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#include "svg.h"
#include <stdlib.h>
#include <stdio.h>
#include <nanosvg/nanosvgrast.h>
#define LOG_MODULE "svg"
#define LOG_ENABLE_DBG 0
#include "log.h"
#include "stride.h"
struct NSVGimage *svg_image = NULL;
struct NSVGrasterizer *rast = NULL;
bool
svg_load(FILE *fp, const char *path)
{
svg_image = nsvgParseFromFile(path, "px", 96);
if (svg_image == NULL)
return false;
if (svg_image->width == 0 || svg_image->height == 0) {
LOG_DBG("%s: width and/or heigth is zero, not a SVG?", path);
nsvgDelete(svg_image);
svg_image = NULL;
return false;
}
rast = nsvgCreateRasterizer();
if (rast == NULL)
return false;
return true;
}
pixman_image_t *
svg_render(const int width, const int height)
{
pixman_image_t *pix = NULL;
uint8_t *data = NULL;
int stride = stride_for_format_and_width(PIXMAN_a8b8g8r8, width);
if (!(data = calloc(1, height * stride)))
return NULL;
double sx = width / (double)svg_image->width;
double sy = height / (double)svg_image->height;
float s = sx > sy ? sy : sx;
float tx = (width - svg_image->width * s) / 2;
float ty = (height - svg_image->height * s) / 2;
nsvgRasterize(rast, svg_image, tx, ty, s, data, width, height, stride);
pix = pixman_image_create_bits_no_clear(PIXMAN_a8b8g8r8, width,
height, (uint32_t *)data, stride);
if (pix == NULL) {
LOG_ERR("failed to render svg image");
free(data);
return NULL;
}
/* 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)width * (size_t)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;
}
return pix;
}
void
svg_free()
{
if (svg_image != NULL)
nsvgDelete(svg_image);
if (rast != NULL)
nsvgDeleteRasterizer(rast);
}
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