143 lines
3.3 KiB
C
143 lines
3.3 KiB
C
/* Farbfeld (http://tools.suckless.org/farbfeld) */
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#include "config.h"
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#include "Imlib2_Loader.h"
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#include <arpa/inet.h>
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static const char *const _formats[] = { "ff" };
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#define mm_check(p) ((const char *)(p) <= (const char *)im->fi->fdata + im->fi->fsize)
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typedef struct {
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unsigned char magic[8];
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uint32_t w, h;
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} ff_hdr_t;
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static int
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_load(ImlibImage *im, int load_data)
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{
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int rc;
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int rowlen, i, j;
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const ff_hdr_t *hdr;
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const uint16_t *row;
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uint8_t *imdata;
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rc = LOAD_FAIL;
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if (im->fi->fsize < (long)sizeof(ff_hdr_t))
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return rc;
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/* read and check the header */
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hdr = im->fi->fdata;
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if (memcmp("farbfeld", hdr->magic, sizeof(hdr->magic)))
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goto quit;
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rc = LOAD_BADIMAGE; /* Format accepted */
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im->w = ntohl(hdr->w);
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im->h = ntohl(hdr->h);
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if (!IMAGE_DIMENSIONS_OK(im->w, im->h))
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goto quit;
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im->has_alpha = 1;
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if (!load_data)
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QUIT_WITH_RC(LOAD_SUCCESS);
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/* Load data */
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if (!__imlib_AllocateData(im))
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QUIT_WITH_RC(LOAD_OOM);
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rowlen = 4 * im->w; /* RGBA */
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imdata = (uint8_t *) im->data;
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row = (uint16_t *) (hdr + 1);
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for (i = 0; i < im->h; i++, imdata += rowlen, row += rowlen)
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{
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if (!mm_check(row + rowlen))
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goto quit;
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for (j = 0; j < rowlen; j += 4)
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{
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/*
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* 16-Bit to 8-Bit (RGBA -> BGRA)
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* 255 * 257 = 65535 = 2^16-1 = UINT16_MAX
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*/
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imdata[j + 2] = ntohs(row[j + 0]) / 257;
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imdata[j + 1] = ntohs(row[j + 1]) / 257;
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imdata[j + 0] = ntohs(row[j + 2]) / 257;
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imdata[j + 3] = ntohs(row[j + 3]) / 257;
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}
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if (im->lc && __imlib_LoadProgressRows(im, i, 1))
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QUIT_WITH_RC(LOAD_BREAK);
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}
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rc = LOAD_SUCCESS;
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quit:
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return rc;
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}
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static int
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_save(ImlibImage *im)
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{
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int rc;
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FILE *f = im->fi->fp;
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size_t rowlen, i, j;
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uint32_t tmp32;
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uint16_t *row;
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const uint8_t *imdata;
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rc = LOAD_BADFILE;
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row = NULL;
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/* write header */
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fputs("farbfeld", f);
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tmp32 = htonl(im->w);
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if (fwrite(&tmp32, sizeof(uint32_t), 1, f) != 1)
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goto quit;
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tmp32 = htonl(im->h);
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if (fwrite(&tmp32, sizeof(uint32_t), 1, f) != 1)
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goto quit;
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/* write data */
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rowlen = im->w * (sizeof("RGBA") - 1);
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row = malloc(rowlen * sizeof(uint16_t));
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if (!row)
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QUIT_WITH_RC(LOAD_OOM);
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imdata = (uint8_t *) im->data;
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for (i = 0; i < (uint32_t) im->h; ++i, imdata += rowlen)
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{
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for (j = 0; j < rowlen; j += 4)
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{
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/*
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* 8-Bit to 16-Bit
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* 255 * 257 = 65535 = 2^16-1 = UINT16_MAX
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*/
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row[j + 0] = htons(imdata[j + 2] * 257);
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row[j + 1] = htons(imdata[j + 1] * 257);
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row[j + 2] = htons(imdata[j + 0] * 257);
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row[j + 3] = htons(imdata[j + 3] * 257);
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}
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if (fwrite(row, sizeof(uint16_t), rowlen, f) != rowlen)
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goto quit;
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if (im->lc && __imlib_LoadProgressRows(im, i, 1))
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QUIT_WITH_RC(LOAD_BREAK);
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}
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rc = LOAD_SUCCESS;
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quit:
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free(row);
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return rc;
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}
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IMLIB_LOADER(_formats, _load, _save);
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