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 /*

  * Copyright © 2009 Red Hat, Inc.

  * Copyright © 2000 SuSE, Inc.

  * Copyright © 2007 Red Hat, Inc.

  * Copyright © 2000 Keith Packard, member of The XFree86 Project, Inc.

  *             2005 Lars Knoll & Zack Rusin, Trolltech

  *             2008 Aaron Plattner, NVIDIA Corporation

  *

  * Permission to use, copy, modify, distribute, and sell this software and its

  * documentation for any purpose is hereby granted without fee, provided that

  * the above copyright notice appear in all copies and that both that

  * copyright notice and this permission notice appear in supporting

  * documentation, and that the name of Red Hat not be used in advertising or

  * publicity pertaining to distribution of the software without specific,

  * written prior permission.  Red Hat makes no representations about the

  * suitability of this software for any purpose.  It is provided "as is"

  * without express or implied warranty.

  *

  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS

  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND

  * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY

  * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN

  * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING

  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS

  * SOFTWARE.

  */

 #ifdef HAVE_CONFIG_H

 #include <config.h>

 #endif

 #include <stdlib.h>

 #include <string.h>

 #include <math.h>

 #include <limits.h>

 #include <stdio.h>

 #include <stdlib.h>

 #include <string.h>

 #include "pixman-private.h"

 static pixman_bool_t

 general_src_iter_init (pixman_implementation_t *imp, pixman_iter_t *iter)

 {

     pixman_image_t *image = iter->image;

     if (image->type == LINEAR)

 	_pixman_linear_gradient_iter_init (image, iter);

     else if (image->type == RADIAL)

 	_pixman_radial_gradient_iter_init (image, iter);

     else if (image->type == CONICAL)

 	_pixman_conical_gradient_iter_init (image, iter);

     else if (image->type == BITS)

 	_pixman_bits_image_src_iter_init (image, iter);

     else if (image->type == SOLID)

         _pixman_log_error (FUNC, "Solid image not handled by noop");

     else         

 	_pixman_log_error (FUNC, "Pixman bug: unknown image type\n");

     return TRUE;

 }

 static pixman_bool_t

 general_dest_iter_init (pixman_implementation_t *imp, pixman_iter_t *iter)

 {

     if (iter->image->type == BITS)

     {

 	_pixman_bits_image_dest_iter_init (iter->image, iter);

 	return TRUE;

     }

     else

     {

 	_pixman_log_error (FUNC, "Trying to write to a non-writable image");

 	return FALSE;

     }

 }

 typedef struct op_info_t op_info_t;

 struct op_info_t

 {

     uint8_t src, dst;

 };

 #define ITER_IGNORE_BOTH						\

     (ITER_IGNORE_ALPHA | ITER_IGNORE_RGB | ITER_LOCALIZED_ALPHA)

 static const op_info_t op_flags[PIXMAN_N_OPERATORS] =

 {

     /* Src                   Dst                   */

     { ITER_IGNORE_BOTH,      ITER_IGNORE_BOTH      }, /* CLEAR */

     { ITER_LOCALIZED_ALPHA,  ITER_IGNORE_BOTH      }, /* SRC */

     { ITER_IGNORE_BOTH,      ITER_LOCALIZED_ALPHA  }, /* DST */

     { 0,                     ITER_LOCALIZED_ALPHA  }, /* OVER */

     { ITER_LOCALIZED_ALPHA,  0                     }, /* OVER_REVERSE */

     { ITER_LOCALIZED_ALPHA,  ITER_IGNORE_RGB       }, /* IN */

     { ITER_IGNORE_RGB,       ITER_LOCALIZED_ALPHA  }, /* IN_REVERSE */

     { ITER_LOCALIZED_ALPHA,  ITER_IGNORE_RGB       }, /* OUT */

     { ITER_IGNORE_RGB,       ITER_LOCALIZED_ALPHA  }, /* OUT_REVERSE */

     { 0,                     0                     }, /* ATOP */

     { 0,                     0                     }, /* ATOP_REVERSE */

     { 0,                     0                     }, /* XOR */

     { ITER_LOCALIZED_ALPHA,  ITER_LOCALIZED_ALPHA  }, /* ADD */

     { 0,                     0                     }, /* SATURATE */

 };

 #define SCANLINE_BUFFER_LENGTH 8192

 static void

 general_composite_rect  (pixman_implementation_t *imp,

                          pixman_composite_info_t *info)

