Revert "Fix lossless image rotation" (ac0d19cd) · Commits · derf / feh

TODO

+0 −3

Original line number	Diff line number	Diff line
		@@ -27,6 +27,3 @@ Control thumbnail mode (image selection, mainly) with keys.

		Xinerama support is present, but far from perfect.
		Some day I will debug that, I guess.

		We have a lot of copypasta from libjpeg (jpegint.h, transupp.[ch]).
		I wonder if they can be #included from somewhere.

src/jpegint.h

+42 −72

Original line number	Diff line number	Diff line
		@@ -2,7 +2,6 @@
		* jpegint.h
		*
		* Copyright (C) 1991-1997, Thomas G. Lane.
		* Modified 1997-2009 by Guido Vollbeding.
		* This file is part of the Independent JPEG Group's software.
		* For conditions of distribution and use, see the accompanying README file.
		*
		@@ -11,7 +10,6 @@
		* applications using the library shouldn't need to include this file.
		*/


		/* Declarations for both compression & decompression */

		typedef enum { /* Operating modes for buffer controllers */
		@@ -39,7 +37,6 @@ typedef enum { /* Operating modes for buffer controllers */
		#define DSTATE_RDCOEFS 209 /* reading file in jpeg_read_coefficients */
		#define DSTATE_STOPPING 210 /* looking for EOI in jpeg_finish_decompress */


		/* Declarations for compression modules */

		/* Master control module */
		@@ -56,19 +53,17 @@ struct jpeg_comp_master {
		/* Main buffer control (downsampled-data buffer) */
		struct jpeg_c_main_controller {
		JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));
		JMETHOD(void, process_data, (j_compress_ptr cinfo,
		JSAMPARRAY input_buf, JDIMENSION * in_row_ctr, JDIMENSION in_rows_avail));
		JMETHOD(void, process_data,
		(j_compress_ptr cinfo, JSAMPARRAY input_buf, JDIMENSION * in_row_ctr, JDIMENSION in_rows_avail));
		};

		/* Compression preprocessing (downsampling input buffer control) */
		struct jpeg_c_prep_controller {
		JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));
		JMETHOD(void, pre_process_data, (j_compress_ptr cinfo,
		JSAMPARRAY input_buf,
		JDIMENSION * in_row_ctr,
		JDIMENSION in_rows_avail,
		JSAMPIMAGE output_buf,
		JDIMENSION * out_row_group_ctr, JDIMENSION out_row_groups_avail));
		JMETHOD(void, pre_process_data,
		(j_compress_ptr cinfo, JSAMPARRAY input_buf,
		JDIMENSION * in_row_ctr, JDIMENSION in_rows_avail,
		JSAMPIMAGE output_buf, JDIMENSION * out_row_group_ctr, JDIMENSION out_row_groups_avail));
		};

		/* Coefficient buffer control */
		@@ -81,30 +76,29 @@ struct jpeg_c_coef_controller {
		struct jpeg_color_converter {
		JMETHOD(void, start_pass, (j_compress_ptr cinfo));
		JMETHOD(void, color_convert, (j_compress_ptr cinfo,
		JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
		JDIMENSION output_row, int num_rows));
		JSAMPARRAY input_buf,
		JSAMPIMAGE output_buf, JDIMENSION output_row, int num_rows));
		};

		/* Downsampling */
		struct jpeg_downsampler {
		JMETHOD(void, start_pass, (j_compress_ptr cinfo));
		JMETHOD(void, downsample, (j_compress_ptr cinfo,
		JSAMPIMAGE input_buf, JDIMENSION in_row_index,
		JSAMPIMAGE output_buf, JDIMENSION out_row_group_index));
		JSAMPIMAGE input_buf,
		JDIMENSION in_row_index, JSAMPIMAGE output_buf, JDIMENSION out_row_group_index));

		boolean need_context_rows; /* TRUE if need rows above & below */
		};

