hjsc
/
hvif-light
1
0
Fork 0
Code Releases 1 Activity

Work on gradients: linear and radial 

- Color space is wrong
- No proper error handling
This commit is contained in:
Hans-Joerg Schurr 2020-04-23 00:43:10 +02:00
parent 69229b956f
commit bd8bb0065d
1 changed files with 92 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

95
src/hvif-cairo.c
View File

@ -1,6 +1,7 @@
#include "hvif-light.h"
#include <stdint.h>
#include <stdlib.h>
#include <assert.h>
#include <cairo.h>
@ -14,6 +15,26 @@
* 3. Put everything together
*/
/* TODO: Gradients
* - Check the various forms
* - How is the gradient oriented in the picture
* - Apply transformation matrix
* - Color space
*/
void
cairo_matrix_init_from_matrix(cairo_matrix_t* matrix, const hvif_matrix* hvif_matrix)
{
cairo_matrix_init(matrix,
hvif_matrix->xx,
hvif_matrix->yx,
hvif_matrix->xy,
hvif_matrix->yy,
hvif_matrix->x0,
hvif_matrix->y0
);
}
void
create_path(cairo_t* cr, hvif_path* path)
{
@ -23,26 +44,93 @@ create_path(cairo_t* cr, hvif_path* path)
hvif_point p = path->points[3 * i];
hvif_point cp1 = path->points[3 * i + 1];
hvif_point cp2 = path->points[3 * i + 2];
cairo_curve_to(cr, cp1.x, cp1.y, cp2.x, cp2.y, p.x, p.y);
uint8_t command = path_command_at(path, i);
if (command == PATH_COMMAND_CURVE)
cairo_curve_to(cr, cp1.x, cp1.y, cp2.x, cp2.y, p.x, p.y);
else
cairo_line_to(cr, p.x, p.y);
}
if (path->closed)
cairo_close_path(cr);
}
void
create_style(cairo_t* cr, hvif_style* style)
{
assert(style->num_stops > 0);
cairo_pattern_t *pat;
switch (style->gradient_type) {
case GRADIENT_LINEAR:
printf("GRADIENT_LINEAR\n");
pat = cairo_pattern_create_linear(-64, 32, 64, 32);
break;
case GRADIENT_CIRCULAR:
printf("GRADIENT_CIRCULAR\n");
pat = cairo_pattern_create_radial(0, 0, 0, 0, 0, 64);
break;
case GRADIENT_DIAMOND:
printf("GRADIENT_DIAMOND\n");
assert(false);
break;
case GRADIENT_CONIC:
printf("GRADIENT_CONIC\n");
assert(false);
break;
case GRADIENT_XY:
printf("GRADIENT_XY\n");
assert(false);
break;
case GRADIENT_SQRT_XY:
printf("GRADIENT_SQRT_XY\n");
assert(false);
break;
}
for (unsigned i = 0; i < style->num_stops; ++i) {
printf("stop %f\n", style->offsets[i]);
hvif_color c = style->colors[i];
cairo_pattern_add_color_stop_rgba(pat, style->offsets[i],
COLOR_GET_RED(c) / 255.0,
COLOR_GET_GREEN(c) / 255.0,
COLOR_GET_BLUE(c) / 255.0,
COLOR_GET_ALPHA(c) / 255.0);
}
cairo_matrix_t transformation;
cairo_matrix_init_from_matrix(&transformation, &style->transformation);
if (cairo_matrix_invert(&transformation) != CAIRO_STATUS_SUCCESS) {
printf("could not invert style transformation\n");
exit(1);
}
cairo_pattern_set_matrix(pat, &transformation);
cairo_rectangle(cr, 0, 0, 64, 64);
cairo_set_source(cr, pat);
cairo_fill(cr);
cairo_pattern_destroy(pat);
}
bool
hvif_render_image(const char* filename, hvif_image* image)
{
cairo_surface_t* surface =
cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 254, 254);
/* cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 254, 254); */
cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 65, 64);
cairo_t* cr = cairo_create(surface);
cairo_scale(cr, 4.0, 4.0);
/* cairo_scale(cr, 4.0, 4.0); */
cairo_scale(cr, 1.0, 1.0);
cairo_set_line_width(cr, 0.2);
double r = 0;
double delta = 1.0 / image->num_shapes;
printf("styles %u\n", image->num_styles);
create_style(cr, &image->styles[0]);
/*
for (unsigned i = 0; i < image->num_shapes; ++i) {
cairo_set_source_rgb(cr, r, 0, 0);
r = r + delta;
@ -57,6 +145,7 @@ hvif_render_image(const char* filename, hvif_image* image)
cairo_stroke(cr);
}
}
*/
cairo_destroy(cr);