 {

     PIXMAN_COMPOSITE_ARGS (info);

     uint64_t stack_scanline_buffer[(SCANLINE_BUFFER_LENGTH * 3 + 7) / 8];

     uint8_t *scanline_buffer = (uint8_t *) stack_scanline_buffer;

     uint8_t *src_buffer, *mask_buffer, *dest_buffer;

     pixman_iter_t src_iter, mask_iter, dest_iter;

     pixman_combine_32_func_t compose;

     pixman_bool_t component_alpha;

     iter_flags_t narrow, src_iter_flags;

     iter_flags_t rgb16;

     int Bpp;

     int i;

     if ((src_image->common.flags & FAST_PATH_NARROW_FORMAT)		    &&

 	(!mask_image || mask_image->common.flags & FAST_PATH_NARROW_FORMAT) &&

 	(dest_image->common.flags & FAST_PATH_NARROW_FORMAT))

     {

 	narrow = ITER_NARROW;

 	Bpp = 4;

     }

     else

     {

 	narrow = 0;

 	Bpp = 16;

     }

     // XXX: This special casing is bad. Ideally, we'd keep the general code general perhaps

     // by having it deal more specifically with different intermediate formats

     if (

 	(dest_image->common.flags & FAST_PATH_16_FORMAT && (src_image->type == LINEAR || src_image->type == RADIAL)) &&

 	( op == PIXMAN_OP_SRC ||

          (op == PIXMAN_OP_OVER && (src_image->common.flags & FAST_PATH_IS_OPAQUE))

 	)

 	) {

 	rgb16 = ITER_16;

     } else {

 	rgb16 = 0;

     }

     if (width * Bpp > SCANLINE_BUFFER_LENGTH)

     {

 	scanline_buffer = pixman_malloc_abc (width, 3, Bpp);

 	if (!scanline_buffer)

 	    return;

     }

     src_buffer = scanline_buffer;

     mask_buffer = src_buffer + width * Bpp;

     dest_buffer = mask_buffer + width * Bpp;

     if (!narrow)

     {

 	/* To make sure there aren't any NANs in the buffers */

 	memset (src_buffer, 0, width * Bpp);

 	memset (mask_buffer, 0, width * Bpp);

 	memset (dest_buffer, 0, width * Bpp);

     }

     /* src iter */

     src_iter_flags = narrow | op_flags[op].src | rgb16;

     _pixman_implementation_src_iter_init (imp->toplevel, &src_iter, src_image,

 					  src_x, src_y, width, height,

 					  src_buffer, src_iter_flags, info->src_flags);

     /* mask iter */

     if ((src_iter_flags & (ITER_IGNORE_ALPHA | ITER_IGNORE_RGB)) ==

 	(ITER_IGNORE_ALPHA | ITER_IGNORE_RGB))

     {

 	/* If it doesn't matter what the source is, then it doesn't matter

 	 * what the mask is

 	 */

 	mask_image = NULL;

     }

     component_alpha =

         mask_image			      &&

         mask_image->common.type == BITS       &&

         mask_image->common.component_alpha    &&

         PIXMAN_FORMAT_RGB (mask_image->bits.format);

     _pixman_implementation_src_iter_init (

 	imp->toplevel, &mask_iter, mask_image, mask_x, mask_y, width, height,

 	mask_buffer, narrow | (component_alpha? 0 : ITER_IGNORE_RGB), info->mask_flags);

     /* dest iter */

     _pixman_implementation_dest_iter_init (

 	imp->toplevel, &dest_iter, dest_image, dest_x, dest_y, width, height,

 	dest_buffer, narrow | op_flags[op].dst | rgb16, info->dest_flags);

     compose = _pixman_implementation_lookup_combiner (

 	imp->toplevel, op, component_alpha, narrow, !!rgb16);

     for (i = 0; i < height; ++i)

     {

 	uint32_t *s, *m, *d;

 	m = mask_iter.get_scanline (&mask_iter, NULL);

 	s = src_iter.get_scanline (&src_iter, m);

 	d = dest_iter.get_scanline (&dest_iter, NULL);

 	compose (imp->toplevel, op, d, s, m, width);

 	dest_iter.write_back (&dest_iter);

     }

     if (scanline_buffer != (uint8_t *) stack_scanline_buffer)

 	free (scanline_buffer);

 }

 static const pixman_fast_path_t general_fast_path[] =

 {

     { PIXMAN_OP_any, PIXMAN_any, 0, PIXMAN_any,	0, PIXMAN_any, 0, general_composite_rect },

     { PIXMAN_OP_NONE }

 };

 pixman_implementation_t *

 _pixman_implementation_create_general (void)

 {

     pixman_implementation_t *imp = _pixman_implementation_create (NULL, general_fast_path);

     _pixman_setup_combiner_functions_16 (imp);

     _pixman_setup_combiner_functions_32 (imp);

     _pixman_setup_combiner_functions_float (imp);

     imp->src_iter_init = general_src_iter_init;

     imp->dest_iter_init = general_dest_iter_init;

     return imp;

 }