maride/guacamole-spice-protocol
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Add surface compare.

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This commit is contained in:
Michael Jumper 2012-08-19 23:18:52 -07:00
parent b35947daea
commit 88445c5cb8
2 changed files with 40 additions and 0 deletions
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2
libguac/include/hash.h
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@ -53,5 +53,7 @@
*/ */
unsigned int guac_hash_surface(cairo_surface_t* surface); unsigned int guac_hash_surface(cairo_surface_t* surface);
int guac_surface_cmp(cairo_surface_t* a, cairo_surface_t* b);
#endif #endif

38
libguac/src/hash.c
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@ -37,6 +37,7 @@
#include <stdint.h> #include <stdint.h>
#include <string.h>
#include <cairo/cairo.h> #include <cairo/cairo.h>
/* /*
@ -111,3 +112,40 @@ unsigned int guac_hash_surface(cairo_surface_t* surface) {
} }
int guac_surface_cmp(cairo_surface_t* a, cairo_surface_t* b) {
/* Surface A metrics */
unsigned char* data_a = cairo_image_surface_get_data(a);
int width_a = cairo_image_surface_get_width(a);
int height_a = cairo_image_surface_get_height(a);
int stride_a = cairo_image_surface_get_stride(a);
/* Surface B metrics */
unsigned char* data_b = cairo_image_surface_get_data(b);
int width_b = cairo_image_surface_get_width(b);
int height_b = cairo_image_surface_get_height(b);
int stride_b = cairo_image_surface_get_stride(b);
int y;
/* If core dimensions differ, just compare those. Done. */
if (width_a != width_b) return width_a - width_b;
if (height_a != height_b) return height_a - height_b;
for (y=0; y<height_a; y++) {
/* Compare row. If different, use that result. */
int cmp_result = memcmp(data_a, data_b, width_a * 4);
if (cmp_result != 0)
return cmp_result;
/* Next row */
data_a += stride_a;
data_b += stride_b;
}
/* Otherwise, same. */
return 0;
}