		/* Forward DCT (also controls coefficient quantization) */
		typedef JMETHOD(void, forward_DCT_ptr,
		(j_compress_ptr cinfo, jpeg_component_info * compptr,
		JSAMPARRAY sample_data, JBLOCKROW coef_blocks,
		JDIMENSION start_row, JDIMENSION start_col, JDIMENSION num_blocks));

		struct jpeg_forward_dct {
		JMETHOD(void, start_pass, (j_compress_ptr cinfo));
		/* It is useful to allow each component to have a separate FDCT method. */
		forward_DCT_ptr forward_DCT[MAX_COMPONENTS];
		/* perhaps this should be an array??? */
		JMETHOD(void, forward_DCT, (j_compress_ptr cinfo,
		jpeg_component_info * compptr,
		JSAMPARRAY sample_data,
		JBLOCKROW coef_blocks,
		JDIMENSION start_row, JDIMENSION start_col, JDIMENSION num_blocks));
		};

		/* Entropy encoding */
		@@ -127,7 +121,6 @@ struct jpeg_marker_writer {
		JMETHOD(void, write_marker_byte, (j_compress_ptr cinfo, int val));
		};


		/* Declarations for decompression modules */

		/* Master control module */
		@@ -154,8 +147,8 @@ struct jpeg_input_controller {
		/* Main buffer control (downsampled-data buffer) */
		struct jpeg_d_main_controller {
		JMETHOD(void, start_pass, (j_decompress_ptr cinfo, J_BUF_MODE pass_mode));
		JMETHOD(void, process_data, (j_decompress_ptr cinfo,
		JSAMPARRAY output_buf, JDIMENSION * out_row_ctr, JDIMENSION out_rows_avail));
		JMETHOD(void, process_data,
		(j_decompress_ptr cinfo, JSAMPARRAY output_buf, JDIMENSION * out_row_ctr, JDIMENSION out_rows_avail));
		};

		/* Coefficient buffer control */
		@@ -171,11 +164,11 @@ struct jpeg_d_coef_controller {
		/* Decompression postprocessing (color quantization buffer control) */
		struct jpeg_d_post_controller {
		JMETHOD(void, start_pass, (j_decompress_ptr cinfo, J_BUF_MODE pass_mode));
		JMETHOD(void, post_process_data, (j_decompress_ptr cinfo,
		JSAMPIMAGE input_buf,
		JMETHOD(void, post_process_data,
		(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
		JDIMENSION * in_row_group_ctr,
		JDIMENSION in_row_groups_avail,
		JSAMPARRAY output_buf, JDIMENSION * out_row_ctr, JDIMENSION out_rows_avail));
		JDIMENSION in_row_groups_avail, JSAMPARRAY output_buf,
		JDIMENSION * out_row_ctr, JDIMENSION out_rows_avail));
		};

		/* Marker reading & parsing */
		@@ -202,6 +195,10 @@ struct jpeg_marker_reader {
		struct jpeg_entropy_decoder {
		JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
		JMETHOD(boolean, decode_mcu, (j_decompress_ptr cinfo, JBLOCKROW * MCU_data));

		/* This is here to share code between baseline and progressive decoders; */
		/* other modules probably should not use it */
		boolean insufficient_data; /* set TRUE after emitting warning */
		};

		/* Inverse DCT (also performs dequantization) */
		@@ -231,20 +228,19 @@ struct jpeg_upsampler {
		struct jpeg_color_deconverter {
		JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
		JMETHOD(void, color_convert, (j_decompress_ptr cinfo,
		JSAMPIMAGE input_buf, JDIMENSION input_row,
		JSAMPARRAY output_buf, int num_rows));
		JSAMPIMAGE input_buf,
		JDIMENSION input_row, JSAMPARRAY output_buf, int num_rows));
		};

		/* Color quantization or color precision reduction */
		struct jpeg_color_quantizer {
		JMETHOD(void, start_pass, (j_decompress_ptr cinfo, boolean is_pre_scan));
		JMETHOD(void, color_quantize, (j_decompress_ptr cinfo,
		JSAMPARRAY input_buf, JSAMPARRAY output_buf, int num_rows));
		JMETHOD(void, color_quantize,
		(j_decompress_ptr cinfo, JSAMPARRAY input_buf, JSAMPARRAY output_buf, int num_rows));
		JMETHOD(void, finish_pass, (j_decompress_ptr cinfo));
		JMETHOD(void, new_color_map, (j_decompress_ptr cinfo));
		};


