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Diffstat (limited to 'jpg/transupp.c')
| -rw-r--r-- | jpg/transupp.c | 1597 |
1 files changed, 0 insertions, 1597 deletions
diff --git a/jpg/transupp.c b/jpg/transupp.c deleted file mode 100644 index 016f383..0000000 --- a/jpg/transupp.c +++ /dev/null @@ -1,1597 +0,0 @@ -/* - * transupp.c - * - * Copyright (C) 1997-2011, Thomas G. Lane, Guido Vollbeding. - * This file is part of the Independent JPEG Group's software. - * For conditions of distribution and use, see the accompanying README file. - * - * This file contains image transformation routines and other utility code - * used by the jpegtran sample application. These are NOT part of the core - * JPEG library. But we keep these routines separate from jpegtran.c to - * ease the task of maintaining jpegtran-like programs that have other user - * interfaces. - */ - -/* Although this file really shouldn't have access to the library internals, - * it's helpful to let it call jround_up() and jcopy_block_row(). - */ -#define JPEG_INTERNALS - -#include "jinclude.h" -#include "jpeglib.h" -#include "transupp.h" /* My own external interface */ -#include <ctype.h> /* to declare isdigit() */ - - -#if TRANSFORMS_SUPPORTED - -/* - * Lossless image transformation routines. These routines work on DCT - * coefficient arrays and thus do not require any lossy decompression - * or recompression of the image. - * Thanks to Guido Vollbeding for the initial design and code of this feature, - * and to Ben Jackson for introducing the cropping feature. - * - * Horizontal flipping is done in-place, using a single top-to-bottom - * pass through the virtual source array. It will thus be much the - * fastest option for images larger than main memory. - * - * The other routines require a set of destination virtual arrays, so they - * need twice as much memory as jpegtran normally does. The destination - * arrays are always written in normal scan order (top to bottom) because - * the virtual array manager expects this. The source arrays will be scanned - * in the corresponding order, which means multiple passes through the source - * arrays for most of the transforms. That could result in much thrashing - * if the image is larger than main memory. - * - * If cropping or trimming is involved, the destination arrays may be smaller - * than the source arrays. Note it is not possible to do horizontal flip - * in-place when a nonzero Y crop offset is specified, since we'd have to move - * data from one block row to another but the virtual array manager doesn't - * guarantee we can touch more than one row at a time. So in that case, - * we have to use a separate destination array. - * - * Some notes about the operating environment of the individual transform - * routines: - * 1. Both the source and destination virtual arrays are allocated from the - * source JPEG object, and therefore should be manipulated by calling the - * source's memory manager. - * 2. The destination's component count should be used. It may be smaller - * than the source's when forcing to grayscale. - * 3. Likewise the destination's sampling factors should be used. When - * forcing to grayscale the destination's sampling factors will be all 1, - * and we may as well take that as the effective iMCU size. - * 4. When "trim" is in effect, the destination's dimensions will be the - * trimmed values but the source's will be untrimmed. - * 5. When "crop" is in effect, the destination's dimensions will be the - * cropped values but the source's will be uncropped. Each transform - * routine is responsible for picking up source data starting at the - * correct X and Y offset for the crop region. (The X and Y offsets - * passed to the transform routines are measured in iMCU blocks of the - * destination.) - * 6. All the routines assume that the source and destination buffers are - * padded out to a full iMCU boundary. This is true, although for the - * source buffer it is an undocumented property of jdcoefct.c. - */ - - -LOCAL(void) -do_crop (j_decompress_ptr srcinfo, j_compress_ptr dstinfo, - JDIMENSION x_crop_offset, JDIMENSION y_crop_offset, - jvirt_barray_ptr *src_coef_arrays, - jvirt_barray_ptr *dst_coef_arrays) -/* Crop. This is only used when no rotate/flip is requested with the crop. */ -{ - JDIMENSION dst_blk_y, x_crop_blocks, y_crop_blocks; - int ci, offset_y; - JBLOCKARRAY src_buffer, dst_buffer; - jpeg_component_info *compptr; - - /* We simply have to copy the right amount of data (the destination's - * image size) starting at the given X and Y offsets in the source. - */ - for (ci = 0; ci < dstinfo->num_components; ci++) { - compptr = dstinfo->comp_info + ci; - x_crop_blocks = x_crop_offset * compptr->h_samp_factor; - y_crop_blocks = y_crop_offset * compptr->v_samp_factor; - for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks; - dst_blk_y += compptr->v_samp_factor) { - dst_buffer = (*srcinfo->mem->access_virt_barray) - ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y, - (JDIMENSION) compptr->v_samp_factor, TRUE); - src_buffer = (*srcinfo->mem->access_virt_barray) - ((j_common_ptr) srcinfo, src_coef_arrays[ci], - dst_blk_y + y_crop_blocks, - (JDIMENSION) compptr->v_samp_factor, FALSE); - for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) { - jcopy_block_row(src_buffer[offset_y] + x_crop_blocks, - dst_buffer[offset_y], - compptr->width_in_blocks); - } - } - } -} - - -LOCAL(void) -do_flip_h_no_crop (j_decompress_ptr srcinfo, j_compress_ptr dstinfo, - JDIMENSION x_crop_offset, - jvirt_barray_ptr *src_coef_arrays) -/* Horizontal flip; done in-place, so no separate dest array is required. - * NB: this only works when y_crop_offset is zero. - */ -{ - JDIMENSION MCU_cols, comp_width, blk_x, blk_y, x_crop_blocks; - int ci, k, offset_y; - JBLOCKARRAY buffer; - JCOEFPTR ptr1, ptr2; - JCOEF temp1, temp2; - jpeg_component_info *compptr; - - /* Horizontal mirroring of DCT blocks is accomplished by swapping - * pairs of blocks in-place. Within a DCT block, we perform horizontal - * mirroring by changing the signs of odd-numbered columns. - * Partial iMCUs at the right edge are left untouched. - */ - MCU_cols = srcinfo->output_width / - (dstinfo->max_h_samp_factor * dstinfo->min_DCT_h_scaled_size); - - for (ci = 0; ci < dstinfo->num_components; ci++) { - compptr = dstinfo->comp_info + ci; - comp_width = MCU_cols * compptr->h_samp_factor; - x_crop_blocks = x_crop_offset * compptr->h_samp_factor; - for (blk_y = 0; blk_y < compptr->height_in_blocks; - blk_y += compptr->v_samp_factor) { - buffer = (*srcinfo->mem->access_virt_barray) - ((j_common_ptr) srcinfo, src_coef_arrays[ci], blk_y, - (JDIMENSION) compptr->v_samp_factor, TRUE); - for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) { - /* Do the mirroring */ - for (blk_x = 0; blk_x * 2 < comp_width; blk_x++) { - ptr1 = buffer[offset_y][blk_x]; - ptr2 = buffer[offset_y][comp_width - blk_x - 1]; - /* this unrolled loop doesn't need to know which row it's on... */ - for (k = 0; k < DCTSIZE2; k += 2) { - temp1 = *ptr1; /* swap even column */ - temp2 = *ptr2; - *ptr1++ = temp2; - *ptr2++ = temp1; - temp1 = *ptr1; /* swap odd column with sign change */ - temp2 = *ptr2; - *ptr1++ = -temp2; - *ptr2++ = -temp1; - } - } - if (x_crop_blocks > 0) { - /* Now left-justify the portion of the data to be kept. - * We can't use a single jcopy_block_row() call because that routine - * depends on memcpy(), whose behavior is unspecified for overlapping - * source and destination areas. Sigh. - */ - for (blk_x = 0; blk_x < compptr->width_in_blocks; blk_x++) { - jcopy_block_row(buffer[offset_y] + blk_x + x_crop_blocks, - buffer[offset_y] + blk_x, - (JDIMENSION) 1); - } - } - } - } - } -} - - -LOCAL(void) -do_flip_h (j_decompress_ptr srcinfo, j_compress_ptr dstinfo, - JDIMENSION x_crop_offset, JDIMENSION y_crop_offset, - jvirt_barray_ptr *src_coef_arrays, - jvirt_barray_ptr *dst_coef_arrays) -/* Horizontal flip in general cropping case */ -{ - JDIMENSION MCU_cols, comp_width, dst_blk_x, dst_blk_y; - JDIMENSION x_crop_blocks, y_crop_blocks; - int ci, k, offset_y; - JBLOCKARRAY src_buffer, dst_buffer; - JBLOCKROW src_row_ptr, dst_row_ptr; - JCOEFPTR src_ptr, dst_ptr; - jpeg_component_info *compptr; - - /* Here we must output into a separate array because we can't touch - * different rows of a single virtual array simultaneously. Otherwise, - * this is essentially the same as the routine above. - */ - MCU_cols = srcinfo->output_width / - (dstinfo->max_h_samp_factor * dstinfo->min_DCT_h_scaled_size); - - for (ci = 0; ci < dstinfo->num_components; ci++) { - compptr = dstinfo->comp_info + ci; - comp_width = MCU_cols * compptr->h_samp_factor; - x_crop_blocks = x_crop_offset * compptr->h_samp_factor; - y_crop_blocks = y_crop_offset * compptr->v_samp_factor; - for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks; - dst_blk_y += compptr->v_samp_factor) { - dst_buffer = (*srcinfo->mem->access_virt_barray) - ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y, - (JDIMENSION) compptr->v_samp_factor, TRUE); - src_buffer = (*srcinfo->mem->access_virt_barray) - ((j_common_ptr) srcinfo, src_coef_arrays[ci], - dst_blk_y + y_crop_blocks, - (JDIMENSION) compptr->v_samp_factor, FALSE); - for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) { - dst_row_ptr = dst_buffer[offset_y]; - src_row_ptr = src_buffer[offset_y]; - for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks; dst_blk_x++) { - if (x_crop_blocks + dst_blk_x < comp_width) { - /* Do the mirrorable blocks */ - dst_ptr = dst_row_ptr[dst_blk_x]; - src_ptr = src_row_ptr[comp_width - x_crop_blocks - dst_blk_x - 1]; - /* this unrolled loop doesn't need to know which row it's on... */ - for (k = 0; k < DCTSIZE2; k += 2) { - *dst_ptr++ = *src_ptr++; /* copy even column */ - *dst_ptr++ = - *src_ptr++; /* copy odd column with sign change */ - } - } else { - /* Copy last partial block(s) verbatim */ - jcopy_block_row(src_row_ptr + dst_blk_x + x_crop_blocks, - dst_row_ptr + dst_blk_x, - (JDIMENSION) 1); - } - } - } - } - } -} - - -LOCAL(void) -do_flip_v (j_decompress_ptr srcinfo, j_compress_ptr dstinfo, - JDIMENSION x_crop_offset, JDIMENSION y_crop_offset, - jvirt_barray_ptr *src_coef_arrays, - jvirt_barray_ptr *dst_coef_arrays) -/* Vertical flip */ -{ - JDIMENSION MCU_rows, comp_height, dst_blk_x, dst_blk_y; - JDIMENSION x_crop_blocks, y_crop_blocks; - int ci, i, j, offset_y; - JBLOCKARRAY src_buffer, dst_buffer; - JBLOCKROW src_row_ptr, dst_row_ptr; - JCOEFPTR src_ptr, dst_ptr; - jpeg_component_info *compptr; - - /* We output into a separate array because we can't touch different - * rows of the source virtual array simultaneously. Otherwise, this - * is a pretty straightforward analog of horizontal flip. - * Within a DCT block, vertical mirroring is done by changing the signs - * of odd-numbered rows. - * Partial iMCUs at the bottom edge are copied verbatim. - */ - MCU_rows = srcinfo->output_height / - (dstinfo->max_v_samp_factor * dstinfo->min_DCT_v_scaled_size); - - for (ci = 0; ci < dstinfo->num_components; ci++) { - compptr = dstinfo->comp_info + ci; - comp_height = MCU_rows * compptr->v_samp_factor; - x_crop_blocks = x_crop_offset * compptr->h_samp_factor; - y_crop_blocks = y_crop_offset * compptr->v_samp_factor; - for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks; - dst_blk_y += compptr->v_samp_factor) { - dst_buffer = (*srcinfo->mem->access_virt_barray) - ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y, - (JDIMENSION) compptr->v_samp_factor, TRUE); - if (y_crop_blocks + dst_blk_y < comp_height) { - /* Row is within the mirrorable area. */ - src_buffer = (*srcinfo->mem->access_virt_barray) - ((j_common_ptr) srcinfo, src_coef_arrays[ci], - comp_height - y_crop_blocks - dst_blk_y - - (JDIMENSION) compptr->v_samp_factor, - (JDIMENSION) compptr->v_samp_factor, FALSE); - } else { - /* Bottom-edge blocks will be copied verbatim. */ - src_buffer = (*srcinfo->mem->access_virt_barray) - ((j_common_ptr) srcinfo, src_coef_arrays[ci], - dst_blk_y + y_crop_blocks, - (JDIMENSION) compptr->v_samp_factor, FALSE); - } - for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) { - if (y_crop_blocks + dst_blk_y < comp_height) { - /* Row is within the mirrorable area. */ - dst_row_ptr = dst_buffer[offset_y]; - src_row_ptr = src_buffer[compptr->v_samp_factor - offset_y - 1]; - src_row_ptr += x_crop_blocks; - for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks; - dst_blk_x++) { - dst_ptr = dst_row_ptr[dst_blk_x]; - src_ptr = src_row_ptr[dst_blk_x]; - for (i = 0; i < DCTSIZE; i += 2) { - /* copy even row */ - for (j = 0; j < DCTSIZE; j++) - *dst_ptr++ = *src_ptr++; - /* copy odd row with sign change */ - for (j = 0; j < DCTSIZE; j++) - *dst_ptr++ = - *src_ptr++; - } - } - } else { - /* Just copy row verbatim. */ - jcopy_block_row(src_buffer[offset_y] + x_crop_blocks, - dst_buffer[offset_y], - compptr->width_in_blocks); - } - } - } - } -} - - -LOCAL(void) -do_transpose (j_decompress_ptr srcinfo, j_compress_ptr dstinfo, - JDIMENSION x_crop_offset, JDIMENSION y_crop_offset, - jvirt_barray_ptr *src_coef_arrays, - jvirt_barray_ptr *dst_coef_arrays) -/* Transpose source into destination */ -{ - JDIMENSION dst_blk_x, dst_blk_y, x_crop_blocks, y_crop_blocks; - int ci, i, j, offset_x, offset_y; - JBLOCKARRAY src_buffer, dst_buffer; - JCOEFPTR src_ptr, dst_ptr; - jpeg_component_info *compptr; - - /* Transposing pixels within a block just requires transposing the - * DCT coefficients. - * Partial iMCUs at the edges require no special treatment; we simply - * process all the available DCT blocks for every component. - */ - for (ci = 0; ci < dstinfo->num_components; ci++) { - compptr = dstinfo->comp_info + ci; - x_crop_blocks = x_crop_offset * compptr->h_samp_factor; - y_crop_blocks = y_crop_offset * compptr->v_samp_factor; - for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks; - dst_blk_y += compptr->v_samp_factor) { - dst_buffer = (*srcinfo->mem->access_virt_barray) - ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y, - (JDIMENSION) compptr->v_samp_factor, TRUE); - for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) { - for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks; - dst_blk_x += compptr->h_samp_factor) { - src_buffer = (*srcinfo->mem->access_virt_barray) - ((j_common_ptr) srcinfo, src_coef_arrays[ci], - dst_blk_x + x_crop_blocks, - (JDIMENSION) compptr->h_samp_factor, FALSE); - for (offset_x = 0; offset_x < compptr->h_samp_factor; offset_x++) { - dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x]; - src_ptr = src_buffer[offset_x][dst_blk_y + offset_y + y_crop_blocks]; - for (i = 0; i < DCTSIZE; i++) - for (j = 0; j < DCTSIZE; j++) - dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j]; - } - } - } - } - } -} - - -LOCAL(void) -do_rot_90 (j_decompress_ptr srcinfo, j_compress_ptr dstinfo, - JDIMENSION x_crop_offset, JDIMENSION y_crop_offset, - jvirt_barray_ptr *src_coef_arrays, - jvirt_barray_ptr *dst_coef_arrays) -/* 90 degree rotation is equivalent to - * 1. Transposing the image; - * 2. Horizontal mirroring. - * These two steps are merged into a single processing routine. - */ -{ - JDIMENSION MCU_cols, comp_width, dst_blk_x, dst_blk_y; - JDIMENSION x_crop_blocks, y_crop_blocks; - int ci, i, j, offset_x, offset_y; - JBLOCKARRAY src_buffer, dst_buffer; - JCOEFPTR src_ptr, dst_ptr; - jpeg_component_info *compptr; - - /* Because of the horizontal mirror step, we can't process partial iMCUs - * at the (output) right edge properly. They just get transposed and - * not mirrored. - */ - MCU_cols = srcinfo->output_height / - (dstinfo->max_h_samp_factor * dstinfo->min_DCT_h_scaled_size); - - for (ci = 0; ci < dstinfo->num_components; ci++) { - compptr = dstinfo->comp_info + ci; - comp_width = MCU_cols * compptr->h_samp_factor; - x_crop_blocks = x_crop_offset * compptr->h_samp_factor; - y_crop_blocks = y_crop_offset * compptr->v_samp_factor; - for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks; - dst_blk_y += compptr->v_samp_factor) { - dst_buffer = (*srcinfo->mem->access_virt_barray) - ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y, - (JDIMENSION) compptr->v_samp_factor, TRUE); - for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) { - for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks; - dst_blk_x += compptr->h_samp_factor) { - if (x_crop_blocks + dst_blk_x < comp_width) { - /* Block is within the mirrorable area. */ - src_buffer = (*srcinfo->mem->access_virt_barray) - ((j_common_ptr) srcinfo, src_coef_arrays[ci], - comp_width - x_crop_blocks - dst_blk_x - - (JDIMENSION) compptr->h_samp_factor, - (JDIMENSION) compptr->h_samp_factor, FALSE); - } else { - /* Edge blocks are transposed but not mirrored. */ - src_buffer = (*srcinfo->mem->access_virt_barray) - ((j_common_ptr) srcinfo, src_coef_arrays[ci], - dst_blk_x + x_crop_blocks, - (JDIMENSION) compptr->h_samp_factor, FALSE); - } - for (offset_x = 0; offset_x < compptr->h_samp_factor; offset_x++) { - dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x]; - if (x_crop_blocks + dst_blk_x < comp_width) { - /* Block is within the mirrorable area. */ - src_ptr = src_buffer[compptr->h_samp_factor - offset_x - 1] - [dst_blk_y + offset_y + y_crop_blocks]; - for (i = 0; i < DCTSIZE; i++) { - for (j = 0; j < DCTSIZE; j++) - dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j]; - i++; - for (j = 0; j < DCTSIZE; j++) - dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j]; - } - } else { - /* Edge blocks are transposed but not mirrored. */ - src_ptr = src_buffer[offset_x] - [dst_blk_y + offset_y + y_crop_blocks]; - for (i = 0; i < DCTSIZE; i++) - for (j = 0; j < DCTSIZE; j++) - dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j]; - } - } - } - } - } - } -} - - -LOCAL(void) -do_rot_270 (j_decompress_ptr srcinfo, j_compress_ptr dstinfo, - JDIMENSION x_crop_offset, JDIMENSION y_crop_offset, - jvirt_barray_ptr *src_coef_arrays, - jvirt_barray_ptr *dst_coef_arrays) -/* 270 degree rotation is equivalent to - * 1. Horizontal mirroring; - * 2. Transposing the image. - * These two steps are merged into a single processing routine. - */ -{ - JDIMENSION MCU_rows, comp_height, dst_blk_x, dst_blk_y; - JDIMENSION x_crop_blocks, y_crop_blocks; - int ci, i, j, offset_x, offset_y; - JBLOCKARRAY src_buffer, dst_buffer; - JCOEFPTR src_ptr, dst_ptr; - jpeg_component_info *compptr; - - /* Because of the horizontal mirror step, we can't process partial iMCUs - * at the (output) bottom edge properly. They just get transposed and - * not mirrored. - */ - MCU_rows = srcinfo->output_width / - (dstinfo->max_v_samp_factor * dstinfo->min_DCT_v_scaled_size); - - for (ci = 0; ci < dstinfo->num_components; ci++) { - compptr = dstinfo->comp_info + ci; - comp_height = MCU_rows * compptr->v_samp_factor; - x_crop_blocks = x_crop_offset * compptr->h_samp_factor; - y_crop_blocks = y_crop_offset * compptr->v_samp_factor; - for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks; - dst_blk_y += compptr->v_samp_factor) { - dst_buffer = (*srcinfo->mem->access_virt_barray) - ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y, - (JDIMENSION) compptr->v_samp_factor, TRUE); - for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) { - for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks; - dst_blk_x += compptr->h_samp_factor) { - src_buffer = (*srcinfo->mem->access_virt_barray) - ((j_common_ptr) srcinfo, src_coef_arrays[ci], - dst_blk_x + x_crop_blocks, - (JDIMENSION) compptr->h_samp_factor, FALSE); - for (offset_x = 0; offset_x < compptr->h_samp_factor; offset_x++) { - dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x]; - if (y_crop_blocks + dst_blk_y < comp_height) { - /* Block is within the mirrorable area. */ - src_ptr = src_buffer[offset_x] - [comp_height - y_crop_blocks - dst_blk_y - offset_y - 1]; - for (i = 0; i < DCTSIZE; i++) { - for (j = 0; j < DCTSIZE; j++) { - dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j]; - j++; - dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j]; - } - } - } else { - /* Edge blocks are transposed but not mirrored. */ - src_ptr = src_buffer[offset_x] - [dst_blk_y + offset_y + y_crop_blocks]; - for (i = 0; i < DCTSIZE; i++) - for (j = 0; j < DCTSIZE; j++) - dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j]; - } - } - } - } - } - } -} - - -LOCAL(void) -do_rot_180 (j_decompress_ptr srcinfo, j_compress_ptr dstinfo, - JDIMENSION x_crop_offset, JDIMENSION y_crop_offset, - jvirt_barray_ptr *src_coef_arrays, - jvirt_barray_ptr *dst_coef_arrays) -/* 180 degree rotation is equivalent to - * 1. Vertical mirroring; - * 2. Horizontal mirroring. - * These two steps are merged into a single processing routine. - */ -{ - JDIMENSION MCU_cols, MCU_rows, comp_width, comp_height, dst_blk_x, dst_blk_y; - JDIMENSION x_crop_blocks, y_crop_blocks; - int ci, i, j, offset_y; - JBLOCKARRAY src_buffer, dst_buffer; - JBLOCKROW src_row_ptr, dst_row_ptr; - JCOEFPTR src_ptr, dst_ptr; - jpeg_component_info *compptr; - - MCU_cols = srcinfo->output_width / - (dstinfo->max_h_samp_factor * dstinfo->min_DCT_h_scaled_size); - MCU_rows = srcinfo->output_height / - (dstinfo->max_v_samp_factor * dstinfo->min_DCT_v_scaled_size); - - for (ci = 0; ci < dstinfo->num_components; ci++) { - compptr = dstinfo->comp_info + ci; - comp_width = MCU_cols * compptr->h_samp_factor; - comp_height = MCU_rows * compptr->v_samp_factor; - x_crop_blocks = x_crop_offset * compptr->h_samp_factor; - y_crop_blocks = y_crop_offset * compptr->v_samp_factor; - for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks; - dst_blk_y += compptr->v_samp_factor) { - dst_buffer = (*srcinfo->mem->access_virt_barray) - ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y, - (JDIMENSION) compptr->v_samp_factor, TRUE); - if (y_crop_blocks + dst_blk_y < comp_height) { - /* Row is within the vertically mirrorable area. */ - src_buffer = (*srcinfo->mem->access_virt_barray) - ((j_common_ptr) srcinfo, src_coef_arrays[ci], - comp_height - y_crop_blocks - dst_blk_y - - (JDIMENSION) compptr->v_samp_factor, - (JDIMENSION) compptr->v_samp_factor, FALSE); - } else { - /* Bottom-edge rows are only mirrored horizontally. */ - src_buffer = (*srcinfo->mem->access_virt_barray) - ((j_common_ptr) srcinfo, src_coef_arrays[ci], - dst_blk_y + y_crop_blocks, - (JDIMENSION) compptr->v_samp_factor, FALSE); - } - for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) { - dst_row_ptr = dst_buffer[offset_y]; - if (y_crop_blocks + dst_blk_y < comp_height) { - /* Row is within the mirrorable area. */ - src_row_ptr = src_buffer[compptr->v_samp_factor - offset_y - 1]; - for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks; dst_blk_x++) { - dst_ptr = dst_row_ptr[dst_blk_x]; - if (x_crop_blocks + dst_blk_x < comp_width) { - /* Process the blocks that can be mirrored both ways. */ - src_ptr = src_row_ptr[comp_width - x_crop_blocks - dst_blk_x - 1]; - for (i = 0; i < DCTSIZE; i += 2) { - /* For even row, negate every odd column. */ - for (j = 0; j < DCTSIZE; j += 2) { - *dst_ptr++ = *src_ptr++; - *dst_ptr++ = - *src_ptr++; - } - /* For odd row, negate every even column. */ - for (j = 0; j < DCTSIZE; j += 2) { - *dst_ptr++ = - *src_ptr++; - *dst_ptr++ = *src_ptr++; - } - } - } else { - /* Any remaining right-edge blocks are only mirrored vertically. */ - src_ptr = src_row_ptr[x_crop_blocks + dst_blk_x]; - for (i = 0; i < DCTSIZE; i += 2) { - for (j = 0; j < DCTSIZE; j++) - *dst_ptr++ = *src_ptr++; - for (j = 0; j < DCTSIZE; j++) - *dst_ptr++ = - *src_ptr++; - } - } - } - } else { - /* Remaining rows are just mirrored horizontally. */ - src_row_ptr = src_buffer[offset_y]; - for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks; dst_blk_x++) { - if (x_crop_blocks + dst_blk_x < comp_width) { - /* Process the blocks that can be mirrored. */ - dst_ptr = dst_row_ptr[dst_blk_x]; - src_ptr = src_row_ptr[comp_width - x_crop_blocks - dst_blk_x - 1]; - for (i = 0; i < DCTSIZE2; i += 2) { - *dst_ptr++ = *src_ptr++; - *dst_ptr++ = - *src_ptr++; - } - } else { - /* Any remaining right-edge blocks are only copied. */ - jcopy_block_row(src_row_ptr + dst_blk_x + x_crop_blocks, - dst_row_ptr + dst_blk_x, - (JDIMENSION) 1); - } - } - } - } - } - } -} - - -LOCAL(void) -do_transverse (j_decompress_ptr srcinfo, j_compress_ptr dstinfo, - JDIMENSION x_crop_offset, JDIMENSION y_crop_offset, - jvirt_barray_ptr *src_coef_arrays, - jvirt_barray_ptr *dst_coef_arrays) -/* Transverse transpose is equivalent to - * 1. 180 degree rotation; - * 2. Transposition; - * or - * 1. Horizontal mirroring; - * 2. Transposition; - * 3. Horizontal mirroring. - * These steps are merged into a single processing routine. - */ -{ - JDIMENSION MCU_cols, MCU_rows, comp_width, comp_height, dst_blk_x, dst_blk_y; - JDIMENSION x_crop_blocks, y_crop_blocks; - int ci, i, j, offset_x, offset_y; - JBLOCKARRAY src_buffer, dst_buffer; - JCOEFPTR src_ptr, dst_ptr; - jpeg_component_info *compptr; - - MCU_cols = srcinfo->output_height / - (dstinfo->max_h_samp_factor * dstinfo->min_DCT_h_scaled_size); - MCU_rows = srcinfo->output_width / - (dstinfo->max_v_samp_factor * dstinfo->min_DCT_v_scaled_size); - - for (ci = 0; ci < dstinfo->num_components; ci++) { - compptr = dstinfo->comp_info + ci; - comp_width = MCU_cols * compptr->h_samp_factor; - comp_height = MCU_rows * compptr->v_samp_factor; - x_crop_blocks = x_crop_offset * compptr->h_samp_factor; - y_crop_blocks = y_crop_offset * compptr->v_samp_factor; - for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks; - dst_blk_y += compptr->v_samp_factor) { - dst_buffer = (*srcinfo->mem->access_virt_barray) - ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y, - (JDIMENSION) compptr->v_samp_factor, TRUE); - for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) { - for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks; - dst_blk_x += compptr->h_samp_factor) { - if (x_crop_blocks + dst_blk_x < comp_width) { - /* Block is within the mirrorable area. */ - src_buffer = (*srcinfo->mem->access_virt_barray) - ((j_common_ptr) srcinfo, src_coef_arrays[ci], - comp_width - x_crop_blocks - dst_blk_x - - (JDIMENSION) compptr->h_samp_factor, - (JDIMENSION) compptr->h_samp_factor, FALSE); - } else { - src_buffer = (*srcinfo->mem->access_virt_barray) - ((j_common_ptr) srcinfo, src_coef_arrays[ci], - dst_blk_x + x_crop_blocks, - (JDIMENSION) compptr->h_samp_factor, FALSE); - } - for (offset_x = 0; offset_x < compptr->h_samp_factor; offset_x++) { - dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x]; - if (y_crop_blocks + dst_blk_y < comp_height) { - if (x_crop_blocks + dst_blk_x < comp_width) { - /* Block is within the mirrorable area. */ - src_ptr = src_buffer[compptr->h_samp_factor - offset_x - 1] - [comp_height - y_crop_blocks - dst_blk_y - offset_y - 1]; - for (i = 0; i < DCTSIZE; i++) { - for (j = 0; j < DCTSIZE; j++) { - dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j]; - j++; - dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j]; - } - i++; - for (j = 0; j < DCTSIZE; j++) { - dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j]; - j++; - dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j]; - } - } - } else { - /* Right-edge blocks are mirrored in y only */ - src_ptr = src_buffer[offset_x] - [comp_height - y_crop_blocks - dst_blk_y - offset_y - 1]; - for (i = 0; i < DCTSIZE; i++) { - for (j = 0; j < DCTSIZE; j++) { - dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j]; - j++; - dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j]; - } - } - } - } else { - if (x_crop_blocks + dst_blk_x < comp_width) { - /* Bottom-edge blocks are mirrored in x only */ - src_ptr = src_buffer[compptr->h_samp_factor - offset_x - 1] - [dst_blk_y + offset_y + y_crop_blocks]; - for (i = 0; i < DCTSIZE; i++) { - for (j = 0; j < DCTSIZE; j++) - dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j]; - i++; - for (j = 0; j < DCTSIZE; j++) - dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j]; - } - } else { - /* At lower right corner, just transpose, no mirroring */ - src_ptr = src_buffer[offset_x] - [dst_blk_y + offset_y + y_crop_blocks]; - for (i = 0; i < DCTSIZE; i++) - for (j = 0; j < DCTSIZE; j++) - dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j]; - } - } - } - } - } - } - } -} - - -/* Parse an unsigned integer: subroutine for jtransform_parse_crop_spec. - * Returns TRUE if valid integer found, FALSE if not. - * *strptr is advanced over the digit string, and *result is set to its value. - */ - -LOCAL(boolean) -jt_read_integer (const char ** strptr, JDIMENSION * result) -{ - const char * ptr = *strptr; - JDIMENSION val = 0; - - for (; isdigit(*ptr); ptr++) { - val = val * 10 + (JDIMENSION) (*ptr - '0'); - } - *result = val; - if (ptr == *strptr) - return FALSE; /* oops, no digits */ - *strptr = ptr; - return TRUE; -} - - -/* Parse a crop specification (written in X11 geometry style). - * The routine returns TRUE if the spec string is valid, FALSE if not. - * - * The crop spec string should have the format - * <width>[f]x<height>[f]{+-}<xoffset>{+-}<yoffset> - * where width, height, xoffset, and yoffset are unsigned integers. - * Each of the elements can be omitted to indicate a default value. - * (A weakness of this style is that it is not possible to omit xoffset - * while specifying yoffset, since they look alike.) - * - * This code is loosely based on XParseGeometry from the X11 distribution. - */ - -GLOBAL(boolean) -jtransform_parse_crop_spec (jpeg_transform_info *info, const char *spec) -{ - info->crop = FALSE; - info->crop_width_set = JCROP_UNSET; - info->crop_height_set = JCROP_UNSET; - info->crop_xoffset_set = JCROP_UNSET; - info->crop_yoffset_set = JCROP_UNSET; - - if (isdigit(*spec)) { - /* fetch width */ - if (! jt_read_integer(&spec, &info->crop_width)) - return FALSE; - if (*spec == 'f' || *spec == 'F') { - spec++; - info->crop_width_set = JCROP_FORCE; - } else - info->crop_width_set = JCROP_POS; - } - if (*spec == 'x' || *spec == 'X') { - /* fetch height */ - spec++; - if (! jt_read_integer(&spec, &info->crop_height)) - return FALSE; - if (*spec == 'f' || *spec == 'F') { - spec++; - info->crop_height_set = JCROP_FORCE; - } else - info->crop_height_set = JCROP_POS; - } - if (*spec == '+' || *spec == '-') { - /* fetch xoffset */ - info->crop_xoffset_set = (*spec == '-') ? JCROP_NEG : JCROP_POS; - spec++; - if (! jt_read_integer(&spec, &info->crop_xoffset)) - return FALSE; - } - if (*spec == '+' || *spec == '-') { - /* fetch yoffset */ - info->crop_yoffset_set = (*spec == '-') ? JCROP_NEG : JCROP_POS; - spec++; - if (! jt_read_integer(&spec, &info->crop_yoffset)) - return FALSE; - } - /* We had better have gotten to the end of the string. */ - if (*spec != '\0') - return FALSE; - info->crop = TRUE; - return TRUE; -} - - -/* Trim off any partial iMCUs on the indicated destination edge */ - -LOCAL(void) -trim_right_edge (jpeg_transform_info *info, JDIMENSION full_width) -{ - JDIMENSION MCU_cols; - - MCU_cols = info->output_width / info->iMCU_sample_width; - if (MCU_cols > 0 && info->x_crop_offset + MCU_cols == - full_width / info->iMCU_sample_width) - info->output_width = MCU_cols * info->iMCU_sample_width; -} - -LOCAL(void) -trim_bottom_edge (jpeg_transform_info *info, JDIMENSION full_height) -{ - JDIMENSION MCU_rows; - - MCU_rows = info->output_height / info->iMCU_sample_height; - if (MCU_rows > 0 && info->y_crop_offset + MCU_rows == - full_height / info->iMCU_sample_height) - info->output_height = MCU_rows * info->iMCU_sample_height; -} - - -/* Request any required workspace. - * - * This routine figures out the size that the output image will be - * (which implies that all the transform parameters must be set before - * it is called). - * - * We allocate the workspace virtual arrays from the source decompression - * object, so that all the arrays (both the original data and the workspace) - * will be taken into account while making memory management decisions. - * Hence, this routine must be called after jpeg_read_header (which reads - * the image dimensions) and before jpeg_read_coefficients (which realizes - * the source's virtual arrays). - * - * This function returns FALSE right away if -perfect is given - * and transformation is not perfect. Otherwise returns TRUE. - */ - -GLOBAL(boolean) -jtransform_request_workspace (j_decompress_ptr srcinfo, - jpeg_transform_info *info) -{ - jvirt_barray_ptr *coef_arrays; - boolean need_workspace, transpose_it; - jpeg_component_info *compptr; - JDIMENSION xoffset, yoffset; - JDIMENSION width_in_iMCUs, height_in_iMCUs; - JDIMENSION width_in_blocks, height_in_blocks; - int ci, h_samp_factor, v_samp_factor; - - /* Determine number of components in output image */ - if (info->force_grayscale && - srcinfo->jpeg_color_space == JCS_YCbCr && - srcinfo->num_components == 3) - /* We'll only process the first component */ - info->num_components = 1; - else - /* Process all the components */ - info->num_components = srcinfo->num_components; - - /* Compute output image dimensions and related values. */ - jpeg_core_output_dimensions(srcinfo); - - /* Return right away if -perfect is given and transformation is not perfect. - */ - if (info->perfect) { - if (info->num_components == 1) { - if (!jtransform_perfect_transform(srcinfo->output_width, - srcinfo->output_height, - srcinfo->min_DCT_h_scaled_size, - srcinfo->min_DCT_v_scaled_size, - info->transform)) - return FALSE; - } else { - if (!jtransform_perfect_transform(srcinfo->output_width, - srcinfo->output_height, - srcinfo->max_h_samp_factor * srcinfo->min_DCT_h_scaled_size, - srcinfo->max_v_samp_factor * srcinfo->min_DCT_v_scaled_size, - info->transform)) - return FALSE; - } - } - - /* If there is only one output component, force the iMCU size to be 1; - * else use the source iMCU size. (This allows us to do the right thing - * when reducing color to grayscale, and also provides a handy way of - * cleaning up "funny" grayscale images whose sampling factors are not 1x1.) - */ - switch (info->transform) { - case JXFORM_TRANSPOSE: - case JXFORM_TRANSVERSE: - case JXFORM_ROT_90: - case JXFORM_ROT_270: - info->output_width = srcinfo->output_height; - info->output_height = srcinfo->output_width; - if (info->num_components == 1) { - info->iMCU_sample_width = srcinfo->min_DCT_v_scaled_size; - info->iMCU_sample_height = srcinfo->min_DCT_h_scaled_size; - } else { - info->iMCU_sample_width = - srcinfo->max_v_samp_factor * srcinfo->min_DCT_v_scaled_size; - info->iMCU_sample_height = - srcinfo->max_h_samp_factor * srcinfo->min_DCT_h_scaled_size; - } - break; - default: - info->output_width = srcinfo->output_width; - info->output_height = srcinfo->output_height; - if (info->num_components == 1) { - info->iMCU_sample_width = srcinfo->min_DCT_h_scaled_size; - info->iMCU_sample_height = srcinfo->min_DCT_v_scaled_size; - } else { - info->iMCU_sample_width = - srcinfo->max_h_samp_factor * srcinfo->min_DCT_h_scaled_size; - info->iMCU_sample_height = - srcinfo->max_v_samp_factor * srcinfo->min_DCT_v_scaled_size; - } - break; - } - - /* If cropping