1 files changed, 82 insertions, 0 deletions
diff --git a/svg.c b/svg.c
new file mode 100644
index 0000000..b5fa4b3
--- /dev/null
+++ b/svg.c
@@ -0,0 +1,82 @@
+#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_ERR("%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;
+}