+++ /dev/null
-/*
- * transupp.c
- *
- * Copyright (C) 1997, Thomas G. Lane.
- * 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 */
-
-
-#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.
- *
- * 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.
- *
- * 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. 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.
- * Notes 2,3,4 boil down to this: generally we should use the destination's
- * dimensions and ignore the source's.
- */
-
-
-LOCAL(void)
-do_flip_h (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
- jvirt_barray_ptr *src_coef_arrays)
-/* Horizontal flip; done in-place, so no separate dest array is required */
-{
- JDIMENSION MCU_cols, comp_width, blk_x, blk_y;
- 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 = dstinfo->image_width / (dstinfo->max_h_samp_factor * DCTSIZE);
-
- for (ci = 0; ci < dstinfo->num_components; ci++) {
- compptr = dstinfo->comp_info + ci;
- comp_width = MCU_cols * 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++) {
- 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;
- }
- }
- }
- }
- }
-}
-
-
-LOCAL(void)
-do_flip_v (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
- 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;
- 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 = dstinfo->image_height / (dstinfo->max_v_samp_factor * DCTSIZE);
-
- for (ci = 0; ci < dstinfo->num_components; ci++) {
- compptr = dstinfo->comp_info + ci;
- comp_height = MCU_rows * 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 (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 - 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,
- (JDIMENSION) compptr->v_samp_factor, FALSE);
- }
- for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
- if (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];
- 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], dst_buffer[offset_y],
- compptr->width_in_blocks);
- }
- }
- }
- }
-}
-
-
-LOCAL(void)
-do_transpose (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
- jvirt_barray_ptr *src_coef_arrays,
- jvirt_barray_ptr *dst_coef_arrays)
-/* Transpose source into destination */
-{
- JDIMENSION dst_blk_x, dst_blk_y;
- 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;
- 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,
- (JDIMENSION) compptr->h_samp_factor, FALSE);
- for (offset_x = 0; offset_x < compptr->h_samp_factor; offset_x++) {
- src_ptr = src_buffer[offset_x][dst_blk_y + offset_y];
- dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x];
- 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,
- 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;
- 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 = dstinfo->image_width / (dstinfo->max_h_samp_factor * DCTSIZE);
-
- for (ci = 0; ci < dstinfo->num_components; ci++) {
- compptr = dstinfo->comp_info + ci;
- comp_width = MCU_cols * compptr->h_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,
- (JDIMENSION) compptr->h_samp_factor, FALSE);
- for (offset_x = 0; offset_x < compptr->h_samp_factor; offset_x++) {
- src_ptr = src_buffer[offset_x][dst_blk_y + offset_y];
- if (dst_blk_x < comp_width) {
- /* Block is within the mirrorable area. */
- dst_ptr = dst_buffer[offset_y]
- [comp_width - dst_blk_x - offset_x - 1];
- 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. */
- dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x];
- 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,
- 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;
- 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 = dstinfo->image_height / (dstinfo->max_v_samp_factor * DCTSIZE);
-
- for (ci = 0; ci < dstinfo->num_components; ci++) {
- compptr = dstinfo->comp_info + ci;
- comp_height = MCU_rows * 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,
- (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 (dst_blk_y < comp_height) {
- /* Block is within the mirrorable area. */
- src_ptr = src_buffer[offset_x]
- [comp_height - 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];
- 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,
- 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;
- 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 = dstinfo->image_width / (dstinfo->max_h_samp_factor * DCTSIZE);
- MCU_rows = dstinfo->image_height / (dstinfo->max_v_samp_factor * DCTSIZE);
-
- 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;
- 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 (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 - 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,
- (JDIMENSION) compptr->v_samp_factor, FALSE);
- }
- for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
- if (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];
- /* Process the blocks that can be mirrored both ways. */
- for (dst_blk_x = 0; dst_blk_x < comp_width; dst_blk_x++) {
- dst_ptr = dst_row_ptr[dst_blk_x];
- src_ptr = src_row_ptr[comp_width - 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++;
- }
- }
- }
- /* Any remaining right-edge blocks are only mirrored vertically. */
- for (; 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) {
