--- /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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "imago2.h"
+#include "ftmodule.h"
+
+static int pixel_size(enum img_fmt fmt);
+static size_t def_read(void *buf, size_t bytes, void *uptr);
+static size_t def_write(void *buf, size_t bytes, void *uptr);
+static long def_seek(long offset, int whence, void *uptr);
+
+
+void img_init(struct img_pixmap *img)
+{
+ img->pixels = 0;
+ img->width = img->height = 0;
+ img->fmt = IMG_FMT_RGBA32;
+ img->pixelsz = pixel_size(img->fmt);
+ img->name = 0;
+}
+
+
+void img_destroy(struct img_pixmap *img)
+{
+ free(img->pixels);
+ img->pixels = 0; /* just in case... */
+ img->width = img->height = 0xbadbeef;
+ free(img->name);
+}
+
+struct img_pixmap *img_create(void)
+{
+ struct img_pixmap *p;
+
+ if(!(p = malloc(sizeof *p))) {
+ return 0;
+ }
+ img_init(p);
+ return p;
+}
+
+void img_free(struct img_pixmap *img)
+{
+ img_destroy(img);
+ free(img);
+}
+
+int img_set_name(struct img_pixmap *img, const char *name)
+{
+ char *tmp;
+
+ if(!(tmp = malloc(strlen(name) + 1))) {
+ return -1;
+ }
+ strcpy(tmp, name);
+ img->name = tmp;
+ return 0;
+}
+
+int img_set_format(struct img_pixmap *img, enum img_fmt fmt)
+{
+ if(img->pixels) {
+ return img_convert(img, fmt);
+ }
+ img->fmt = fmt;
+ return 0;
+}
+
+int img_copy(struct img_pixmap *dest, struct img_pixmap *src)
+{
+ return img_set_pixels(dest, src->width, src->height, src->fmt, src->pixels);
+}
+
+int img_set_pixels(struct img_pixmap *img, int w, int h, enum img_fmt fmt, void *pix)
+{
+ void *newpix;
+ int pixsz = pixel_size(fmt);
+
+ if(!(newpix = malloc(w * h * pixsz))) {
+ return -1;
+ }
+
+ if(pix) {
+ memcpy(newpix, pix, w * h * pixsz);
+ } else {
+ memset(newpix, 0, w * h * pixsz);
+ }
+
+ free(img->pixels);
+ img->pixels = newpix;
+ img->width = w;
+ img->height = h;
+ img->pixelsz = pixsz;
+ img->fmt = fmt;
+ return 0;
+}
+
+void *img_load_pixels(const char *fname, int *xsz, int *ysz, enum img_fmt fmt)
+{
+ struct img_pixmap img;
+
+ img_init(&img);
+
+ if(img_load(&img, fname) == -1) {
+ return 0;
+ }
+ if(img.fmt != fmt) {
+ if(img_convert(&img, fmt) == -1) {
+ img_destroy(&img);
+ return 0;
+ }
+ }
+
+ *xsz = img.width;
+ *ysz = img.height;
+ return img.pixels;
+}
+
+int img_save_pixels(const char *fname, void *pix, int xsz, int ysz, enum img_fmt fmt)
+{
+ int res;
+ struct img_pixmap img;
+
+ img_init(&img);
+ img.fmt = fmt;
+ img.width = xsz;
+ img.height = ysz;
+ img.pixels = pix;
+
+ res = img_save(&img, fname);
+ img.pixels = 0;
+ img_destroy(&img);
+ return res;
+}
+
+void img_free_pixels(void *pix)
+{
+ free(pix);
+}
+
+int img_load(struct img_pixmap *img, const char *fname)
+{
+ int res;
+ FILE *fp;
+
+ if(!(fp = fopen(fname, "rb"))) {
+ return -1;
+ }
+ res = img_read_file(img, fp);
+ fclose(fp);
+ return res;
+}
+
+/* TODO implement filetype selection */
+int img_save(struct img_pixmap *img, const char *fname)
