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#include "svg.h"
#include <stdlib.h>
#include <stdio.h>
#include <nanosvgrast.h>
#define LOG_MODULE "svg"
#define LOG_ENABLE_DBG 0
#include "log.h"
#include "stride.h"
pixman_image_t *
svg_load(FILE *fp, const char *path)
{
pixman_image_t *pix = NULL;
uint8_t *data = NULL;
int width, height, stride;
bool ok = false;
struct NSVGimage *image = NULL;
struct NSVGrasterizer *rast = NULL;
image = nsvgParseFromFile(path, "px", 96);
width = image->width;
height = image->height;
if (width == 0 || height == 0) {
LOG_DBG("%s: width and/or heigth is zero, not a SVG?", path);
nsvgDelete(image);
return NULL;
}
stride = stride_for_format_and_width(PIXMAN_a8b8g8r8, image->width);
if (!(data = calloc(1, height * stride)))
goto out;
if (!(rast = nsvgCreateRasterizer()))
goto out;
nsvgRasterize(rast, image, 0, 0, 1, data, width, height, stride);
ok = NULL != (pix = pixman_image_create_bits_no_clear(
PIXMAN_a8b8g8r8, width, height, (uint32_t *)data, stride));
if (!ok) {
LOG_ERR("%s: failed to instanciate pixman image", path);
goto out;
}
/* Copied from fuzzel */
/* Nanosvg produces non-premultiplied ABGR, while pixman expects
* premultiplied */
for (uint32_t *abgr = (uint32_t *)data;
abgr < (uint32_t *)(data + (size_t)image->width * (size_t)image->height * 4);
abgr++) {
uint8_t alpha = (*abgr >> 24) & 0xff;
uint8_t blue = (*abgr >> 16) & 0xff;
uint8_t green = (*abgr >> 8) & 0xff;
uint8_t red = (*abgr >> 0) & 0xff;
if (alpha == 0xff)
continue;
if (alpha == 0x00)
blue = green = red = 0x00;
else {
blue = blue * alpha / 0xff;
green = green * alpha / 0xff;
red = red * alpha / 0xff;
}
*abgr = (uint32_t)alpha << 24 | blue << 16 | green << 8 | red;
}
out:
if (image)
nsvgDelete(image);
if (rast)
nsvgDeleteRasterizer(rast);
if (!ok)
free(data);
return pix;
}
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