		/* Miscellaneous useful macros */

		#undef MAX
		@@ -252,7 +248,6 @@ struct jpeg_color_quantizer {
		#undef MIN
		#define MIN(a,b) ((a) < (b) ? (a) : (b))


		/* We assume that right shift corresponds to signed division by 2 with
		* rounding towards minus infinity. This is correct for typical "arithmetic
		* shift" instructions that shift in copies of the sign bit. But some
		@@ -274,7 +269,6 @@ struct jpeg_color_quantizer {
		#define RIGHT_SHIFT(x,shft) ((x) >> (shft))
		#endif


		/* Short forms of external names for systems with brain-damaged linkers. */

		#ifdef NEED_SHORT_EXTERNAL_NAMES
		@@ -287,7 +281,7 @@ struct jpeg_color_quantizer {
		#define jinit_downsampler jIDownsampler
		#define jinit_forward_dct jIFDCT
		#define jinit_huff_encoder jIHEncoder
		#define jinit_arith_encoder jIAEncoder
		#define jinit_phuff_encoder jIPHEncoder
		#define jinit_marker_writer jIMWriter
		#define jinit_master_decompress jIDMaster
		#define jinit_d_main_controller jIDMainC
		@@ -296,7 +290,7 @@ struct jpeg_color_quantizer {
		#define jinit_input_controller jIInCtlr
		#define jinit_marker_reader jIMReader
		#define jinit_huff_decoder jIHDecoder
		#define jinit_arith_decoder jIADecoder
		#define jinit_phuff_decoder jIPHDecoder
		#define jinit_inverse_dct jIIDCT
		#define jinit_upsampler jIUpsampler
		#define jinit_color_deconverter jIDColor
		@@ -311,27 +305,16 @@ struct jpeg_color_quantizer {
		#define jzero_far jZeroFar
		#define jpeg_zigzag_order jZIGTable
		#define jpeg_natural_order jZAGTable
		#define jpeg_natural_order7 jZAGTable7
		#define jpeg_natural_order6 jZAGTable6
		#define jpeg_natural_order5 jZAGTable5
		#define jpeg_natural_order4 jZAGTable4
		#define jpeg_natural_order3 jZAGTable3
		#define jpeg_natural_order2 jZAGTable2
		#define jpeg_aritab jAriTab
		#endif /* NEED_SHORT_EXTERNAL_NAMES */


