X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=eradicate;a=blobdiff_plain;f=libs%2Fimago%2Fsrc%2Fconv.c;fp=libs%2Fimago%2Fsrc%2Fconv.c;h=334fe356df107f6f0602bbc300b51fd48549059a;hp=0000000000000000000000000000000000000000;hb=1ee7845621c04020321fa8dfb6dcbf3d8c6c9b51;hpb=02e7611eefd46380cbce65ace9da8399c27e78e8 diff --git a/libs/imago/src/conv.c b/libs/imago/src/conv.c new file mode 100644 index 0000000..334fe35 --- /dev/null +++ b/libs/imago/src/conv.c @@ -0,0 +1,260 @@ +/* +libimago - a multi-format image file input/output library. +Copyright (C) 2010 John Tsiombikas + +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 . +*/ +#include +#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; ifmt](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; ir = 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; ir = (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; ir = (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; ir = 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; ir = *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; ir = *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; ir + 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; ir * 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; ir * 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; ir + 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; ir; + *pix++ = unp->g; + *pix++ = unp->b; + unp++; + } +} + +static void pack_rgbaf(void *pptr, struct pixel *unp, int count) +{ + memcpy(pptr, unp, count * sizeof *unp); +} +