- 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. */
- dst_row_ptr = dst_buffer[offset_y];
- src_row_ptr = src_buffer[offset_y];
- /* Process the blocks that can be mirrored. */
- for (dst_blk_x = 0; dst_blk_x < comp_width; dst_blk_x++) {
- dst_ptr = dst_row_ptr[dst_blk_x];
- src_ptr = src_row_ptr[comp_width - dst_blk_x - 1];
- for (i = 0; i < DCTSIZE2; i += 2) {
- *dst_ptr++ = *src_ptr++;
- *dst_ptr++ = - *src_ptr++;
- }
- }
- /* Any remaining right-edge blocks are only copied. */
- for (; 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 < DCTSIZE2; i++)
- *dst_ptr++ = *src_ptr++;
- }
- }
- }
- }
- }
-}
-
-
-LOCAL(void)
-do_transverse (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
- 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;
- int ci, i, j, offset_x, offset_y;
- JBLOCKARRAY src_buffer, dst_buffer;
- JCOEFPTR src_ptr, dst_ptr;
- jpeg_component_info *compptr;
-
- MCU_cols = dstinfo->image_width / (dstinfo->max_h_samp_factor * DCTSIZE);
- MCU_rows = dstinfo->image_height / (dstinfo->max_v_samp_factor * DCTSIZE);
-
- 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;
- 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,
- (JDIMENSION) compptr->h_samp_factor, FALSE);
- for (offset_x = 0; offset_x < compptr->h_samp_factor; offset_x++) {
- if (dst_blk_y < comp_height) {
- src_ptr = src_buffer[offset_x]
- [comp_height - dst_blk_y - offset_y - 1];
- if (dst_blk_x < comp_width) {
- /* Block is within the mirrorable area. */
- dst_ptr = dst_buffer[offset_y]
- [comp_width - dst_blk_x - offset_x - 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 */
- dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x];
- 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 {
- src_ptr = src_buffer[offset_x][dst_blk_y + offset_y];
- if (dst_blk_x < comp_width) {
- /* Bottom-edge blocks are mirrored in x only */
- dst_ptr = dst_buffer[offset_y]
- [comp_width - dst_blk_x - offset_x - 1];
- 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 */
- dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x];
- for (i = 0; i < DCTSIZE; i++)
- for (j = 0; j < DCTSIZE; j++)
- dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
- }
- }
- }
- }
- }
- }
- }
-}
-
-
-/* Request any required workspace.
- *
- * 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).
- */
-
-GLOBAL(void)
-jtransform_request_workspace (j_decompress_ptr srcinfo,
- jpeg_transform_info *info)
-{
- jvirt_barray_ptr *coef_arrays = NULL;
- jpeg_component_info *compptr;
- int ci;
-
- 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;
- }
-
- switch (info->transform) {
- case JXFORM_NONE:
- case JXFORM_FLIP_H:
- /* Don't need a workspace array */
- break;
- case JXFORM_FLIP_V:
- case JXFORM_ROT_180:
- /* Need workspace arrays having same dimensions as source image.
- * Note that we allocate arrays padded out to the next iMCU boundary,
- * so that transform routines need not worry about missing edge blocks.
- */
- coef_arrays = (jvirt_barray_ptr *)
- (*srcinfo->mem->alloc_small) ((j_common_ptr) srcinfo, JPOOL_IMAGE,
- SIZEOF(jvirt_barray_ptr) * info->num_components);
- for (ci = 0; ci < info->num_components; ci++) {
- compptr = srcinfo->comp_info + ci;
- coef_arrays[ci] = (*srcinfo->mem->request_virt_barray)
- ((j_common_ptr) srcinfo, JPOOL_IMAGE, FALSE,
- (JDIMENSION) jround_up((long) compptr->width_in_blocks,
- (long) compptr->h_samp_factor),
- (JDIMENSION) jround_up((long) compptr->height_in_blocks,
- (long) compptr->v_samp_factor),
- (JDIMENSION) compptr->v_samp_factor);
- }
- break;
- case JXFORM_TRANSPOSE:
- case JXFORM_TRANSVERSE:
- case JXFORM_ROT_90:
- case JXFORM_ROT_270:
- /* Need workspace arrays having transposed dimensions.
- * Note that we allocate arrays padded out to the next iMCU boundary,
- * so that transform routines need not worry about missing edge blocks.
- */
- coef_arrays = (jvirt_barray_ptr *)
- (*srcinfo->mem->alloc_small) ((j_common_ptr) srcinfo, JPOOL_IMAGE,
- SIZEOF(jvirt_barray_ptr) * info->num_components);
- for (ci = 0; ci < info->num_components; ci++) {
- compptr = srcinfo->comp_info + ci;
- coef_arrays[ci] = (*srcinfo->mem->request_virt_barray)
- ((j_common_ptr) srcinfo, JPOOL_IMAGE, FALSE,
- (JDIMENSION) jround_up((long) compptr->height_in_blocks,
- (long) compptr->v_samp_factor),
- (JDIMENSION) jround_up((long) compptr->width_in_blocks,
- (long) compptr->h_samp_factor),
- (JDIMENSION) compptr->h_samp_factor);
- }
- break;
- }
- info->workspace_coef_arrays = coef_arrays;
-}
-
-
-/* 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 dtemp;
- UINT16 qtemp;
-
- /* Transpose basic image dimensions */
- dtemp = dstinfo->image_width;
- dstinfo->image_width = dstinfo->image_height;
- dstinfo->image_height = dtemp;
-
- /* 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;
- }
- }
- }
- }
-}
-
-
-/* Trim off any partial iMCUs on the indicated destination edge */
-
-LOCAL(void)
-trim_right_edge (j_compress_ptr dstinfo)
-{
- int ci, max_h_samp_factor;
- JDIMENSION MCU_cols;
-
- /* We have to compute max_h_samp_factor ourselves,
- * because it hasn't been set yet in the destination
- * (and we don't want to use the source's value).
