diff options
Diffstat (limited to 'fitz/filt_dctd.c')
| -rw-r--r-- | fitz/filt_dctd.c | 256 |
1 files changed, 0 insertions, 256 deletions
diff --git a/fitz/filt_dctd.c b/fitz/filt_dctd.c deleted file mode 100644 index 1a55e584..00000000 --- a/fitz/filt_dctd.c +++ /dev/null @@ -1,256 +0,0 @@ -#include "mupdf/fitz.h" - -#include <jpeglib.h> -#include <setjmp.h> - -typedef struct fz_dctd_s fz_dctd; - -struct fz_dctd_s -{ - fz_stream *chain; - fz_context *ctx; - int color_transform; - int init; - int stride; - int l2factor; - unsigned char *scanline; - unsigned char *rp, *wp; - struct jpeg_decompress_struct cinfo; - struct jpeg_source_mgr srcmgr; - struct jpeg_error_mgr errmgr; - jmp_buf jb; - char msg[JMSG_LENGTH_MAX]; -}; - -static void error_exit(j_common_ptr cinfo) -{ - fz_dctd *state = cinfo->client_data; - cinfo->err->format_message(cinfo, state->msg); - longjmp(state->jb, 1); -} - -static void init_source(j_decompress_ptr cinfo) -{ - /* nothing to do */ -} - -static void term_source(j_decompress_ptr cinfo) -{ - /* nothing to do */ -} - -static boolean fill_input_buffer(j_decompress_ptr cinfo) -{ - struct jpeg_source_mgr *src = cinfo->src; - fz_dctd *state = cinfo->client_data; - fz_stream *chain = state->chain; - fz_context *ctx = chain->ctx; - - chain->rp = chain->wp; - fz_try(ctx) - { - fz_fill_buffer(chain); - } - fz_catch(ctx) - { - /* FIXME: TRYLATER */ - return 0; - } - src->next_input_byte = chain->rp; - src->bytes_in_buffer = chain->wp - chain->rp; - - if (src->bytes_in_buffer == 0) - { - static unsigned char eoi[2] = { 0xFF, JPEG_EOI }; - fz_warn(state->ctx, "premature end of file in jpeg"); - src->next_input_byte = eoi; - src->bytes_in_buffer = 2; - } - - return 1; -} - -static void skip_input_data(j_decompress_ptr cinfo, long num_bytes) -{ - struct jpeg_source_mgr *src = cinfo->src; - if (num_bytes > 0) - { - while ((size_t)num_bytes > src->bytes_in_buffer) - { - num_bytes -= src->bytes_in_buffer; - (void) src->fill_input_buffer(cinfo); - } - src->next_input_byte += num_bytes; - src->bytes_in_buffer -= num_bytes; - } -} - -static int -read_dctd(fz_stream *stm, unsigned char *buf, int len) -{ - fz_dctd *state = stm->state; - j_decompress_ptr cinfo = &state->cinfo; - unsigned char *p = buf; - unsigned char *ep = buf + len; - - if (setjmp(state->jb)) - { - if (cinfo->src) - state->chain->rp = state->chain->wp - cinfo->src->bytes_in_buffer; - fz_throw(stm->ctx, FZ_ERROR_GENERIC, "jpeg error: %s", state->msg); - } - - if (!state->init) - { - int c; - cinfo->client_data = state; - cinfo->err = &state->errmgr; - jpeg_std_error(cinfo->err); - cinfo->err->error_exit = error_exit; - jpeg_create_decompress(cinfo); - state->init = 1; - - /* Skip over any stray returns at the start of the stream */ - while ((c = fz_peek_byte(state->chain)) == '\n' || c == '\r') - (void)fz_read_byte(state->chain); - - cinfo->src = &state->srcmgr; - cinfo->src->init_source = init_source; - cinfo->src->fill_input_buffer = fill_input_buffer; - cinfo->src->skip_input_data = skip_input_data; - cinfo->src->resync_to_restart = jpeg_resync_to_restart; - cinfo->src->term_source = term_source; - cinfo->src->next_input_byte = state->chain->rp; - cinfo->src->bytes_in_buffer = state->chain->wp - state->chain->rp; - - jpeg_read_header(cinfo, 1); - - /* speed up jpeg decoding a bit */ - cinfo->dct_method = JDCT_FASTEST; - cinfo->do_fancy_upsampling = FALSE; - - /* default value if ColorTransform is not set */ - if (state->color_transform == -1) - { - if (state->cinfo.num_components == 3) - state->color_transform = 1; - else - state->color_transform = 0; - } - - if (cinfo->saw_Adobe_marker) - state->color_transform = cinfo->Adobe_transform; - - /* Guess the input colorspace, and set output colorspace accordingly */ - switch (cinfo->num_components) - { - case 3: - if (state->color_transform) - cinfo->jpeg_color_space = JCS_YCbCr; - else - cinfo->jpeg_color_space = JCS_RGB; - break; - case 4: - if (state->color_transform) - cinfo->jpeg_color_space = JCS_YCCK; - else - cinfo->jpeg_color_space = JCS_CMYK; - break; - } - - cinfo->scale_num = 8/(1<<state->l2factor); - cinfo->scale_denom = 8; - - jpeg_start_decompress(cinfo); - - state->stride = cinfo->output_width * cinfo->output_components; - state->scanline = fz_malloc(state->ctx, state->stride); - state->rp = state->scanline; - state->wp = state->scanline; - } - - while (state->rp < state->wp && p < ep) - *p++ = *state->rp++; - - while (p < ep) - { - if (cinfo->output_scanline == cinfo->output_height) - break; - - if (p + state->stride <= ep) - { - jpeg_read_scanlines(cinfo, &p, 1); - p += state->stride; - } - else - { - jpeg_read_scanlines(cinfo, &state->scanline, 1); - state->rp = state->scanline; - state->wp = state->scanline + state->stride; - } - - while (state->rp < state->wp && p < ep) - *p++ = *state->rp++; - } - - return p - buf; -} - -static void -close_dctd(fz_context *ctx, void *state_) -{ - fz_dctd *state = (fz_dctd *)state_; - - if (setjmp(state->jb)) - { - fz_warn(ctx, "jpeg error: %s", state->msg); - goto skip; - } - - if (state->init) - jpeg_finish_decompress(&state->cinfo); - -skip: - if (state->cinfo.src) - state->chain->rp = state->chain->wp - state->cinfo.src->bytes_in_buffer; - if (state->init) - jpeg_destroy_decompress(&state->cinfo); - - fz_free(ctx, state->scanline); - fz_close(state->chain); - fz_free(ctx, state); -} - -/* Default: color_transform = -1 (unset) */ -fz_stream * -fz_open_dctd(fz_stream *chain, int color_transform) -{ - return fz_open_resized_dctd(chain, color_transform, 0); -} - -fz_stream * -fz_open_resized_dctd(fz_stream *chain, int color_transform, int l2factor) -{ - fz_context *ctx = chain->ctx; - fz_dctd *state = NULL; - - fz_var(state); - - fz_try(ctx) - { - state = fz_malloc_struct(chain->ctx, fz_dctd); - state->ctx = ctx; - state->chain = chain; - state->color_transform = color_transform; - state->init = 0; - state->l2factor = l2factor; - } - fz_catch(ctx) - { - fz_free(ctx, state); - fz_close(chain); - fz_rethrow(ctx); - } - - return fz_new_stream(ctx, state, read_dctd, close_dctd); -} |