--- /dev/null
+/*
+libimago - a multi-format image file input/output library.
+Copyright (C) 2010 John Tsiombikas <nuclear@member.fsf.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published
+by the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+#include <string.h>
+#include "imago2.h"
+
+/* pixel-format conversions are sub-optimal at the moment to avoid
+ * writing a lot of code. optimize at some point ?
+ */
+
+#define CLAMP(x, a, b) ((x) < (a) ? (a) : ((x) > (b) ? (b) : (x)))
+
+struct pixel {
+ float r, g, b, a;
+};
+
+static void unpack_grey8(struct pixel *unp, void *pptr, int count);
+static void unpack_rgb24(struct pixel *unp, void *pptr, int count);
+static void unpack_rgba32(struct pixel *unp, void *pptr, int count);
+static void unpack_greyf(struct pixel *unp, void *pptr, int count);
+static void unpack_rgbf(struct pixel *unp, void *pptr, int count);
+static void unpack_rgbaf(struct pixel *unp, void *pptr, int count);
+
+static void pack_grey8(void *pptr, struct pixel *unp, int count);
+static void pack_rgb24(void *pptr, struct pixel *unp, int count);
+static void pack_rgba32(void *pptr, struct pixel *unp, int count);
+static void pack_greyf(void *pptr, struct pixel *unp, int count);
+static void pack_rgbf(void *pptr, struct pixel *unp, int count);
+static void pack_rgbaf(void *pptr, struct pixel *unp, int count);
+
+/* XXX keep in sync with enum img_fmt at imago2.h */
+static void (*unpack[])(struct pixel*, void*, int) = {
+ unpack_grey8,
+ unpack_rgb24,
+ unpack_rgba32,
+ unpack_greyf,
+ unpack_rgbf,
+ unpack_rgbaf
+};
+
+/* XXX keep in sync with enum img_fmt at imago2.h */
+static void (*pack[])(void*, struct pixel*, int) = {
+ pack_grey8,
+ pack_rgb24,
+ pack_rgba32,
+ pack_greyf,
+ pack_rgbf,
+ pack_rgbaf
+};
+
+
+int img_convert(struct img_pixmap *img, enum img_fmt tofmt)
+{
+ struct pixel pbuf[8];
+ int bufsz = (img->width & 7) == 0 ? 8 : ((img->width & 3) == 0 ? 4 : 1);
+ int i, num_pix = img->width * img->height;
+ int num_iter = num_pix / bufsz;
+ char *sptr, *dptr;
+ struct img_pixmap nimg;
+
+ if(img->fmt == tofmt) {
+ return 0; /* nothing to do */
+ }
+
+ img_init(&nimg);
+ if(img_set_pixels(&nimg, img->width, img->height, tofmt, 0) == -1) {
+ img_destroy(&nimg);
+ return -1;
+ }
+
+ sptr = img->pixels;
+ dptr = nimg.pixels;
+
+ for(i=0; i<num_iter; i++) {
+ unpack[img->fmt](pbuf, sptr, bufsz);
+ pack[tofmt](dptr, pbuf, bufsz);
+
+ sptr += bufsz * img->pixelsz;
+ dptr += bufsz * nimg.pixelsz;
+ }
+
+ img_copy(img, &nimg);
+ img_destroy(&nimg);
+ return 0;
+}
+
+/* the following functions *could* benefit from SIMD */
+
+static void unpack_grey8(struct pixel *unp, void *pptr, int count)
+{
+ int i;
+ unsigned char *pix = pptr;
+
+ for(i=0; i<count; i++) {
+ unp->r = unp->g = unp->b = (float)*pix++ / 255.0;
