb_paint_funcs_t *funcs, void *user_data) { paint_data_t *data = user_data; + color_t c; + print (data, "solid %u %f", color_index, alpha); + + get_color (data, color_index, alpha, &c); + cairo_set_source_rgba (data->cr, c.r, c.g, c.b, c.a); + cairo_paint (data->cr); +} + +static void +reduce_anchors (float x0, float y0, + float x1, float y1, + float x2, float y2, + float *xx0, float *yy0, + float *xx1, float *yy1) +{ + float q1x, q1y, q2x, q2y; + float s; + float k; + + q2x = x2 - x0; + q2y = y2 - y0; + q1x = y1 - x0; + q1y = y1 - y0; + + s = q2x * q2x + q2y * q2y; + if (s < 0.000001) + { + *xx0 = x0; *yy0 = y0; + *xx1 = x1; *yy1 = y1; + return; + } + + k = (q2x * q1x + q2y * q1y) / s; + *xx0 = x0; + *yy0 = y0; + *xx1 = x1 - k * q2x; + *yy1 = y1 - k * q2y; +} + +static int +cmp_color_stop (const void *p1, + const void *p2) +{ + const hb_color_stop_t *c1 = p1; + const hb_color_stop_t *c2 = p2; + + if (c1->offset < c2->offset) + return -1; + else if (c1->offset > c2->offset) + return 1; + else + return 0; +} + +static void +normalize_color_line (hb_color_stop_t *stops, + unsigned int len, + float *omin, + float *omax) +{ + float min, max; + + qsort (stops, len, sizeof (hb_color_stop_t), cmp_color_stop); + + min = max = stops[0].offset; + for (unsigned int i = 0; i < len; i++) + { + min = MIN (min, stops[i].offset); + max = MAX (max, stops[i].offset); + } + + if (min != max) + { + for (unsigned int i = 0; i < len; i++) + stops[i].offset = (stops[i].offset - min) / (max - min); + } + + *omin = min; + *omax = max; } static void @@ -103,6 +365,10 @@ linear_gradient (hb_paint_funcs_t *funcs, paint_data_t *data = user_data; unsigned int len; hb_color_stop_t *stops; + float xx0, yy0, xx1, yy1; + float xxx0, yyy0, xxx1, yyy1; + float min, max; + cairo_pattern_t *pattern; len = hb_color_line_get_color_stops (color_line, 0, NULL, NULL); stops = alloca (len * sizeof (hb_color_stop_t)); @@ -118,6 +384,28 @@ linear_gradient (hb_paint_funcs_t *funcs, for (unsigned int i = 0; i < len; i++) print (data, "%f %u %f", stops[i].offset, stops[i].color_index, stops[i].alpha); data->level -= 2; + + reduce_anchors (x0, y0, x1, y1, x2, y2, &xx0, &yy0, &xx1, &yy1); + normalize_color_line (stops, len, &min, &max); + + xxx0 = xx0 + min * (xx1 - xx0); + yyy0 = yy0 + min * (yy1 - yy0); + xxx1 = xx0 + max * (xx1 - xx0); + yyy1 = yy0 + max * (yy1 - yy0); + + pattern = cairo_pattern_create_linear (xxx0, yyy0, xxx1, yyy1); + cairo_pattern_set_extend (pattern, cairo_extend (hb_color_line_get_extend (color_line))); + for (unsigned int i = 0; i < len; i++) + { + color_t c; + get_color (data, stops[i].color_index, stops[i].alpha, &c); + cairo_pattern_add_color_stop_rgba (pattern, stops[i].offset, c.r, c.g, c.b, c.a); + } + + cairo_set_source (data->cr, pattern); + cairo_paint (data->cr); + + cairo_pattern_destroy (pattern); } static void @@ -129,20 +417,478 @@ radial_gradient (hb_paint_funcs_t *funcs, void *user_data) { paint_data_t *data = user_data; + unsigned int len; + hb_color_stop_t *stops; + cairo_extend_t extend; + float min, max; + float xx0, yy0, xx1, yy1; + float rr0, rr1; + cairo_pattern_t *pattern; + print (data, "radial gradient"); + + len = hb_color_line_get_color_stops (color_line, 0, NULL, NULL); + stops = alloca (len * sizeof (hb_color_stop_t)); + hb_color_line_get_color_stops (color_line, 0, &len, stops); + + extend = cairo_extend (hb_color_line_get_extend (color_line)); + + normalize_color_line (stops, len, &min, &max); + xx0 = x0 + min * (x1 - x0); + yy0 = y0 + min * (y1 - y0); + xx1 = x0 + max * (x1 - x0); + yy1 = y0 + max * (y1 - y0); + rr0 = r0 + min * (r1 - r0); + rr1 = r0 + max * (r1 - r0); + + pattern = cairo_pattern_create_radial (xx0, yy0, rr0, xx1, yy1, rr1); + cairo_pattern_set_extend (pattern, extend); + + for (unsigned int i = 0; i < len; i++) + { + color_t c; + + get_color (data, stops[i].color_index, stops[i].alpha, &c); + cairo_pattern_add_color_stop_rgba (pattern, stops[i].offset, c.r, c.g, c.b, c.a); + } + + cairo_set_source (data->cr, pattern); + cairo_paint (data->cr); + + cairo_pattern_destroy (pattern); +} + +typedef struct { + float x, y; +} Point; + +static inline float +interpolate (float f0, float f1, float f) +{ + return f0 + f * (f1 - f0); +} + +static inline void +interpolate_points (Point *p0, Point *p1, float f, Point *out) +{ + out->x = interpolate (p0->x, p1->x, f); + out->y = interpolate (p0->y, p1->y, f); +} + +void +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 (paint_data_t *data, + 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) +{ + float *angles; + color_t *colors; + color_t color0, color1; + + if (start_angle == end_angle) + { + if (extend == CAIRO_EXTEND_PAD) + { + color_t c; + if (start_angle > 0) + { + get_color (data, stops[0].color_index, stops[0].alpha, &c); + add_sweep_gradient_patches1 (cx, cy, radius, + 0., &c, + start_angle, &c, + pattern); + } + if (end_angle < 2 * M_PI) + { + get_color (data, stops[n_stops - 1].color_index, stops[n_stops - 1].alpha, &c); + 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; + + for (int i = 0; i < n_stops - 1 - i; i++) + { + hb_color_stop_t stop = stops[i]; + stops[i] = stops[n_stops - 1 - i]; + stops[n_stops - 1 - i] = stop; + } + } + + angles = alloca (sizeof (float) * n_stops); + colors = alloca (sizeof (color_t) * n_stops); + + for (int i = 0; i < n_stops; i++) + { + angles[i] = start_angle + stops[i].offset * (end_angle - start_angle); + get_color (data, stops[i].color_index, stops[i].alpha, &colors[i]); + } + + if (extend == CAIRO_EXTEND_PAD) + { + int pos; + + 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); + return; + } + + 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); + return; + } + } + 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); + + for (int l = k; TRUE; l++) + { + for (int i = 1; i < n_stops; i++) + { + 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); + } + } + } +done: + } } static void sweep_gradient (hb_paint_funcs_t *funcs, void *paint_data, hb_color_line_t *color_line, - float x0, float y0, + float cx, float cy, float start_angle, float end_angle, void *user_data) { paint_data_t *data = user_data; + unsigned int len; + hb_color_stop_t *stops; + 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); + stops = alloca (len * sizeof (hb_color_stop_t)); + hb_color_line_get_color_stops (color_line, 0, &len, stops); + qsort (stops, len, sizeof (hb_color_stop_t), cmp_color_stop); + print (data, "sweep gradient"); + data->level++; + print (data, "center %f %f", cx, cy); + print (data, "angles %f %f", start_angle, end_angle); + + data->level += 1; + for (unsigned int i = 0; i < len; i++) + print (data, "%f %u %f", stops[i].offset, stops[i].color_index, stops[i].alpha); + data->level -= 2; + + cairo_clip_extents (data->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 (data, stops, len, extend, cx, cy, + radius, start_angle, end_angle, pattern); + + cairo_set_source (data->cr, pattern); + cairo_paint (data->cr); + + cairo_pattern_destroy (pattern); + + data->level--; } static void @@ -153,6 +899,9 @@ push_group (hb_paint_funcs_t *funcs, paint_data_t *data = user_data; print (data, "push group"); data->level++; + + cairo_save (data->cr); + cairo_push_group (data->cr); } static void @@ -162,19 +911,64 @@ pop_group (hb_paint_funcs_t *funcs, void *user_data) { paint_data_t *data = user_data; + + cairo_pop_group_to_source (data->cr); + cairo_set_operator (data->cr, to_operator (mode)); + cairo_paint (data->cr); + + cairo_restore (data->cr); + data->level--; print (data, "pop group mode %d", mode); } int main (int argc, char *argv[]) { - paint_data_t data = { 0 }; + paint_data_t data; hb_paint_funcs_t *funcs; hb_blob_t *blob = hb_blob_create_from_file (argv[1]); hb_face_t *face = hb_face_create (blob, 0); hb_font_t *font = hb_font_create (face); hb_font_set_scale (font, 20, 20); hb_codepoint_t gid = atoi (argv[2]); + hb_glyph_extents_t extents; + cairo_surface_t *surface; + cairo_pattern_t *pattern; + cairo_matrix_t m; + float xmin, ymin, xmax, ymax; + + float size = 120.; + int upem = hb_face_get_upem (hb_font_get_face (font)); + + hb_font_set_scale (font, size, size); + hb_font_get_glyph_extents (font, gid, &extents); + hb_font_set_scale (font, upem, upem); + + xmin = extents.x_bearing; + xmax = xmin + extents.width; + ymin = - extents.y_bearing; + ymax = - extents.y_bearing - extents.height; + + printf ("surface %f %f, offset %f %f\n", ceil (xmax - xmin), ceil (ymax - ymin), - xmin, - ymin); + + surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, + (int) ceil (xmax - xmin), + (int) ceil (ymax - ymin)); + + cairo_surface_set_device_offset (surface, - xmin, ymax); + + data.level = 0; + data.cr = cairo_create (surface); + cairo_push_group (data.cr); + + data.font = font; + data.foreground_color = HB_COLOR (0, 0, 0, 255); + + data.num_colors = hb_ot_color_palette_get_colors (hb_font_get_face (font), + 0, 0, NULL, NULL); + data.colors = alloca (data.num_colors * sizeof (hb_color_t)); + hb_ot_color_palette_get_colors (hb_font_get_face (font), + 0, 0, &data.num_colors, data.colors); funcs = hb_paint_funcs_create (); hb_paint_funcs_set_push_transform_func (funcs, push_transform, &data, NULL); @@ -189,7 +983,28 @@ int main (int argc, char *argv[]) hb_paint_funcs_set_radial_gradient_func (funcs, radial_gradient, &data, NULL); hb_paint_funcs_set_sweep_gradient_func (funcs, sweep_gradient, &data, NULL); + cairo_save (data.cr); + cairo_scale (data.cr, size/upem, size/upem); // root transform + hb_font_paint_glyph (font, gid, funcs, NULL); + cairo_restore (data.cr); + + pattern = cairo_pop_group (data.cr); + + cairo_matrix_init_scale (&m, 1, -1); + cairo_matrix_translate (&m, 0, (ymax - ymin) + 2 * ymin); + cairo_pattern_set_matrix (pattern, &m); + cairo_set_source (data.cr, pattern); + + cairo_paint (data.cr); + + cairo_surface_set_device_offset (surface, - xmin, - ymin); + + printf ("writing glyph.png\n"); + cairo_surface_write_to_png (surface, "glyph.png"); + + execvp ("eog", (char *const[]) { "eog", "glyph.png", NULL }); + return 0; }