		/* Compression module initialization routines */
		EXTERN(void)
		jinit_compress_master JPP((j_compress_ptr cinfo));
		EXTERN(void)
		jinit_c_master_control JPP((j_compress_ptr cinfo, boolean transcode_only));
		EXTERN(void)
		jinit_c_main_controller JPP((j_compress_ptr cinfo, boolean need_full_buffer));
		EXTERN(void)
		jinit_c_prep_controller JPP((j_compress_ptr cinfo, boolean need_full_buffer));
		EXTERN(void)
		jinit_c_coef_controller JPP((j_compress_ptr cinfo, boolean need_full_buffer));
		EXTERN(void) jinit_c_main_controller JPP((j_compress_ptr cinfo, boolean need_full_buffer));
		EXTERN(void) jinit_c_prep_controller JPP((j_compress_ptr cinfo, boolean need_full_buffer));
		EXTERN(void) jinit_c_coef_controller JPP((j_compress_ptr cinfo, boolean need_full_buffer));
		EXTERN(void)
		jinit_color_converter JPP((j_compress_ptr cinfo));
		EXTERN(void)
		@@ -341,18 +324,15 @@ jinit_forward_dct JPP((j_compress_ptr cinfo));
		EXTERN(void)
		jinit_huff_encoder JPP((j_compress_ptr cinfo));
		EXTERN(void)
		jinit_arith_encoder JPP((j_compress_ptr cinfo));
		jinit_phuff_encoder JPP((j_compress_ptr cinfo));
		EXTERN(void)
		jinit_marker_writer JPP((j_compress_ptr cinfo));
		/* Decompression module initialization routines */
		EXTERN(void)
		jinit_master_decompress JPP((j_decompress_ptr cinfo));
		EXTERN(void)
		jinit_d_main_controller JPP((j_decompress_ptr cinfo, boolean need_full_buffer));
		EXTERN(void)
		jinit_d_coef_controller JPP((j_decompress_ptr cinfo, boolean need_full_buffer));
		EXTERN(void)
		jinit_d_post_controller JPP((j_decompress_ptr cinfo, boolean need_full_buffer));
		EXTERN(void) jinit_d_main_controller JPP((j_decompress_ptr cinfo, boolean need_full_buffer));
		EXTERN(void) jinit_d_coef_controller JPP((j_decompress_ptr cinfo, boolean need_full_buffer));
		EXTERN(void) jinit_d_post_controller JPP((j_decompress_ptr cinfo, boolean need_full_buffer));
		EXTERN(void)
		jinit_input_controller JPP((j_decompress_ptr cinfo));
		EXTERN(void)
		@@ -360,7 +340,7 @@ jinit_marker_reader JPP((j_decompress_ptr cinfo));
		EXTERN(void)
		jinit_huff_decoder JPP((j_decompress_ptr cinfo));
		EXTERN(void)
		jinit_arith_decoder JPP((j_decompress_ptr cinfo));
		jinit_phuff_decoder JPP((j_decompress_ptr cinfo));
		EXTERN(void)
		jinit_inverse_dct JPP((j_decompress_ptr cinfo));
		EXTERN(void)
		@@ -385,8 +365,7 @@ jround_up JPP((long a, long b));
		EXTERN(void)
		jcopy_sample_rows JPP((JSAMPARRAY input_array, int source_row,
		JSAMPARRAY output_array, int dest_row, int num_rows, JDIMENSION num_cols));
		EXTERN(void)
		jcopy_block_row JPP((JBLOCKROW input_row, JBLOCKROW output_row, JDIMENSION num_blocks));
		EXTERN(void) jcopy_block_row JPP((JBLOCKROW input_row, JBLOCKROW output_row, JDIMENSION num_blocks));
		EXTERN(void)
		jzero_far JPP((void FAR * target, size_t bytestozero));
		/* Constant tables in jutils.c */
		@@ -394,15 +373,6 @@ jzero_far JPP((void FAR * target, size_t bytestozero));
		extern const int jpeg_zigzag_order[]; /* natural coef order to zigzag order */
		#endif
		extern const int jpeg_natural_order[]; /* zigzag coef order to natural order */
		extern const int jpeg_natural_order7[]; /* zz to natural order for 7x7 block */
		extern const int jpeg_natural_order6[]; /* zz to natural order for 6x6 block */
		extern const int jpeg_natural_order5[]; /* zz to natural order for 5x5 block */
		extern const int jpeg_natural_order4[]; /* zz to natural order for 4x4 block */
		extern const int jpeg_natural_order3[]; /* zz to natural order for 3x3 block */
		extern const int jpeg_natural_order2[]; /* zz to natural order for 2x2 block */

		/* Arithmetic coding probability estimation tables in jaricom.c */
		extern const INT32 jpeg_aritab[];

		/* Suppress undefined-structure complaints if necessary. */

src/transupp.c

+463 −606

File changed.