+{
+ int res;
+ FILE *fp;
+
+ img_set_name(img, fname);
+
+ if(!(fp = fopen(fname, "wb"))) {
+ return -1;
+ }
+ res = img_write_file(img, fp);
+ fclose(fp);
+ return res;
+}
+
+int img_read_file(struct img_pixmap *img, FILE *fp)
+{
+ struct img_io io = {0, def_read, def_write, def_seek};
+
+ io.uptr = fp;
+ return img_read(img, &io);
+}
+
+int img_write_file(struct img_pixmap *img, FILE *fp)
+{
+ struct img_io io = {0, def_read, def_write, def_seek};
+
+ io.uptr = fp;
+ return img_write(img, &io);
+}
+
+int img_read(struct img_pixmap *img, struct img_io *io)
+{
+ struct ftype_module *mod;
+
+ if((mod = img_find_format_module(io))) {
+ return mod->read(img, io);
+ }
+ return -1;
+}
+
+int img_write(struct img_pixmap *img, struct img_io *io)
+{
+ struct ftype_module *mod;
+
+ if(!img->name || !(mod = img_guess_format(img->name))) {
+ /* TODO throw some sort of warning? */
+ /* TODO implement some sort of module priority or let the user specify? */
+ if(!(mod = img_get_module(0))) {
+ return -1;
+ }
+ }
+
+ return mod->write(img, io);
+}
+
+int img_to_float(struct img_pixmap *img)
+{
+ enum img_fmt targ_fmt;
+
+ switch(img->fmt) {
+ case IMG_FMT_GREY8:
+ targ_fmt = IMG_FMT_GREYF;
+ break;
+
+ case IMG_FMT_RGB24:
+ targ_fmt = IMG_FMT_RGBF;
+ break;
+
+ case IMG_FMT_RGBA32:
+ targ_fmt = IMG_FMT_RGBAF;
+ break;
+
+ default:
+ return 0; /* already float */
+ }
+
+ return img_convert(img, targ_fmt);
+}
+
+int img_to_integer(struct img_pixmap *img)
+{
+ enum img_fmt targ_fmt;
+
+ switch(img->fmt) {
+ case IMG_FMT_GREYF:
+ targ_fmt = IMG_FMT_GREY8;
+ break;
+
+ case IMG_FMT_RGBF:
+ targ_fmt = IMG_FMT_RGB24;
+ break;
+
+ case IMG_FMT_RGBAF:
+ targ_fmt = IMG_FMT_RGBA32;
+ break;
+
+ default:
+ return 0; /* already integer */
+ }
+
+ return img_convert(img, targ_fmt);
+}
+
+int img_is_float(struct img_pixmap *img)
+{
+ return img->fmt >= IMG_FMT_GREYF && img->fmt <= IMG_FMT_RGBAF;
+}
+
+int img_has_alpha(struct img_pixmap *img)
+{
+ if(img->fmt == IMG_FMT_RGBA32 || img->fmt == IMG_FMT_RGBAF) {
+ return 1;
+ }
+ return 0;
+}
+
+
+void img_setpixel(struct img_pixmap *img, int x, int y, void *pixel)
+{
+ char *dest = (char*)img->pixels + (y * img->width + x) * img->pixelsz;
+ memcpy(dest, pixel, img->pixelsz);
+}
+
+void img_getpixel(struct img_pixmap *img, int x, int y, void *pixel)
+{
+ char *dest = (char*)img->pixels + (y * img->width + x) * img->pixelsz;
+ memcpy(pixel, dest, img->pixelsz);
+}
+
+void img_setpixel1i(struct img_pixmap *img, int x, int y, int pix)
+{
+ img_setpixel4i(img, x, y, pix, pix, pix, pix);
+}
+
+void img_setpixel1f(struct img_pixmap *img, int x, int y, float pix)
+{
+ img_setpixel4f(img, x, y, pix, pix, pix, pix);
+}
+
+void img_setpixel4i(struct img_pixmap *img, int x, int y, int r, int g, int b, int a)
+{
+ if(img_is_float(img)) {
+ img_setpixel4f(img, x, y, r / 255.0, g / 255.0, b / 255.0, a / 255.0);
+ } else {
