diff options
Diffstat (limited to 'src/transupp.c')
| -rw-r--r-- | src/transupp.c | 1069 |
1 files changed, 463 insertions, 606 deletions
diff --git a/src/transupp.c b/src/transupp.c index 7a114be..162cc3f 100644 --- a/src/transupp.c +++ b/src/transupp.c @@ -1,7 +1,7 @@ /* * transupp.c * - * Copyright (C) 1997-2009, Thomas G. Lane, Guido Vollbeding. + * 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. * @@ -27,13 +27,12 @@ #define MEMCOPY(dest,src,size) memcpy((void *)(dest), (const void *)(src), (size_t)(size)) #define SIZEOF(object) ((size_t) sizeof(object)) #define JFREAD(file,buf,sizeofbuf) \ - ((size_t) fread((void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file))) + ((size_t) fread((void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file))) #define JFWRITE(file,buf,sizeofbuf) \ - ((size_t) fwrite((const void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file))) + ((size_t) fwrite((const void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file))) + #include "jpeglib.h" #include "transupp.h" /* My own external interface */ -#include <ctype.h> /* to declare isdigit() */ - #if TRANSFORMS_SUPPORTED @@ -41,8 +40,7 @@ * 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. + * 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 @@ -56,13 +54,6 @@ * 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 @@ -75,25 +66,17 @@ * 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 + * 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_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. - */ +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, x_crop_blocks; + JDIMENSION MCU_cols, comp_width, blk_x, blk_y; int ci, k, offset_y; JBLOCKARRAY buffer; JCOEFPTR ptr1, ptr2; @@ -105,18 +88,16 @@ do_flip_h_no_crop(j_decompress_ptr srcinfo, j_compress_ptr dstinfo, * 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); + 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; - 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); + ((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]; @@ -132,31 +113,17 @@ do_flip_h_no_crop(j_decompress_ptr srcinfo, j_compress_ptr dstinfo, *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_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; @@ -170,35 +137,33 @@ do_flip_v(j_decompress_ptr srcinfo, j_compress_ptr dstinfo, * 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); + 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; - 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) { + ((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 - y_crop_blocks - dst_blk_y - + ((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 + y_crop_blocks, (JDIMENSION) compptr->v_samp_factor, FALSE); + ((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 (y_crop_blocks + dst_blk_y < comp_height) { + 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]; - 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]; @@ -213,22 +178,20 @@ do_flip_v(j_decompress_ptr srcinfo, j_compress_ptr dstinfo, } } else { /* Just copy row verbatim. */ - jcopy_block_row(src_buffer[offset_y] + x_crop_blocks, - dst_buffer[offset_y], compptr->width_in_blocks); + 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, - 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; + 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; @@ -241,24 +204,25 @@ do_transpose(j_decompress_ptr srcinfo, j_compress_ptr dstinfo, */ 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); + ((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) { + 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); + ((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]; - src_ptr = src_buffer[offset_x][dst_blk_y + offset_y + y_crop_blocks]; + 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]; + dst_ptr[j * DCTSIZE + i] + = src_ptr[i * DCTSIZE + j]; } } } @@ -266,10 +230,8 @@ do_transpose(j_decompress_ptr srcinfo, j_compress_ptr dstinfo, } } - 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; @@ -278,7 +240,6 @@ do_rot_90(j_decompress_ptr srcinfo, j_compress_ptr dstinfo, */ { 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; @@ -288,57 +249,45 @@ do_rot_90(j_decompress_ptr srcinfo, j_compress_ptr dstinfo, * 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); + 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; - 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); + ((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 (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 (x_crop_blocks + dst_blk_x < comp_width) { + src_ptr = src_buffer[offset_x] + [dst_blk_y + offset_y]; + if (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]; + 