+++ /dev/null
-/*
-libimago - a multi-format image file input/output library.
-Copyright (C) 2010-2015 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/>.
-*/
-
-/* -- Targa (tga) module -- */
-
-#include <string.h>
-#include <stdlib.h>
-#include <stdint.h>
-#include "imago2.h"
-#include "ftype_module.h"
-
-
-#if defined(__i386__) || defined(__ia64__) || defined(WIN32) || \
- (defined(__alpha__) || defined(__alpha)) || \
- defined(__arm__) || \
- (defined(__mips__) && defined(__MIPSEL__)) || \
- defined(__SYMBIAN32__) || \
- defined(__x86_64__) || \
- defined(__LITTLE_ENDIAN__)
-/* little endian */
-#define read_int16_le(f) read_int16(f)
-#else
-/* big endian */
-#define read_int16_le(f) read_int16_inv(f)
-#endif /* endian check */
-
-
-enum {
- IMG_NONE,
- IMG_CMAP,
- IMG_RGBA,
- IMG_BW,
-
- IMG_RLE_CMAP = 9,
- IMG_RLE_RGBA,
- IMG_RLE_BW
-};
-
-#define IS_RLE(x) ((x) >= IMG_RLE_CMAP)
-#define IS_RGBA(x) ((x) == IMG_RGBA || (x) == IMG_RLE_RGBA)
-
-
-struct tga_header {
- uint8_t idlen; /* id field length */
- uint8_t cmap_type; /* color map type (0:no color map, 1:color map present) */
- uint8_t img_type; /* image type:
- * 0: no image data
- * 1: uncomp. color-mapped 9: RLE color-mapped
- * 2: uncomp. true color 10: RLE true color
- * 3: uncomp. black/white 11: RLE black/white */
- uint16_t cmap_first; /* color map first entry index */
- uint16_t cmap_len; /* color map length */
- uint8_t cmap_entry_sz; /* color map entry size */
- uint16_t img_x; /* X-origin of the image */
- uint16_t img_y; /* Y-origin of the image */
- uint16_t img_width; /* image width */
- uint16_t img_height; /* image height */
- uint8_t img_bpp; /* bits per pixel */
- uint8_t img_desc; /* descriptor:
- * bits 0 - 3: alpha or overlay bits
- * bits 5 & 4: origin (0 = bottom/left, 1 = top/right)
- * bits 7 & 6: data interleaving */
-};
-
-struct tga_footer {
- uint32_t ext_off; /* extension area offset */
- uint32_t devdir_off; /* developer directory offset */
- char sig[18]; /* signature with . and \0 */
-};
-
-
-static int check(struct img_io *io);
-static int read(struct img_pixmap *img, struct img_io *io);
-static int write(struct img_pixmap *img, struct img_io *io);
-static int read_pixel(struct img_io *io, int rdalpha, uint32_t *pix);
-static int16_t read_int16(struct img_io *io);
-static int16_t read_int16_inv(struct img_io *io);
-
-int img_register_tga(void)
-{
- static struct ftype_module mod = {".tga", check, read, write};
- return img_register_module(&mod);
-}
-
-
-static int check(struct img_io *io)
-{
- struct tga_footer foot;
- int res = -1;
- long pos = io->seek(0, SEEK_CUR, io->uptr);
- io->seek(-18, SEEK_END, io->uptr);
-
- if(io->read(foot.sig, 17, io->uptr) < 17) {
- io->seek(pos, SEEK_SET, io->uptr);
- return -1;
- }
-
- if(memcmp(foot.sig, "TRUEVISION-XFILE.", 17) == 0) {
- res = 0;
- }
- io->seek(pos, SEEK_SET, io->uptr);
- return res;
-}
-
-static int iofgetc(struct img_io *io)
-{
- char c;
- return io->read(&c, 1, io->uptr) < 1 ? -1 : c;
