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Debug spew 

To get a dump of the hb-paint callbacks,
set HB_PAINT_DEBUG=1 when running hb-view.

For now, leave this code in place, since it
comes in handy for various debugging.
This commit is contained in:
Matthias Clasen 2022-12-23 13:32:31 -05:00 committed by Behdad Esfahbod
parent 583f010b05
commit ecd7420456
1 changed files with 126 additions and 5 deletions
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131
util/helper-cairo-user.hh
View File

@ -37,6 +37,27 @@
#include "hb-blob.hh"
#include "hb-cairo-utils.h"
static bool debug = false;
static int level = 0;
static void
print (const char *format,
...)
{
va_list args;
if (!debug)
return;
printf ("%*s", 2 * level, "");
va_start (args, format);
vprintf (format, args);
va_end (args);
printf ("\n");
}
static const cairo_user_data_key_t _hb_font_cairo_user_data_key = {0};
static void
@ -46,6 +67,8 @@ move_to (hb_draw_funcs_t *dfuncs,
float to_x, float to_y,
void *)
{
print ("move to %f %f",
(double) to_x, (double) to_y);
cairo_move_to (cr,
(double) to_x, (double) to_y);
}
@ -57,6 +80,8 @@ line_to (hb_draw_funcs_t *dfuncs,
float to_x, float to_y,
void *)
{
print ("line to %f %f",
(double) to_x, (double) to_y);
cairo_line_to (cr,
(double) to_x, (double) to_y);
}
@ -70,6 +95,10 @@ cubic_to (hb_draw_funcs_t *dfuncs,
float to_x, float to_y,
void *)
{
print ("cubic to %f %f",
(double) control1_x, (double) control1_y,
(double) control2_x, (double) control2_y,
(double) to_x, (double) to_y);
cairo_curve_to (cr,
(double) control1_x, (double) control1_y,
(double) control2_x, (double) control2_y,
@ -82,6 +111,7 @@ close_path (hb_draw_funcs_t *dfuncs,
hb_draw_state_t *st,
void *)
{
print ("close path");
cairo_close_path (cr);
}
@ -116,10 +146,16 @@ push_transform (hb_paint_funcs_t *funcs,
cairo_t *cr = (cairo_t *)paint_data;
cairo_matrix_t m;
print ("start transform %f %f %f %f %f %f",
(double) xx, (double) yx,
(double) xy, (double) yy,
(double) dx, (double) dy);
level++;
cairo_save (cr);
cairo_matrix_init (&m, (double)xx, (double)yx,
(double)xy, (double)yy,
(double)dx, (double)dy);
cairo_matrix_init (&m, (double) xx, (double) yx,
(double) xy, (double) yy,
(double) dx, (double) dy);
cairo_transform (cr, &m);
}
@ -131,6 +167,9 @@ pop_transform (hb_paint_funcs_t *funcs,
cairo_t *cr = (cairo_t *)paint_data;
cairo_restore (cr);
level--;
print ("end transform");
}
static void
@ -142,6 +181,9 @@ push_clip_glyph (hb_paint_funcs_t *funcs,
{
cairo_t *cr = (cairo_t *)paint_data;
print ("start clip glyph %u", glyph);
level++;
cairo_save (cr);
cairo_new_path (cr);
hb_font_draw_glyph (font, glyph, get_cairo_draw_funcs (), cr);
@ -157,10 +199,15 @@ push_clip_rectangle (hb_paint_funcs_t *funcs,
{
cairo_t *cr = (cairo_t *)paint_data;
print ("start clip rectangle %f %f %f %f",
(double) xmin, (double) ymin,
(double) xmax, (double) ymax);
level++;
cairo_save (cr);
cairo_rectangle (cr,
(double)xmin, (double)ymin,
(double)(xmax - xmin), (double)(ymax - ymin));
(double) xmin, (double) ymin,
(double) (xmax - xmin), (double) (ymax - ymin));
cairo_clip (cr);
}
@ -172,6 +219,9 @@ pop_clip (hb_paint_funcs_t *funcs,
cairo_t *cr = (cairo_t *)paint_data;
cairo_restore (cr);
level--;
print ("end clip");
}
static void
@ -181,6 +231,9 @@ push_group (hb_paint_funcs_t *funcs,