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]; + 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]; + 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]; + 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]; + dst_ptr[j * DCTSIZE + i] + = src_ptr[i * DCTSIZE + j]; } } } @@ -347,10 +296,8 @@ do_rot_90(j_decompress_ptr srcinfo, j_compress_ptr dstinfo, } } - 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; @@ -359,7 +306,6 @@ do_rot_270(j_decompress_ptr srcinfo, j_compress_ptr dstinfo, */ { 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; @@ -369,46 +315,45 @@ do_rot_270(j_decompress_ptr srcinfo, j_compress_ptr dstinfo, * 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); + 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; - 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); + ((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) { + 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); + ((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 (y_crop_blocks + dst_blk_y < comp_height) { + 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 - y_crop_blocks - dst_blk_y - offset_y - 1]; + [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]; + dst_ptr[j * DCTSIZE + i] + = src_ptr[i * DCTSIZE + j]; j++; - dst_ptr[j * DCTSIZE + i] = - -src_ptr[i * 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]; + [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]; + dst_ptr[j * DCTSIZE + i] + = src_ptr[i * DCTSIZE + j]; } } } @@ -417,10 +362,8 @@ do_rot_270(j_decompress_ptr srcinfo, j_compress_ptr dstinfo, } } - 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; @@ -429,101 +372,97 @@ do_rot_180(j_decompress_ptr srcinfo, j_compress_ptr dstinfo, */ { 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); + 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; - 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) { + ((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 - y_crop_blocks - dst_blk_y - + ((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 + y_crop_blocks, (JDIMENSION) compptr->v_samp_factor, FALSE); + ((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++) { - dst_row_ptr = dst_buffer[offset_y]; - if (y_crop_blocks + dst_blk_y < comp_height) { + 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++) { + /* 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]; - 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++; - } + 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++; } - } 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++; + /* 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]; - 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); + /* 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, - 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; @@ -536,105 +475,91 @@ do_transverse(j_decompress_ptr srcinfo, j_compress_ptr dstinfo, */ { 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); + 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; - 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); + ((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 (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 (y_crop_blocks + dst_blk_y < comp_height) { - if (x_crop_blocks + dst_blk_x < comp_width) { + 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. */ - src_ptr = - src_buffer[compptr->h_samp_factor - offset_x - 1] - [comp_height - y_crop_blocks - dst_blk_y - - offset_y - 1]; + 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]; + dst_ptr[j * DCTSIZE + i] + = src_ptr[i * DCTSIZE + j]; j++; - dst_ptr[j * DCTSIZE + i] = - -src_ptr[i * 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]; + dst_ptr[j * DCTSIZE + i] + = -src_ptr[i * DCTSIZE + j]; j++; - dst_ptr[j * DCTSIZE + i] = - src_ptr[i * DCTSIZE + 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]; + 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]; + dst_ptr[j * DCTSIZE + i] + = src_ptr[i * DCTSIZE + j]; j++; - dst_ptr[j * DCTSIZE + i] = - -src_ptr[i * DCTSIZE + j]; + dst_ptr[j * DCTSIZE + i] + = -src_ptr[i * DCTSIZE + j]; } } } } else { - if (x_crop_blocks + dst_blk_x < comp_width) { + 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 */ - src_ptr = - src_buffer[compptr->h_samp_factor - offset_x - 1] - [dst_blk_y + offset_y + y_crop_blocks]; + 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]; + 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]; + 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]; + 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]; + dst_ptr[j * DCTSIZE + i] + = src_ptr[i * DCTSIZE + j]; } } } @@ -644,114 +569,8 @@ do_transverse(j_decompress_ptr srcinfo, j_compress_ptr dstinfo, } } - -/* 