Preview size limit exceeded, changes collapsed.

src/transupp.h

+30 −99

Original line number	Diff line number	Diff line
		/*
		* transupp.h
		*
		* 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.
		*
		@@ -22,6 +22,31 @@
		#define TRANSFORMS_SUPPORTED 1 /* 0 disables transform code */
		#endif

		/* Short forms of external names for systems with brain-damaged linkers. */

		#ifdef NEED_SHORT_EXTERNAL_NAMES
		#define jtransform_request_workspace jTrRequest
		#define jtransform_adjust_parameters jTrAdjust
		#define jtransform_execute_transformation jTrExec
		#define jcopy_markers_setup jCMrkSetup
		#define jcopy_markers_execute jCMrkExec
		#endif /* NEED_SHORT_EXTERNAL_NAMES */

		/*
		* Codes for supported types of image transformations.
		*/

		typedef enum {
		JXFORM_NONE, /* no transformation */
		JXFORM_FLIP_H, /* horizontal flip */
		JXFORM_FLIP_V, /* vertical flip */
		JXFORM_TRANSPOSE, /* transpose across UL-to-LR axis */
		JXFORM_TRANSVERSE, /* transpose across UR-to-LL axis */
		JXFORM_ROT_90, /* 90-degree clockwise rotation */
		JXFORM_ROT_180, /* 180-degree rotation */
		JXFORM_ROT_270 /* 270-degree clockwise (or 90 ccw) */
		} JXFORM_CODE;

		/*
		* Although rotating and flipping data expressed as DCT coefficients is not
		* hard, there is an asymmetry in the JPEG format specification for images
		@@ -49,24 +74,6 @@
		* (For example, -rot 270 -trim trims only the bottom edge, but -rot 90 -trim
		* followed by -rot 180 -trim trims both edges.)
		*
		* We also offer a lossless-crop option, which discards data outside a given
		* image region but losslessly preserves what is inside. Like the rotate and
		* flip transforms, lossless crop is restricted by the JPEG format: the upper
		* left corner of the selected region must fall on an iMCU boundary. If this
		* does not hold for the given crop parameters, we silently move the upper left
		* corner up and/or left to make it so, simultaneously increasing the region
		* dimensions to keep the lower right crop corner unchanged. (Thus, the
		* output image covers at least the requested region, but may cover more.)
		*
		* We also provide a lossless-resize option, which is kind of a lossless-crop
		* operation in the DCT coefficient block domain - it discards higher-order
		* coefficients and losslessly preserves lower-order coefficients of a
		* sub-block.
		*
		* Rotate/flip transform, resize, and crop can be requested together in a
		* single invocation. The crop is applied last --- that is, the crop region
		* is specified in terms of the destination image after transform/resize.
		*
		* We also offer a "force to grayscale" option, which simply discards the
		* chrominance channels of a YCbCr image. This is lossless in the sense that
		* the luminance channel is preserved exactly. It's not the same kind of
		@@ -75,107 +82,30 @@
		* be aware of the option to know how many components to work on.
		*/


		/* Short forms of external names for systems with brain-damaged linkers. */

		#ifdef NEED_SHORT_EXTERNAL_NAMES
		#define jtransform_parse_crop_spec jTrParCrop
		#define jtransform_request_workspace jTrRequest
		#define jtransform_adjust_parameters jTrAdjust
		#define jtransform_execute_transform jTrExec
		#define jtransform_perfect_transform jTrPerfect
		#define jcopy_markers_setup jCMrkSetup
		#define jcopy_markers_execute jCMrkExec
		#endif /* NEED_SHORT_EXTERNAL_NAMES */


		/*
		* Codes for supported types of image transformations.
		*/

		typedef enum {
		JXFORM_NONE, /* no transformation */
		JXFORM_FLIP_H, /* horizontal flip */
		JXFORM_FLIP_V, /* vertical flip */
		JXFORM_TRANSPOSE, /* transpose across UL-to-LR axis */
		JXFORM_TRANSVERSE, /* transpose across UR-to-LL axis */
		JXFORM_ROT_90, /* 90-degree clockwise rotation */
		JXFORM_ROT_180, /* 180-degree rotation */
		JXFORM_ROT_270 /* 270-degree clockwise (or 90 ccw) */
		} JXFORM_CODE;

		/*
		* Codes for crop parameters, which can individually be unspecified,
		* positive, or negative. (Negative width or height makes no sense, though.)
		*/

		typedef enum {
		JCROP_UNSET,
		JCROP_POS,
		JCROP_NEG
		} JCROP_CODE;