-}
-
-static int read(struct img_pixmap *img, struct img_io *io)
-{
- struct tga_header hdr;
- int x, y;
- int i, c;
- uint32_t ppixel = 0;
- int rle_mode = 0, rle_pix_left = 0;
- int rdalpha;
-
- /* read header */
- hdr.idlen = iofgetc(io);
- hdr.cmap_type = iofgetc(io);
- hdr.img_type = iofgetc(io);
- hdr.cmap_first = read_int16_le(io);
- hdr.cmap_len = read_int16_le(io);
- hdr.cmap_entry_sz = iofgetc(io);
- hdr.img_x = read_int16_le(io);
- hdr.img_y = read_int16_le(io);
- hdr.img_width = read_int16_le(io);
- hdr.img_height = read_int16_le(io);
- hdr.img_bpp = iofgetc(io);
- if((c = iofgetc(io)) == -1) {
- return -1;
- }
- hdr.img_desc = c;
-
- if(!IS_RGBA(hdr.img_type)) {
- fprintf(stderr, "only true color tga images supported\n");
- return -1;
- }
-
- io->seek(hdr.idlen, SEEK_CUR, io); /* skip the image ID */
-
- /* skip the color map if it exists */
- if(hdr.cmap_type == 1) {
- io->seek(hdr.cmap_len * hdr.cmap_entry_sz / 8, SEEK_CUR, io);
- }
-
- x = hdr.img_width;
- y = hdr.img_height;
- rdalpha = hdr.img_desc & 0xf;
-
- /* TODO make this IMG_FMT_RGB24 if there's no alpha channel */
- if(img_set_pixels(img, x, y, IMG_FMT_RGBA32, 0) == -1) {
- return -1;
- }
-
- for(i=0; i<y; i++) {
- uint32_t *ptr;
- int j;
-
- ptr = (uint32_t*)img->pixels + ((hdr.img_desc & 0x20) ? i : y - (i + 1)) * x;
-
- for(j=0; j<x; j++) {
- /* if the image is raw, then just read the next pixel */
- if(!IS_RLE(hdr.img_type)) {
- if(read_pixel(io, rdalpha, &ppixel) == -1) {
- return -1;
- }
- } else {
- /* otherwise, for RLE... */
-
- /* if we have pixels left in the packet ... */
- if(rle_pix_left) {
- /* if it's a raw packet, read the next pixel, otherwise keep the same */
- if(!rle_mode) {
- if(read_pixel(io, rdalpha, &ppixel) == -1) {
- return -1;
- }
- }
- --rle_pix_left;
- } else {
- /* read RLE packet header */
- unsigned char phdr = iofgetc(io);
- rle_mode = (phdr & 128); /* last bit shows the mode for this packet (1: rle, 0: raw) */
- rle_pix_left = (phdr & ~128); /* the rest gives the count of pixels minus one (we also read one here, so no +1) */
- /* and read the first pixel of the packet */
- if(read_pixel(io, rdalpha, &ppixel) == -1) {
- return -1;
- }
- }
- }
-
- *ptr++ = ppixel;
- }
- }
-
- return 0;
-}
-
-static int write(struct img_pixmap *img, struct img_io *io)
-{
- return -1; /* TODO */
-}
-
-#define PACK_COLOR32(r,g,b,a) \
- ((((a) & 0xff) << 24) | \
- (((r) & 0xff) << 0) | \
- (((g) & 0xff) << 8) | \
- (((b) & 0xff) << 16))
-
-static int read_pixel(struct img_io *io, int rdalpha, uint32_t *pix)
-{
- int r, g, b, a;
- b = iofgetc(io);
- g = iofgetc(io);
- r = iofgetc(io);
- a = rdalpha ? iofgetc(io) : 0xff;
- *pix = PACK_COLOR32(r, g, b, a);
- return a == -1 || r == -1 ? -1 : 0;
-}
-
-static int16_t read_int16(struct img_io *io)
-{
- int16_t v;
- io->read(&v, 2, io);
- return v;
-}
-
-static int16_t read_int16_inv(struct img_io *io)
-{
- int16_t v;
- io->read(&v, 2, io);
- return ((v >> 8) & 0xff) | (v << 8);
-}
projects / dosdemo / blobdiff