158 lines
3.6 KiB
C
158 lines
3.6 KiB
C
#include "hvif-light.h"
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#include <stdint.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <cairo.h>
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#define INTERNAL_DATASTRUCTURES
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#include "hvif-light.c"
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#undef INTERNAL_DATASTRUCTURES
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/* TODO:
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* 1. Draw the path in each shape as outline
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* 2. Then do the same for the styles
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* 3. Put everything together
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*/
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/* TODO: Gradients
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* - Check the various forms
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* - How is the gradient oriented in the picture
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* - Apply transformation matrix
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* - Color space
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*/
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void
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cairo_matrix_init_from_matrix(cairo_matrix_t* matrix, const hvif_matrix* hvif_matrix)
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{
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cairo_matrix_init(matrix,
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hvif_matrix->xx,
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hvif_matrix->yx,
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hvif_matrix->xy,
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hvif_matrix->yy,
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hvif_matrix->x0,
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hvif_matrix->y0
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);
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}
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void
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create_path(cairo_t* cr, hvif_path* path)
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{
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assert(path->num_points > 0);
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for (unsigned i = 0; i < path->num_points; ++i) {
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hvif_point p = path->points[3 * i];
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hvif_point cp1 = path->points[3 * i + 1];
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hvif_point cp2 = path->points[3 * i + 2];
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uint8_t command = path_command_at(path, i);
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if (command == PATH_COMMAND_CURVE)
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cairo_curve_to(cr, cp1.x, cp1.y, cp2.x, cp2.y, p.x, p.y);
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else
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cairo_line_to(cr, p.x, p.y);
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}
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if (path->closed)
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cairo_close_path(cr);
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}
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void
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create_style(cairo_t* cr, hvif_style* style)
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{
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assert(style->num_stops > 0);
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cairo_pattern_t *pat;
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switch (style->gradient_type) {
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case GRADIENT_LINEAR:
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printf("GRADIENT_LINEAR\n");
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pat = cairo_pattern_create_linear(-64, 32, 64, 32);
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break;
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case GRADIENT_CIRCULAR:
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printf("GRADIENT_CIRCULAR\n");
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pat = cairo_pattern_create_radial(0, 0, 0, 0, 0, 64);
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break;
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case GRADIENT_DIAMOND:
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printf("GRADIENT_DIAMOND\n");
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assert(false);
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break;
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case GRADIENT_CONIC:
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printf("GRADIENT_CONIC\n");
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assert(false);
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break;
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case GRADIENT_XY:
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printf("GRADIENT_XY\n");
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assert(false);
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break;
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case GRADIENT_SQRT_XY:
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printf("GRADIENT_SQRT_XY\n");
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assert(false);
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break;
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}
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for (unsigned i = 0; i < style->num_stops; ++i) {
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printf("stop %f\n", style->offsets[i]);
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hvif_color c = style->colors[i];
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cairo_pattern_add_color_stop_rgba(pat, style->offsets[i],
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COLOR_GET_RED(c) / 255.0,
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COLOR_GET_GREEN(c) / 255.0,
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COLOR_GET_BLUE(c) / 255.0,
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COLOR_GET_ALPHA(c) / 255.0);
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}
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cairo_matrix_t transformation;
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cairo_matrix_init_from_matrix(&transformation, &style->transformation);
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if (cairo_matrix_invert(&transformation) != CAIRO_STATUS_SUCCESS) {
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printf("could not invert style transformation\n");
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exit(1);
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}
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cairo_pattern_set_matrix(pat, &transformation);
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cairo_rectangle(cr, 0, 0, 64, 64);
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cairo_set_source(cr, pat);
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cairo_fill(cr);
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cairo_pattern_destroy(pat);
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}
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bool
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hvif_render_image(const char* filename, hvif_image* image)
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{
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cairo_surface_t* surface =
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/* cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 254, 254); */
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cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 65, 64);
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cairo_t* cr = cairo_create(surface);
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/* cairo_scale(cr, 4.0, 4.0); */
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cairo_scale(cr, 1.0, 1.0);
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cairo_set_line_width(cr, 0.2);
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double r = 0;
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double delta = 1.0 / image->num_shapes;
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printf("styles %u\n", image->num_styles);
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create_style(cr, &image->styles[0]);
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/*
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for (unsigned i = 0; i < image->num_shapes; ++i) {
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cairo_set_source_rgb(cr, r, 0, 0);
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r = r + delta;
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hvif_shape s = image->shapes[i];
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if (s.hinting)
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printf("shape %u has hinting\n", i);
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else
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printf("shape %u has no hinting\n", i);
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for (unsigned j = 0; j < s.num_paths; ++j) {
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hvif_path* p = &image->paths[s.path_idxs[j]];
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create_path(cr, p);
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cairo_stroke(cr);
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}
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}
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*/
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cairo_destroy(cr);
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bool result = true;
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if (cairo_surface_write_to_png(surface, filename) != CAIRO_STATUS_SUCCESS)
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result = false;
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cairo_surface_destroy(surface);
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return result;
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}
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