has been requested, compute the crop area's position and - * dimensions, ensuring that its upper left corner falls at an iMCU boundary. - */ - if (info->crop) { - /* Insert default values for unset crop parameters */ - if (info->crop_xoffset_set == JCROP_UNSET) - info->crop_xoffset = 0; /* default to +0 */ - if (info->crop_yoffset_set == JCROP_UNSET) - info->crop_yoffset = 0; /* default to +0 */ - if (info->crop_xoffset >= info->output_width || - info->crop_yoffset >= info->output_height) - ERREXIT(srcinfo, JERR_BAD_CROP_SPEC); - if (info->crop_width_set == JCROP_UNSET) - info->crop_width = info->output_width - info->crop_xoffset; - if (info->crop_height_set == JCROP_UNSET) - info->crop_height = info->output_height - info->crop_yoffset; - /* Ensure parameters are valid */ - if (info->crop_width <= 0 || info->crop_width > info->output_width || - info->crop_height <= 0 || info->crop_height > info->output_height || - info->crop_xoffset > info->output_width - info->crop_width || - info->crop_yoffset > info->output_height - info->crop_height) - ERREXIT(srcinfo, JERR_BAD_CROP_SPEC); - /* Convert negative crop offsets into regular offsets */ - if (info->crop_xoffset_set == JCROP_NEG) - xoffset = info->output_width - info->crop_width - info->crop_xoffset; - else - xoffset = info->crop_xoffset; - if (info->crop_yoffset_set == JCROP_NEG) - yoffset = info->output_height - info->crop_height - info->crop_yoffset; - else - yoffset = info->crop_yoffset; - /* Now adjust so that upper left corner falls at an iMCU boundary */ - if (info->crop_width_set == JCROP_FORCE) - info->output_width = info->crop_width; - else - info->output_width = - info->crop_width + (xoffset % info->iMCU_sample_width); - if (info->crop_height_set == JCROP_FORCE) - info->output_height = info->crop_height; - else - info->output_height = - info->crop_height + (yoffset % info->iMCU_sample_height); - /* Save x/y offsets measured in iMCUs */ - info->x_crop_offset = xoffset / info->iMCU_sample_width; - info->y_crop_offset = yoffset / info->iMCU_sample_height; - } else { - info->x_crop_offset = 0; - info->y_crop_offset = 0; - } - - /* Figure out whether we need workspace arrays, - * and if so whether they are transposed relative to the source. - */ - need_workspace = FALSE; - transpose_it = FALSE; - switch (info->transform) { - case JXFORM_NONE: - if (info->x_crop_offset != 0 || info->y_crop_offset != 0) - need_workspace = TRUE; - /* No workspace needed if neither cropping nor transforming */ - break; - case JXFORM_FLIP_H: - if (info->trim) - trim_right_edge(info, srcinfo->output_width); - if (info->y_crop_offset != 0) - need_workspace = TRUE; - /* do_flip_h_no_crop doesn't need a workspace array */ - break; - case JXFORM_FLIP_V: - if (info->trim) - trim_bottom_edge(info, srcinfo->output_height); - /* Need workspace arrays having same dimensions as source image. */ - need_workspace = TRUE; - break; - case JXFORM_TRANSPOSE: - /* transpose does NOT have to trim anything */ - /* Need workspace arrays having transposed dimensions. */ - need_workspace = TRUE; - transpose_it = TRUE; - break; - case JXFORM_TRANSVERSE: - if (info->trim) { - trim_right_edge(info, srcinfo->output_height); - trim_bottom_edge(info, srcinfo->output_width); - } - /* Need workspace arrays having transposed dimensions. */ - need_workspace = TRUE; - transpose_it = TRUE; - break; - case JXFORM_ROT_90: - if (info->trim) - trim_right_edge(info, srcinfo->output_height); - /* Need workspace arrays having transposed dimensions. */ - need_workspace = TRUE; - transpose_it = TRUE; - break; - case JXFORM_ROT_180: - if (info->trim) { - trim_right_edge(info, srcinfo->output_width); - trim_bottom_edge(info, srcinfo->output_height); - } - /* Need workspace arrays having same dimensions as source image. */ - need_workspace = TRUE; - break; - case JXFORM_ROT_270: - if (info->trim) - trim_bottom_edge(info, srcinfo->output_width); - /* Need workspace arrays having transposed dimensions. */ - need_workspace = TRUE; - transpose_it = TRUE; - break; - } - - /* Allocate workspace if needed. - * Note that we allocate arrays padded out to the next iMCU boundary, - * so that transform routines need not worry about missing edge blocks. - */ - if (need_workspace) { - coef_arrays = (jvirt_barray_ptr *) - (*srcinfo->mem->alloc_small) ((j_common_ptr) srcinfo, JPOOL_IMAGE, - SIZEOF(jvirt_barray_ptr) * info->num_components); - width_in_iMCUs = (JDIMENSION) - jdiv_round_up((long) info->output_width, - (long) info->iMCU_sample_width); - height_in_iMCUs = (JDIMENSION) - jdiv_round_up((long) info->output_height, - (long) info->iMCU_sample_height); - for (ci = 0; ci < info->num_components; ci++) { - compptr = srcinfo->comp_info + ci; - if (info->num_components == 1) { - /* we're going to force samp factors to 1x1 in this case */ - h_samp_factor = v_samp_factor = 1; - } else if (transpose_it) { - h_samp_factor = compptr->v_samp_factor; - v_samp_factor = compptr->h_samp_factor; - } else { - h_samp_factor = compptr->h_samp_factor; - v_samp_factor = compptr->v_samp_factor; - } - width_in_blocks = width_in_iMCUs * h_samp_factor; - height_in_blocks = height_in_iMCUs * v_samp_factor; - coef_arrays[ci] = (*srcinfo->mem->request_virt_barray) - ((j_common_ptr) srcinfo, JPOOL_IMAGE, FALSE, - width_in_blocks, height_in_blocks, (JDIMENSION) v_samp_factor); - } - info->workspace_coef_arrays = coef_arrays; - } else - info->workspace_coef_arrays = NULL; - - return TRUE; -} - - -/* Transpose destination image parameters */ - -LOCAL(void) -transpose_critical_parameters (j_compress_ptr dstinfo) -{ - int tblno, i, j, ci, itemp; - jpeg_component_info *compptr; - JQUANT_TBL *qtblptr; - JDIMENSION jtemp; - UINT16 qtemp; - - /* Transpose image dimensions */ - jtemp = dstinfo->image_width; - dstinfo->image_width = dstinfo->image_height; - dstinfo->image_height = jtemp; - itemp = dstinfo->min_DCT_h_scaled_size; - dstinfo->min_DCT_h_scaled_size = dstinfo->min_DCT_v_scaled_size; - dstinfo->min_DCT_v_scaled_size = itemp; - - /* Transpose sampling factors */ - for (ci = 0; ci < dstinfo->num_components; ci++) { - compptr = dstinfo->comp_info + ci; - itemp = compptr->h_samp_factor; - compptr->h_samp_factor = compptr->v_samp_factor; - compptr->v_samp_factor = itemp; - } - - /* Transpose quantization tables */ - for (tblno = 0; tblno < NUM_QUANT_TBLS; tblno++) { - qtblptr = dstinfo->quant_tbl_ptrs[tblno]; - if (qtblptr != NULL) { - for (i = 0; i < DCTSIZE; i++) { - for (j = 0; j < i; j++) { - qtemp = qtblptr->quantval[i*DCTSIZE+j]; - qtblptr->quantval[i*DCTSIZE+j] = qtblptr->quantval[j*DCTSIZE+i]; - qtblptr->quantval[j*DCTSIZE+i] = qtemp; - } - } - } - } -} - - -/* Adjust Exif image parameters. - * - * We try to adjust the Tags ExifImageWidth and ExifImageHeight if possible. - */ - -LOCAL(void) -adjust_exif_parameters (JOCTET FAR * data, unsigned int length, - JDIMENSION new_width, JDIMENSION new_height) -{ - boolean is_motorola; /* Flag for byte order */ - unsigned int number_of_tags, tagnum; - unsigned int