		/*
		* Transform parameters struct.
		* NB: application must not change any elements of this struct after
		* calling jtransform_request_workspace.
		*/

		typedef struct {
		/* Options: set by caller */
		JXFORM_CODE transform; /* image transform operator */
		boolean perfect; /* if TRUE, fail if partial MCUs are requested */
		boolean trim; /* if TRUE, trim partial MCUs as needed */
		boolean force_grayscale; /* if TRUE, convert color image to grayscale */
		boolean crop; /* if TRUE, crop source image */

		/* Crop parameters: application need not set these unless crop is TRUE.
		* These can be filled in by jtransform_parse_crop_spec().
		*/
		JDIMENSION crop_width; /* Width of selected region */
		JCROP_CODE crop_width_set;
		JDIMENSION crop_height; /* Height of selected region */
		JCROP_CODE crop_height_set;
		JDIMENSION crop_xoffset; /* X offset of selected region */
		JCROP_CODE crop_xoffset_set; /* (negative measures from right edge) */
		JDIMENSION crop_yoffset; /* Y offset of selected region */
		JCROP_CODE crop_yoffset_set; /* (negative measures from bottom edge) */

		/* Internal workspace: caller should not touch these */
		int num_components; /* # of components in workspace */
		jvirt_barray_ptr workspace_coef_arrays; / workspace for transformations */
		JDIMENSION output_width; /* cropped destination dimensions */
		JDIMENSION output_height;
		JDIMENSION x_crop_offset; /* destination crop offsets measured in iMCUs */
		JDIMENSION y_crop_offset;
		int iMCU_sample_width; /* destination iMCU size */
		int iMCU_sample_height;
		} jpeg_transform_info;


		#if TRANSFORMS_SUPPORTED

		/* Parse a crop specification (written in X11 geometry style) */
		EXTERN(boolean) jtransform_parse_crop_spec JPP((jpeg_transform_info * info, const char *spec));
		/* Request any required workspace */
		EXTERN(boolean) jtransform_request_workspace JPP((j_decompress_ptr srcinfo, jpeg_transform_info * info));
		EXTERN(void) jtransform_request_workspace JPP((j_decompress_ptr srcinfo, jpeg_transform_info * info));
		/* Adjust output image parameters */
		EXTERN(jvirt_barray_ptr *) jtransform_adjust_parameters
		JPP((j_decompress_ptr srcinfo, j_compress_ptr dstinfo, jvirt_barray_ptr * src_coef_arrays, jpeg_transform_info * info));
		/* Execute the actual transformation, if any */
		EXTERN(void) jtransform_execute_transform
		EXTERN(void) jtransform_execute_transformation
		JPP((j_decompress_ptr srcinfo, j_compress_ptr dstinfo, jvirt_barray_ptr * src_coef_arrays, jpeg_transform_info * info));

		/* jtransform_execute_transform used to be called
		* jtransform_execute_transformation, but some compilers complain about
		* routine names that long. This macro is here to avoid breaking any
		* old source code that uses the original name...
		*/
		#define jtransform_execute_transformation jtransform_execute_transform

		#endif /* TRANSFORMS_SUPPORTED */


		/*
		* Support for copying optional markers from source to destination file.
		*/
		@@ -189,6 +119,7 @@ typedef enum {
		#define JCOPYOPT_DEFAULT JCOPYOPT_COMMENTS /* recommended default */

		/* Setup decompression object to save desired markers in memory */
		EXTERN(void) jcopy_markers_setup JPP((j_decompress_ptr srcinfo, JCOPY_OPTION option));
		EXTERN(void)
		jcopy_markers_setup JPP((j_decompress_ptr srcinfo, JCOPY_OPTION option));
		/* Copy markers saved in the given source object to the destination object */
		EXTERN(void) jcopy_markers_execute JPP((j_decompress_ptr srcinfo, j_compress_ptr dstinfo, JCOPY_OPTION option));

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