+ unsigned char pixel[4];
+ pixel[0] = r;
+ pixel[1] = g;
+ pixel[2] = b;
+ pixel[3] = a;
+
+ img_setpixel(img, x, y, pixel);
+ }
+}
+
+void img_setpixel4f(struct img_pixmap *img, int x, int y, float r, float g, float b, float a)
+{
+ if(img_is_float(img)) {
+ float pixel[4];
+ pixel[0] = r;
+ pixel[1] = g;
+ pixel[2] = b;
+ pixel[3] = a;
+
+ img_setpixel(img, x, y, pixel);
+ } else {
+ img_setpixel4i(img, x, y, (int)(r * 255.0), (int)(g * 255.0), (int)(b * 255.0), (int)(a * 255.0));
+ }
+}
+
+void img_getpixel1i(struct img_pixmap *img, int x, int y, int *pix)
+{
+ int junk[3];
+ img_getpixel4i(img, x, y, pix, junk, junk + 1, junk + 2);
+}
+
+void img_getpixel1f(struct img_pixmap *img, int x, int y, float *pix)
+{
+ float junk[3];
+ img_getpixel4f(img, x, y, pix, junk, junk + 1, junk + 2);
+}
+
+void img_getpixel4i(struct img_pixmap *img, int x, int y, int *r, int *g, int *b, int *a)
+{
+ if(img_is_float(img)) {
+ float pixel[4] = {0, 0, 0, 0};
+ img_getpixel(img, x, y, pixel);
+ *r = pixel[0] * 255.0;
+ *g = pixel[1] * 255.0;
+ *b = pixel[2] * 255.0;
+ *a = pixel[3] * 255.0;
+ } else {
+ unsigned char pixel[4];
+ img_getpixel(img, x, y, pixel);
+ *r = pixel[0];
+ *g = pixel[1];
+ *b = pixel[2];
+ *a = pixel[3];
+ }
+}
+
+void img_getpixel4f(struct img_pixmap *img, int x, int y, float *r, float *g, float *b, float *a)
+{
+ if(img_is_float(img)) {
+ float pixel[4] = {0, 0, 0, 0};
+ img_getpixel(img, x, y, pixel);
+ *r = pixel[0];
+ *g = pixel[1];
+ *b = pixel[2];
+ *a = pixel[3];
+ } else {
+ unsigned char pixel[4];
+ img_getpixel(img, x, y, pixel);
+ *r = pixel[0] / 255.0;
+ *g = pixel[1] / 255.0;
+ *b = pixel[2] / 255.0;
+ *a = pixel[3] / 255.0;
+ }
+}
+
+void img_io_set_user_data(struct img_io *io, void *uptr)
+{
+ io->uptr = uptr;
+}
+
+void img_io_set_read_func(struct img_io *io, size_t (*read)(void*, size_t, void*))
+{
+ io->read = read;
+}
+
+void img_io_set_write_func(struct img_io *io, size_t (*write)(void*, size_t, void*))
+{
+ io->write = write;
+}
+
+void img_io_set_seek_func(struct img_io *io, long (*seek)(long, int, void*))
+{
+ io->seek = seek;
+}
+
+
+static int pixel_size(enum img_fmt fmt)
+{
+ switch(fmt) {
+ case IMG_FMT_GREY8:
+ return 1;
+ case IMG_FMT_RGB24:
+ return 3;
+ case IMG_FMT_RGBA32:
+ return 4;
+ case IMG_FMT_GREYF:
+ return sizeof(float);
+ case IMG_FMT_RGBF:
+ return 3 * sizeof(float);
+ case IMG_FMT_RGBAF:
+ return 4 * sizeof(float);
+ default:
+ break;
+ }
+ return 0;
+}
+
+static size_t def_read(void *buf, size_t bytes, void *uptr)
+{
+ return uptr ? fread(buf, 1, bytes, uptr) : 0;
+}
+
+static size_t def_write(void *buf, size_t bytes, void *uptr)
+{
+ return uptr ? fwrite(buf, 1, bytes, uptr) : 0;
+}
+
+static long def_seek(long offset, int whence, void *uptr)
+{
+ if(!uptr || fseek(uptr, offset, whence) == -1) {
+ return -1;
+ }
+ return ftell(uptr);
+}
+
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