firstoffset, offset; - JDIMENSION new_value; - - if (length < 12) return; /* Length of an IFD entry */ - - /* Discover byte order */ - if (GETJOCTET(data[0]) == 0x49 && GETJOCTET(data[1]) == 0x49) - is_motorola = FALSE; - else if (GETJOCTET(data[0]) == 0x4D && GETJOCTET(data[1]) == 0x4D) - is_motorola = TRUE; - else - return; - - /* Check Tag Mark */ - if (is_motorola) { - if (GETJOCTET(data[2]) != 0) return; - if (GETJOCTET(data[3]) != 0x2A) return; - } else { - if (GETJOCTET(data[3]) != 0) return; - if (GETJOCTET(data[2]) != 0x2A) return; - } - - /* Get first IFD offset (offset to IFD0) */ - if (is_motorola) { - if (GETJOCTET(data[4]) != 0) return; - if (GETJOCTET(data[5]) != 0) return; - firstoffset = GETJOCTET(data[6]); - firstoffset <<= 8; - firstoffset += GETJOCTET(data[7]); - } else { - if (GETJOCTET(data[7]) != 0) return; - if (GETJOCTET(data[6]) != 0) return; - firstoffset = GETJOCTET(data[5]); - firstoffset <<= 8; - firstoffset += GETJOCTET(data[4]); - } - if (firstoffset > length - 2) return; /* check end of data segment */ - - /* Get the number of directory entries contained in this IFD */ - if (is_motorola) { - number_of_tags = GETJOCTET(data[firstoffset]); - number_of_tags <<= 8; - number_of_tags += GETJOCTET(data[firstoffset+1]); - } else { - number_of_tags = GETJOCTET(data[firstoffset+1]); - number_of_tags <<= 8; - number_of_tags += GETJOCTET(data[firstoffset]); - } - if (number_of_tags == 0) return; - firstoffset += 2; - - /* Search for ExifSubIFD offset Tag in IFD0 */ - for (;;) { - if (firstoffset > length - 12) return; /* check end of data segment */ - /* Get Tag number */ - if (is_motorola) { - tagnum = GETJOCTET(data[firstoffset]); - tagnum <<= 8; - tagnum += GETJOCTET(data[firstoffset+1]); - } else { - tagnum = GETJOCTET(data[firstoffset+1]); - tagnum <<= 8; - tagnum += GETJOCTET(data[firstoffset]); - } - if (tagnum == 0x8769) break; /* found ExifSubIFD offset Tag */ - if (--number_of_tags == 0) return; - firstoffset += 12; - } - - /* Get the ExifSubIFD offset */ - if (is_motorola) { - if (GETJOCTET(data[firstoffset+8]) != 0) return; - if (GETJOCTET(data[firstoffset+9]) != 0) return; - offset = GETJOCTET(data[firstoffset+10]); - offset <<= 8; - offset += GETJOCTET(data[firstoffset+11]); - } else { - if (GETJOCTET(data[firstoffset+11]) != 0) return; - if (GETJOCTET(data[firstoffset+10]) != 0) return; - offset = GETJOCTET(data[firstoffset+9]); - offset <<= 8; - offset += GETJOCTET(data[firstoffset+8]); - } - if (offset > length - 2) return; /* check end of data segment */ - - /* Get the number of directory entries contained in this SubIFD */ - if (is_motorola) { - number_of_tags = GETJOCTET(data[offset]); - number_of_tags <<= 8; - number_of_tags += GETJOCTET(data[offset+1]); - } else { - number_of_tags = GETJOCTET(data[offset+1]); - number_of_tags <<= 8; - number_of_tags += GETJOCTET(data[offset]); - } - if (number_of_tags < 2) return; - offset += 2; - - /* Search for ExifImageWidth and ExifImageHeight Tags in this SubIFD */ - do { - if (offset > length - 12) return; /* check end of data segment */ - /* Get Tag number */ - if (is_motorola) { - tagnum = GETJOCTET(data[offset]); - tagnum <<= 8; - tagnum += GETJOCTET(data[offset+1]); - } else { - tagnum = GETJOCTET(data[offset+1]); - tagnum <<= 8; - tagnum += GETJOCTET(data[offset]); - } - if (tagnum == 0xA002 || tagnum == 0xA003) { - if (tagnum == 0xA002) - new_value = new_width; /* ExifImageWidth Tag */ - else - new_value = new_height; /* ExifImageHeight Tag */ - if (is_motorola) { - data[offset+2] = 0; /* Format = unsigned long (4 octets) */ - data[offset+3] = 4; - data[offset+4] = 0; /* Number Of Components = 1 */ - data[offset+5] = 0; - data[offset+6] = 0; - data[offset+7] = 1; - data[offset+8] = 0; - data[offset+9] = 0; - data[offset+10] = (JOCTET)((new_value >> 8) & 0xFF); - data[offset+11] = (JOCTET)(new_value & 0xFF); - } else { - data[offset+2] = 4; /* Format = unsigned long (4 octets) */ - data[offset+3] = 0; - data[offset+4] = 1; /* Number Of Components = 1 */ - data[offset+5] = 0; - data[offset+6] = 0; - data[offset+7] = 0; - data[offset+8] = (JOCTET)(new_value & 0xFF); - data[offset+9] = (JOCTET)((new_value >> 8) & 0xFF); - data[offset+10] = 0; - data[offset+11] = 0; - } - } - offset += 12; - } while (--number_of_tags); -} - - -/* Adjust output image parameters as needed. - * - * This must be called after jpeg_copy_critical_parameters() - * and before jpeg_write_coefficients(). - * - * The return value is the set of virtual coefficient arrays to be written - * (either the ones allocated by jtransform_request_workspace, or the - * original source data arrays). The caller will need to pass this value - * to jpeg_write_coefficients(). - */ - -GLOBAL(jvirt_barray_ptr *) -jtransform_adjust_parameters (j_decompress_ptr srcinfo, - j_compress_ptr dstinfo, - jvirt_barray_ptr *src_coef_arrays, - jpeg_transform_info *info) -{ - /* If force-to-grayscale is requested, adjust destination parameters */ - if (info->force_grayscale) { - /* First, ensure we have YCbCr or grayscale data, and that the source's - * Y channel is full resolution. (No reasonable person would make Y - * be less than full resolution, so actually coping with that case - * isn't worth extra code space. But we check it to avoid crashing.) - */ - if (((dstinfo->jpeg_color_space == JCS_YCbCr && - dstinfo->num_components == 3) || - (dstinfo->jpeg_color_space == JCS_GRAYSCALE && - dstinfo->num_components == 1)) && - srcinfo->comp_info[0].h_samp_factor == srcinfo->max_h_samp_factor && - srcinfo->comp_info[0].v_samp_factor == srcinfo->max_v_samp_factor) { - /* We use jpeg_set_colorspace to make sure subsidiary settings get fixed - * properly. Among other things, it sets the target h_samp_factor & - * v_samp_factor to 1, which typically won't match the source. - * We have to preserve the source's quantization table number, however. - */ - int sv_quant_tbl_no = dstinfo->comp_info[0].quant_tbl_no; - jpeg_set_colorspace(dstinfo, JCS_GRAYSCALE); - dstinfo->comp_info[0].quant_tbl_no = sv_quant_tbl_no; - } else { - /* Sorry, can't do it */ - ERREXIT(dstinfo, JERR_CONVERSION_NOTIMPL); - } - } else if (info->num_components == 1) { - /* For a single-component source, we force the destination sampling factors - * to 1x1, with or without force_grayscale. This is useful because some - * decoders choke on grayscale images with other sampling factors. - */ - dstinfo->comp_info[0].h_samp_factor = 1; - dstinfo->comp_info[0].v_samp_factor = 1; - } - - /* Correct the destination's image dimensions as necessary - * for rotate/flip, resize, and crop operations. - */ - dstinfo->jpeg_width = info->output_width; - dstinfo->jpeg_height = info->output_height; - - /* Transpose destination image parameters */ - switch (info->transform) { - case JXFORM_TRANSPOSE: - case JXFORM_TRANSVERSE: - case JXFORM_ROT_90: - case JXFORM_ROT_270: - transpose_critical_parameters(dstinfo); - break; - default: - break; - } - - /* Adjust Exif properties */ - if (srcinfo->marker_list != NULL && - srcinfo->marker_list->marker == JPEG_APP0+1 && - srcinfo->marker_list->data_length >= 6 && - GETJOCTET(srcinfo->marker_list->data[0]) == 0x45 && - GETJOCTET(srcinfo->marker_list->data[1]) == 0x78 && - GETJOCTET(srcinfo->marker_list->data[2]) == 0x69 && - GETJOCTET(srcinfo->marker_list->data[3]) == 0x66 && - GETJOCTET(srcinfo->marker_list->data[4]) == 0 && - GETJOCTET(srcinfo->marker_list->data[5]) == 0) { - /* Suppress output of JFIF marker */ - dstinfo->write_JFIF_header = FALSE; - /* Adjust Exif image parameters */ - if (dstinfo->jpeg_width != srcinfo->image_width || - dstinfo->jpeg_height != srcinfo->image_height) - /* Align data segment to start of TIFF structure for parsing */ - adjust_exif_parameters(srcinfo->marker_list->data + 6, - srcinfo->marker_list->data_length - 6, - dstinfo->jpeg_width, dstinfo->jpeg_height); - } - - /* Return the appropriate output data set */ - if (info->workspace_coef_arrays != NULL) - return info->workspace_coef_arrays; - return src_coef_arrays; -} - - -/* Execute the actual transformation, if any. - * - * This must be called *after* jpeg_write_coefficients, because it depends - * on jpeg_write_coefficients to have computed subsidiary values such as - * the per-component width and height fields in the destination object. - * - * Note that some transformations will modify the source data arrays! - */ - -GLOBAL(void) -jtransform_execute_transform (j_decompress_ptr srcinfo, - j_compress_ptr dstinfo, - jvirt_barray_ptr *src_coef_arrays, - jpeg_transform_info *info) -{ - jvirt_barray_ptr *dst_coef_arrays = info->workspace_coef_arrays; - - /* Note: conditions tested here should match those in switch statement - * in jtransform_request_workspace() - */ - switch (info->transform) { - case JXFORM_NONE: - if (info->x_crop_offset != 0 || info->y_crop_offset != 0) - do_crop(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset, - src_coef_arrays, dst_coef_arrays); - break; - case JXFORM_FLIP_H: - if (info->y_crop_offset != 0) - do_flip_h(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset, - src_coef_arrays, dst_coef_arrays); - else - do_flip_h_no_crop(srcinfo, dstinfo, info->x_crop_offset, - src_coef_arrays); - break; - case JXFORM_FLIP_V: - do_flip_v(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset, - src_coef_arrays, dst_coef_arrays); - break; - case JXFORM_TRANSPOSE: - do_transpose(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset, - src_coef_arrays, dst_coef_arrays); - break; - case JXFORM_TRANSVERSE: - do_transverse(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset, - src_coef_arrays, dst_coef_arrays); - break; - case JXFORM_ROT_90: - do_rot_90(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset, - src_coef_arrays, dst_coef_arrays); - break; - case JXFORM_ROT_180: - do_rot_180(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset, - src_coef_arrays, dst_coef_arrays); - break; - case JXFORM_ROT_270: - do_rot_270(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset, - src_coef_arrays, dst_coef_arrays); - break; - } -} - -/* jtransform_perfect_transform - * - * Determine whether lossless transformation is perfectly - * possible for a specified image and transformation. - * - * Inputs: - * image_width, image_height: source image dimensions. - * MCU_width, MCU_height: pixel dimensions of MCU. - * transform: transformation identifier. - * Parameter sources from initialized jpeg_struct - * (after reading source header): - * image_width = cinfo.image_width - * image_height = cinfo.image_height - * MCU_width = cinfo.max_h_samp_factor * cinfo.block_size - * MCU_height = cinfo.max_v_samp_factor * cinfo.block_size - * Result: - * TRUE = perfect transformation possible - * FALSE = perfect transformation not possible - * (may use custom action then) - */ - -GLOBAL(boolean) -jtransform_perfect_transform(JDIMENSION image_width, JDIMENSION image_height, - int MCU_width, int MCU_height, - JXFORM_CODE transform) -{ - boolean result = TRUE; /* initialize TRUE */ - - switch (transform) { - case JXFORM_FLIP_H: - case JXFORM_ROT_270: - if (image_width % (JDIMENSION) MCU_width) - result = FALSE; - break; - case JXFORM_FLIP_V: - case JXFORM_ROT_90: - if (image_height % (JDIMENSION) MCU_height) - result = FALSE; - break; - case JXFORM_TRANSVERSE: - case JXFORM_ROT_180: - if (image_width % (JDIMENSION) MCU_width) - result = FALSE; - if (image_height % (JDIMENSION) MCU_height) - result = FALSE; - break; - default: - break; - } - - return result; -} - -#endif /* TRANSFORMS_SUPPORTED */ - - -/* Setup decompression object to save desired markers in memory. - * This must be called before jpeg_read_header() to have the desired effect. - */ - -GLOBAL(void) -jcopy_markers_setup (j_decompress_ptr srcinfo, JCOPY_OPTION option) -{ -#ifdef SAVE_MARKERS_SUPPORTED - int m; - - /* Save comments except under NONE option */ - if (option != JCOPYOPT_NONE) { - jpeg_save_markers(srcinfo, JPEG_COM, 0xFFFF); - } - /* Save all types of APPn markers iff ALL option */ - if (option == JCOPYOPT_ALL) { - for (m = 0; m < 16; m++) - jpeg_save_markers(srcinfo, JPEG_APP0 + m, 0xFFFF); - } -#endif /* SAVE_MARKERS_SUPPORTED */ -} - -/* Copy markers saved in the given source object to the destination object. - * This should be called just after jpeg_start_compress() or - * jpeg_write_coefficients(). - * Note that those routines will have written the SOI, and also the - * JFIF APP0 or Adobe APP14 markers if selected. - */ - -GLOBAL(void) -jcopy_markers_execute (j_decompress_ptr srcinfo, j_compress_ptr dstinfo, - JCOPY_OPTION option) -{ - jpeg_saved_marker_ptr marker; - - /* In the current implementation, we don't actually need to examine the - * option flag here; we just copy everything that got saved. - * But to avoid confusion, we do not output JFIF and Adobe APP14 markers - * if the encoder library already wrote one. - */ - for (marker = srcinfo->marker_list; marker != NULL; marker = marker->next) { - if (dstinfo->write_JFIF_header && - marker->marker == JPEG_APP0 && - marker->data_length >= 5 && - GETJOCTET(marker->data[0]) == 0x4A && - GETJOCTET(marker->data[1]) == 0x46 && - GETJOCTET(marker->data[2]) == 0x49 && - GETJOCTET(marker->data[3]) == 0x46 && - GETJOCTET(marker->data[4]) == 0) - continue; /* reject duplicate JFIF */ - if (dstinfo->write_Adobe_marker && - marker->marker == JPEG_APP0+14 && - marker->data_length >= 5 && - GETJOCTET(marker->data[0]) == 0x41 && - GETJOCTET(marker->data[1]) == 0x64 && - GETJOCTET(marker->data[2]) == 0x6F && - GETJOCTET(marker->data[3]) == 0x62 && - GETJOCTET(marker->data[4]) == 0x65) - continue; /* reject duplicate Adobe */ -#ifdef NEED_FAR_POINTERS - /* We could use jpeg_write_marker if the data weren't FAR... */ - { - unsigned int i; - jpeg_write_m_header(dstinfo, marker->marker, marker->data_length); - for (i = 0; i < marker->data_length; i++) - jpeg_write_m_byte(dstinfo, marker->data[i]); - } -#else - jpeg_write_marker(dstinfo, marker->marker, - marker->data, marker->data_length); -#endif - } -} |