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>x<height>{+-}<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; - info->crop_width_set = JCROP_POS; - } - if (*spec == 'x' || *spec == 'X') { - /* fetch height */ - spec++; - if (!jt_read_integer(&spec, &info->crop_height)) - return FALSE; - 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. @@ -760,221 +579,87 @@ LOCAL(void) trim_bottom_edge(jpeg_transform_info * info, JDIMENSION full_height) * the source's virtual arrays). */ -GLOBAL(boolean) - jtransform_request_workspace(j_decompress_ptr srcinfo, jpeg_transform_info * info) +GLOBAL(void) jtransform_request_workspace(j_decompress_ptr srcinfo, jpeg_transform_info * info) { - jvirt_barray_ptr *coef_arrays; - boolean need_workspace, transpose_it; + jvirt_barray_ptr *coef_arrays = NULL; 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; + int ci; - /* Determine number of components in output image */ - if (info->force_grayscale && srcinfo->jpeg_color_space == JCS_YCbCr && srcinfo->num_components == 3) + 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 + } else { /* Process all the components */ info->num_components = srcinfo->num_components; - - /* Compute output image dimensions and related values. */ - jpeg_core_output_dimensions(srcinfo); - - /* 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 */ - info->output_width = info->crop_width + (xoffset % info->iMCU_sample_width); - 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 */ + /* Don'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; + 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: - /* 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) { + /* 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); - 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); + (*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; - 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); + ((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); } - info->workspace_coef_arrays = coef_arrays; - } else - info->workspace_coef_arrays = NULL; - - return TRUE; + break; + } + info->workspace_coef_arrays = coef_arrays; } - /* Transpose destination image parameters */ -LOCAL(void) - transpose_critical_parameters(j_compress_ptr dstinfo) +LOCAL(void) transpose_critical_parameters(j_compress_ptr dstinfo) { int tblno, i, j, ci, itemp; jpeg_component_info *compptr; JQUANT_TBL *qtblptr; - JDIMENSION jtemp; + JDIMENSION dtemp; UINT16 qtemp; - /* Transpose image dimensions */ - jtemp = dstinfo->image_width; + /* Transpose basic image dimensions */ + dtemp = 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; + dstinfo->image_height = dtemp; /* Transpose sampling factors */ for (ci = 0; ci < dstinfo->num_components; ci++) { @@ -999,6 +684,156 @@ LOCAL(void) } } +/* 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); +} + +LOCAL(void) set_exif_orientation(JOCTET FAR * data, unsigned int length, unsigned char new_orient) +{ + boolean is_motorola; /* Flag for byte order */ + unsigned int number_of_tags, tagnum; + unsigned int firstoffset, offset; + + 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 Orientation 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 == 0x0112) + break; /* found Orientation Tag */ + if (--number_of_tags == 0) + return; + firstoffset += 12; + } + + if (is_motorola) { + data[firstoffset + 2] = 0; /* Format = unsigned short (2 octets) */ + data[firstoffset + 3] = 3; + data[firstoffset + 4] = 0; /* Number Of Components = 1 */ + data[firstoffset + 5] = 0; + data[firstoffset + 6] = 0; + data[firstoffset + 7] = 1; + data[firstoffset + 8] = 0; + data[firstoffset + 9] = (unsigned char) new_orient; + data[firstoffset + 10] = 0; + data[firstoffset + 11] = 0; + } else { + data[firstoffset + 2] = 3; /* Format = unsigned short (2 octets) */ + data[firstoffset + 3] = 0; + data[firstoffset + 4] = 1; /* Number Of Components = 1 */ + data[firstoffset + 5] = 0; + data[firstoffset + 6] = 0; + data[firstoffset + 7] = 0; + data[firstoffset + 8] = (unsigned char) new_orient; + data[firstoffset + 9] = 0; + data[firstoffset + 10] = 0; + data[firstoffset + 11] = 0; + } +} /* Adjust Exif image parameters. * @@ -1010,6 +845,7 @@ LOCAL(void) adjust_exif_parameters(JOCTET FAR * data, unsigned int length, JDIME boolean is_motorola; /* Flag for byte order */ unsigned int number_of_tags, tagnum; unsigned int firstoffset, offset; + unsigned int new_orient; JDIMENSION new_value; if (length < 12) @@ -1142,10 +978,11 @@ LOCAL(void) adjust_exif_parameters(JOCTET FAR * data, unsigned int length, JDIME tagnum += GETJOCTET(data[offset]); } if (tagnum == 0xA002 || tagnum == 0xA003) { - if (tagnum == 0xA002) + if (tagnum == 0xA002) { new_value = new_width; /* ExifImageWidth