+ unp->a = 1.0;
+ unp++;
+ }
+}
+
+static void unpack_rgb24(struct pixel *unp, void *pptr, int count)
+{
+ int i;
+ unsigned char *pix = pptr;
+
+ for(i=0; i<count; i++) {
+ unp->r = (float)*pix++ / 255.0;
+ unp->g = (float)*pix++ / 255.0;
+ unp->b = (float)*pix++ / 255.0;
+ unp->a = 1.0;
+ unp++;
+ }
+}
+
+static void unpack_rgba32(struct pixel *unp, void *pptr, int count)
+{
+ int i;
+ unsigned char *pix = pptr;
+
+ for(i=0; i<count; i++) {
+ unp->r = (float)*pix++ / 255.0;
+ unp->g = (float)*pix++ / 255.0;
+ unp->b = (float)*pix++ / 255.0;
+ unp->a = (float)*pix++ / 255.0;
+ unp++;
+ }
+}
+
+static void unpack_greyf(struct pixel *unp, void *pptr, int count)
+{
+ int i;
+ float *pix = pptr;
+
+ for(i=0; i<count; i++) {
+ unp->r = unp->g = unp->b = *pix++;
+ unp->a = 1.0;
+ unp++;
+ }
+}
+
+static void unpack_rgbf(struct pixel *unp, void *pptr, int count)
+{
+ int i;
+ float *pix = pptr;
+
+ for(i=0; i<count; i++) {
+ unp->r = *pix++;
+ unp->g = *pix++;
+ unp->b = *pix++;
+ unp->a = 1.0;
+ unp++;
+ }
+}
+
+static void unpack_rgbaf(struct pixel *unp, void *pptr, int count)
+{
+ int i;
+ float *pix = pptr;
+
+ for(i=0; i<count; i++) {
+ unp->r = *pix++;
+ unp->g = *pix++;
+ unp->b = *pix++;
+ unp->a = *pix++;
+ unp++;
+ }
+}
+
+
+static void pack_grey8(void *pptr, struct pixel *unp, int count)
+{
+ int i;
+ unsigned char *pix = pptr;
+
+ for(i=0; i<count; i++) {
+ int lum = (int)(255.0 * (unp->r + unp->g + unp->b) / 3.0);
+ *pix++ = CLAMP(lum, 0, 255);
+ unp++;
+ }
+}
+
+static void pack_rgb24(void *pptr, struct pixel *unp, int count)
+{
+ int i;
+ unsigned char *pix = pptr;
+
+ for(i=0; i<count; i++) {
+ int r = (int)(unp->r * 255.0);
+ int g = (int)(unp->g * 255.0);
+ int b = (int)(unp->b * 255.0);
+
+ *pix++ = CLAMP(r, 0, 255);
+ *pix++ = CLAMP(g, 0, 255);
+ *pix++ = CLAMP(b, 0, 255);
+ unp++;
+ }
+}
+
+static void pack_rgba32(void *pptr, struct pixel *unp, int count)
+{
+ int i;
+ unsigned char *pix = pptr;
+
+ for(i=0; i<count; i++) {
+ int r = (int)(unp->r * 255.0);
+ int g = (int)(unp->g * 255.0);
+ int b = (int)(unp->b * 255.0);
+ int a = (int)(unp->a * 255.0);
+
+ *pix++ = CLAMP(r, 0, 255);
+ *pix++ = CLAMP(g, 0, 255);
+ *pix++ = CLAMP(b, 0, 255);
+ *pix++ = CLAMP(a, 0, 255);
+ unp++;
+ }
+}
+
+static void pack_greyf(void *pptr, struct pixel *unp, int count)
+{
+ int i;
+ float *pix = pptr;
+
+ for(i=0; i<count; i++) {
+ *pix++ = (unp->r + unp->g + unp->b) / 3.0;
+ unp++;
+ }
+}
+
+static void pack_rgbf(void *pptr, struct pixel *unp, int count)
+{
+ int i;
+ float *pix = pptr;
+
+ for(i=0; i<count; i++) {
+ *pix++ = unp->r;
+ *pix++ = unp->g;
+ *pix++ = unp->b;
+ unp++;
+ }
+}
+
+static void pack_rgbaf(void *pptr, struct pixel *unp, int count)
+{
+ memcpy(pptr, unp, count * sizeof *unp);
+}
+
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