- */
- max_h_samp_factor = 1;
- for (ci = 0; ci < dstinfo->num_components; ci++) {
- int h_samp_factor = dstinfo->comp_info[ci].h_samp_factor;
- max_h_samp_factor = MAX(max_h_samp_factor, h_samp_factor);
- }
- MCU_cols = dstinfo->image_width / (max_h_samp_factor * DCTSIZE);
- if (MCU_cols > 0) /* can't trim to 0 pixels */
- dstinfo->image_width = MCU_cols * (max_h_samp_factor * DCTSIZE);
-}
-
-LOCAL(void)
-trim_bottom_edge (j_compress_ptr dstinfo)
-{
- int ci, max_v_samp_factor;
- JDIMENSION MCU_rows;
-
- /* We have to compute max_v_samp_factor ourselves,
- * because it hasn't been set yet in the destination
- * (and we don't want to use the source's value).
- */
- max_v_samp_factor = 1;
- for (ci = 0; ci < dstinfo->num_components; ci++) {
- int v_samp_factor = dstinfo->comp_info[ci].v_samp_factor;
- max_v_samp_factor = MAX(max_v_samp_factor, v_samp_factor);
- }
- MCU_rows = dstinfo->image_height / (max_v_samp_factor * DCTSIZE);
- if (MCU_rows > 0) /* can't trim to 0 pixels */
- dstinfo->image_height = MCU_rows * (max_v_samp_factor * DCTSIZE);
-}
-
-
-/* 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) {
- /* We use jpeg_set_colorspace to make sure subsidiary settings get fixed
- * properly. Among other things, the target h_samp_factor & v_samp_factor
- * will get set to 1, which typically won't match the source.
- * In fact we do this even if the source is already grayscale; that
- * provides an easy way of coercing a grayscale JPEG with funny sampling
- * factors to the customary 1,1. (Some decoders fail on other factors.)
- */
- if ((dstinfo->jpeg_color_space == JCS_YCbCr &&
- dstinfo->num_components == 3) ||
- (dstinfo->jpeg_color_space == JCS_GRAYSCALE &&
- dstinfo->num_components == 1)) {
- /* We have to preserve the source's quantization table number. */
- 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);
- }
- }
-
- /* Correct the destination's image dimensions etc if necessary */
- switch (info->transform) {
- case JXFORM_NONE:
- /* Nothing to do */
- break;
- case JXFORM_FLIP_H:
- if (info->trim)
- trim_right_edge(dstinfo);
- break;
- case JXFORM_FLIP_V:
- if (info->trim)
- trim_bottom_edge(dstinfo);
- break;
- case JXFORM_TRANSPOSE:
- transpose_critical_parameters(dstinfo);
- /* transpose does NOT have to trim anything */
- break;
- case JXFORM_TRANSVERSE:
- transpose_critical_parameters(dstinfo);
- if (info->trim) {
- trim_right_edge(dstinfo);
- trim_bottom_edge(dstinfo);
- }
- break;
- case JXFORM_ROT_90:
- transpose_critical_parameters(dstinfo);
- if (info->trim)
- trim_right_edge(dstinfo);
- break;
- case JXFORM_ROT_180:
- if (info->trim) {
- trim_right_edge(dstinfo);
- trim_bottom_edge(dstinfo);
- }
- break;
- case JXFORM_ROT_270:
- transpose_critical_parameters(dstinfo);
- if (info->trim)
- trim_bottom_edge(dstinfo);
- break;
- }
-
- /* 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_transformation (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;
-
- switch (info->transform) {
- case JXFORM_NONE:
- break;
- case JXFORM_FLIP_H:
- do_flip_h(srcinfo, dstinfo, src_coef_arrays);
- break;
- case JXFORM_FLIP_V:
- do_flip_v(srcinfo, dstinfo, src_coef_arrays, dst_coef_arrays);
- break;
- case JXFORM_TRANSPOSE:
- do_transpose(srcinfo, dstinfo, src_coef_arrays, dst_coef_arrays);
- break;
- case JXFORM_TRANSVERSE:
- do_transverse(srcinfo, dstinfo, src_coef_arrays, dst_coef_arrays);
- break;
- case JXFORM_ROT_90:
- do_rot_90(srcinfo, dstinfo, src_coef_arrays, dst_coef_arrays);
- break;
- case JXFORM_ROT_180:
- do_rot_180(srcinfo, dstinfo, src_coef_arrays, dst_coef_arrays);
- break;
- case JXFORM_ROT_270:
- do_rot_270(srcinfo, dstinfo, src_coef_arrays, dst_coef_arrays);
- break;
- }
-}
-
-#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
- }
-}
projects / synfig.git / blobdiff