Tag */ - else + } else { new_value = new_height; /* ExifImageHeight Tag */ + } if (is_motorola) { data[offset + 2] = 0; /* Format = unsigned long (4 octets) */ data[offset + 3] = 4; @@ -1174,7 +1011,6 @@ LOCAL(void) adjust_exif_parameters(JOCTET FAR * data, unsigned int length, JDIME } while (--number_of_tags); } - /* Adjust output image parameters as needed. * * This must be called after jpeg_copy_critical_parameters() @@ -1190,24 +1026,20 @@ 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) { + jpeg_saved_marker_ptr marker; /* 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.) + /* 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)) && - 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. - */ + 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; @@ -1215,50 +1047,79 @@ GLOBAL(jvirt_barray_ptr *) /* 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 */ + /* 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: - case JXFORM_ROT_270: transpose_critical_parameters(dstinfo); + if (info->trim) + trim_right_edge(dstinfo); break; - default: + 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; } - /* 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); + for (marker = srcinfo->marker_list; marker != NULL; marker = marker->next) { + if (marker->marker != JPEG_APP0 + 1) + continue; + /* Adjust Exif properties */ + if (marker->marker == JPEG_APP0 + 1 && + marker->data_length >= 6 && + GETJOCTET(marker->data[0]) == 0x45 && + GETJOCTET(marker->data[1]) == 0x78 && + GETJOCTET(marker->data[2]) == 0x69 && + GETJOCTET(marker->data[3]) == 0x66 && + GETJOCTET(marker->data[4]) == 0 && GETJOCTET(marker->data[5]) == 0) { + /* Suppress output of JFIF marker */ + dstinfo->write_JFIF_header = FALSE; + /* Adjust Exif image parameters */ + if (dstinfo->image_width != srcinfo->image_width || + dstinfo->image_height != srcinfo->image_height) + /* Align data segment to start of TIFF structure for parsing */ + adjust_exif_parameters(marker->data + 6, + marker->data_length - 6, + dstinfo->image_width, dstinfo->image_height); + /* I'm honestly not sure what the right thing to do is here.. The + * existing orientation tag may be incorrect, so making a change based + * on the previous value seems like the wrong thing to do. For now, I'm + * going to assume that the user is always "fixing" the orientation, + * i.e. putting the image the "right way up". In this case, we want to + * set the orientation to "top left". + */ + set_exif_orientation(marker->data + 6, marker->data_length - 6, 1); + } } /* Return the appropriate output data set */ @@ -1267,7 +1128,6 @@ GLOBAL(jvirt_barray_ptr *) return src_coef_arrays; } - /* Execute the actual transformation, if any. * * This must be called *after* jpeg_write_coefficients, because it depends @@ -1278,51 +1138,48 @@ GLOBAL(jvirt_barray_ptr *) */ GLOBAL(void) - jtransform_execute_transform(j_decompress_ptr srcinfo, - j_compress_ptr dstinfo, jvirt_barray_ptr * src_coef_arrays, jpeg_transform_info * info) + + + 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; - /* Note: conditions tested here should match those in switch statement - * in jtransform_request_workspace() - */ switch (info->transform) { case JXFORM_NONE: break; case JXFORM_FLIP_H: - do_flip_h_no_crop(srcinfo, dstinfo, 0, src_coef_arrays); + do_flip_h(srcinfo, dstinfo, src_coef_arrays); break; case JXFORM_FLIP_V: - do_flip_v(srcinfo, dstinfo, 0, 0, src_coef_arrays, dst_coef_arrays); + do_flip_v(srcinfo, dstinfo, src_coef_arrays, dst_coef_arrays); break; case JXFORM_TRANSPOSE: - do_transpose(srcinfo, dstinfo, 0, 0, - src_coef_arrays, dst_coef_arrays); + do_transpose(srcinfo, dstinfo, src_coef_arrays, dst_coef_arrays); break; case JXFORM_TRANSVERSE: - do_transverse(srcinfo, dstinfo, 0, 0, src_coef_arrays, dst_coef_arrays); + do_transverse(srcinfo, dstinfo, src_coef_arrays, dst_coef_arrays); break; case JXFORM_ROT_90: - do_rot_90(srcinfo, dstinfo, 0, 0, src_coef_arrays, dst_coef_arrays); + do_rot_90(srcinfo, dstinfo, src_coef_arrays, dst_coef_arrays); break; case JXFORM_ROT_180: - do_rot_180(srcinfo, dstinfo, 0, 0, src_coef_arrays, dst_coef_arrays); + do_rot_180(srcinfo, dstinfo, src_coef_arrays, dst_coef_arrays); break; case JXFORM_ROT_270: - do_rot_270(srcinfo, dstinfo, 0, 0, src_coef_arrays, dst_coef_arrays); + 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) +GLOBAL(void) jcopy_markers_setup(j_decompress_ptr srcinfo, JCOPY_OPTION option) { #ifdef SAVE_MARKERS_SUPPORTED int m; @@ -1356,13 +1213,13 @@ GLOBAL(void) jcopy_markers_execute(j_decompress_ptr srcinfo, j_compress_ptr dsti * 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) + 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 && |