{
cairo_t *cr = (cairo_t *)paint_data;
print ("push group");
level++;
cairo_save (cr);
cairo_push_group (cr);
}
@ -198,6 +251,9 @@ pop_group (hb_paint_funcs_t *funcs,
cairo_paint (cr);
cairo_restore (cr);
level--;
print ("pop group mode %d", mode);
}
static void
@ -209,6 +265,13 @@ paint_color (hb_paint_funcs_t *funcs,
{
cairo_t *cr = (cairo_t *)paint_data;
print ("solid (fg %d) %d %d %d %d",
use_foreground,
hb_color_get_red (color),
hb_color_get_green (color),
hb_color_get_blue (color),
hb_color_get_alpha (color));
cairo_set_source_rgba (cr,
hb_color_get_red (color) / 255.,
hb_color_get_green (color) / 255.,
@ -230,9 +293,39 @@ paint_image (hb_paint_funcs_t *funcs,
{
cairo_t *cr = (cairo_t *)paint_data;
char buf[5] = { 0, };
hb_tag_to_string (format, buf);
print ("image type %s size %u %u slant %f extents %d %d %d %d\n",
buf, width, height, (double) slant,
extents->x_bearing, extents->y_bearing, extents->width, extents->height);
hb_cairo_paint_glyph_image (cr, blob, width, height, format, slant, extents);
}
static void
print_color_line (hb_color_line_t *color_line)
{
hb_color_stop_t *stops;
unsigned int len;
len = hb_color_line_get_color_stops (color_line, 0, NULL, NULL);
stops = (hb_color_stop_t *)alloca (len * sizeof (hb_color_stop_t));
hb_color_line_get_color_stops (color_line, 0, &len, stops);
print ("colors extend %d", hb_color_line_get_extend (color_line));
level += 1;
for (unsigned int i = 0; i < len; i++)
print ("%f (fg %d) %d %d %d %d",
(double) stops[i].offset,
stops[i].is_foreground,
hb_color_get_red (stops[i].color),
hb_color_get_green (stops[i].color),
hb_color_get_blue (stops[i].color),
hb_color_get_alpha (stops[i].color));
level -= 1;
}
static void
paint_linear_gradient (hb_paint_funcs_t *funcs,
void *paint_data,
@ -244,6 +337,15 @@ paint_linear_gradient (hb_paint_funcs_t *funcs,
{
cairo_t *cr = (cairo_t *)paint_data;
print ("linear gradient");
level += 1;
print ("p0 %f %f", (double) x0, (double) y0);
print ("p1 %f %f", (double) x1, (double) y1);
print ("p2 %f %f", (double) x2, (double) y2);
print_color_line (color_line);
level -= 1;
hb_cairo_paint_linear_gradient (cr, color_line, x0, y0, x1, y1, x2, y2);
}
@ -257,6 +359,14 @@ paint_radial_gradient (hb_paint_funcs_t *funcs,
{
cairo_t *cr = (cairo_t *)paint_data;
print ("radial gradient");
level += 1;
print ("p0 %f %f radius %f", (double) x0, (double) y0, (double) r0);
print ("p1 %f %f radius %f", (double) x1, (double) y1, (double) r1);
print_color_line (color_line);
level -= 1;
hb_cairo_paint_radial_gradient (cr, color_line, x0, y0, r0, x1, y1, r1);
}
@ -270,6 +380,14 @@ paint_sweep_gradient (hb_paint_funcs_t *funcs,
{
cairo_t *cr = (cairo_t *)paint_data;
print ("sweep gradient");
level++;
print ("center %f %f", (double) x0, (double) y0);
print ("angles %f %f", (double) start_angle, (double) end_angle);
print_color_line (color_line);
level--;
hb_cairo_paint_sweep_gradient (cr, color_line, x0, y0, start_angle, end_angle);
}
@ -366,6 +484,9 @@ render_color_glyph (cairo_scaled_font_t *scaled_font,
hb_font_get_scale (font, &x_scale, &y_scale);
cairo_scale (cr, +1./x_scale, -1./y_scale);
if (getenv ("HB_PAINT_DEBUG"))
debug = atoi (getenv ("HB_PAINT_DEBUG"));
hb_font_paint_glyph (font, glyph, get_cairo_paint_funcs (), cr, palette, color);
hb_glyph_extents_t hb_extents;