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- /* Copyright (C) 1992, 1995, 1996 Aladdin Enterprises. All rights reserved.
-
- This file is part of Aladdin Ghostscript.
-
- Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND. No author
- or distributor accepts any responsibility for the consequences of using it,
- or for whether it serves any particular purpose or works at all, unless he
- or she says so in writing. Refer to the Aladdin Ghostscript Free Public
- License (the "License") for full details.
-
- Every copy of Aladdin Ghostscript must include a copy of the License,
- normally in a plain ASCII text file named PUBLIC. The License grants you
- the right to copy, modify and redistribute Aladdin Ghostscript, but only
- under certain conditions described in the License. Among other things, the
- License requires that the copyright notice and this notice be preserved on
- all copies.
- */
-
- /* gdevm4.c */
- /* 4-bit-per-pixel "memory" (stored bitmap) device */
- #include "memory_.h"
- #include "gx.h"
- #include "gxdevice.h"
- #include "gxdevmem.h" /* semi-public definitions */
- #include "gdevmem.h" /* private definitions */
-
- /**************** NOTE: copy_rop only works for gray scale ****************/
- extern dev_proc_strip_copy_rop(mem_gray_strip_copy_rop);
-
- /* ================ Standard (byte-oriented) device ================ */
-
- #undef chunk
- #define chunk byte
- #define fpat(byt) mono_fill_make_pattern(byt)
-
- /* Procedures */
- declare_mem_procs(mem_mapped4_copy_mono, mem_mapped4_copy_color, mem_mapped4_fill_rectangle);
-
- /* The device descriptor. */
- const gx_device_memory far_data mem_mapped4_device =
- mem_device("image4", 4, 0,
- mem_mapped_map_rgb_color, mem_mapped_map_color_rgb,
- mem_mapped4_copy_mono, mem_mapped4_copy_color, mem_mapped4_fill_rectangle,
- mem_gray_strip_copy_rop);
-
- /* Convert x coordinate to byte offset in scan line. */
- #undef x_to_byte
- #define x_to_byte(x) ((x) >> 1)
-
- /* Define the 4-bit fill patterns. */
- static const mono_fill_chunk tile_patterns[16] =
- { fpat(0x00), fpat(0x11), fpat(0x22), fpat(0x33),
- fpat(0x44), fpat(0x55), fpat(0x66), fpat(0x77),
- fpat(0x88), fpat(0x99), fpat(0xaa), fpat(0xbb),
- fpat(0xcc), fpat(0xdd), fpat(0xee), fpat(0xff)
- };
-
-
- /* Fill a rectangle with a color. */
- private int
- mem_mapped4_fill_rectangle(gx_device *dev,
- int x, int y, int w, int h, gx_color_index color)
- { fit_fill(dev, x, y, w, h);
- bits_fill_rectangle(scan_line_base(mdev, y), x << 2, mdev->raster,
- tile_patterns[color], w << 2, h);
- return 0;
- }
-
- /* Copy a bitmap. */
- private int
- mem_mapped4_copy_mono(gx_device *dev,
- const byte *base, int sourcex, int sraster, gx_bitmap_id id,
- int x, int y, int w, int h, gx_color_index zero, gx_color_index one)
- { const byte *line;
- int first_bit;
- byte first_mask, b0, b1;
- declare_scan_ptr(dest);
- fit_copy(dev, base, sourcex, sraster, id, x, y, w, h);
- setup_rect(dest);
- line = base + (sourcex >> 3);
- first_bit = 0x80 >> (sourcex & 7);
- first_mask = (x & 1 ? 0xf : 0xf0);
- b0 = ((byte)zero << 4) + (byte)zero;
- b1 = ((byte)one << 4) + (byte)one;
- while ( h-- > 0 )
- { register byte *pptr = (byte *)dest;
- const byte *sptr = line;
- register int sbyte = *sptr++;
- register int bit = first_bit;
- register byte mask = first_mask;
- int count = w;
- do
- { if ( sbyte & bit )
- { if ( one != gx_no_color_index )
- *pptr = (*pptr & ~mask) + (b1 & mask);
- }
- else
- { if ( zero != gx_no_color_index )
- *pptr = (*pptr & ~mask) + (b0 & mask);
- }
- if ( (bit >>= 1) == 0 )
- bit = 0x80, sbyte = *sptr++;
- if ( (mask = ~mask) == 0xf0 )
- pptr++;
- }
- while ( --count > 0 );
- line += sraster;
- inc_ptr(dest, draster);
- }
- return 0;
- }
-
- /* Copy a color bitmap. */
- private int
- mem_mapped4_copy_color(gx_device *dev,
- const byte *base, int sourcex, int sraster, gx_bitmap_id id,
- int x, int y, int w, int h)
- { int code;
- fit_copy(dev, base, sourcex, sraster, id, x, y, w, h);
- /* Use monobit copy_mono. */
- /* Patch the width in the device temporarily. */
- dev->width <<= 2;
- code = (*dev_proc(&mem_mono_device, copy_mono))
- (dev, base, sourcex << 2, sraster, id,
- x << 2, y, w << 2, h, (gx_color_index)0, (gx_color_index)1);
- /* Restore the correct width. */
- dev->width >>= 2;
- return code;
- }
-
- /* ================ "Word"-oriented device ================ */
-
- /* Note that on a big-endian machine, this is the same as the */
- /* standard byte-oriented-device. */
-
- #if !arch_is_big_endian
-
- /* Procedures */
- declare_mem_procs(mem4_word_copy_mono, mem4_word_copy_color, mem4_word_fill_rectangle);
-
- /* Here is the device descriptor. */
- const gx_device_memory far_data mem_mapped4_word_device =
- mem_full_device("image4w", 4, 0, mem_open,
- mem_mapped_map_rgb_color, mem_mapped_map_color_rgb,
- mem4_word_copy_mono, mem4_word_copy_color, mem4_word_fill_rectangle,
- mem_word_get_bits, gx_default_map_cmyk_color,
- gx_default_strip_tile_rectangle, gx_no_strip_copy_rop);
-
- /* Fill a rectangle with a color. */
- private int
- mem4_word_fill_rectangle(gx_device *dev, int x, int y, int w, int h,
- gx_color_index color)
- { byte *base;
- uint raster;
- fit_fill(dev, x, y, w, h);
- base = scan_line_base(mdev, y);
- raster = mdev->raster;
- mem_swap_byte_rect(base, raster, x << 2, w << 2, h, true);
- bits_fill_rectangle(base, x << 2, raster,
- tile_patterns[color], w << 2, h);
- mem_swap_byte_rect(base, raster, x << 2, w << 2, h, true);
- return 0;
- }
-
- /* Copy a bitmap. */
- private int
- mem4_word_copy_mono(gx_device *dev,
- const byte *base, int sourcex, int sraster, gx_bitmap_id id,
- int x, int y, int w, int h, gx_color_index zero, gx_color_index one)
- { byte *row;
- uint raster;
- bool store;
- fit_copy(dev, base, sourcex, sraster, id, x, y, w, h);
- row = scan_line_base(mdev, y);
- raster = mdev->raster;
- store = (zero != gx_no_color_index && one != gx_no_color_index);
- mem_swap_byte_rect(row, raster, x << 2, w << 2, h, store);
- mem_mapped4_copy_mono(dev, base, sourcex, sraster, id,
- x, y, w, h, zero, one);
- mem_swap_byte_rect(row, raster, x << 2, w << 2, h, false);
- return 0;
- }
-
- /* Copy a color bitmap. */
- private int
- mem4_word_copy_color(gx_device *dev,
- const byte *base, int sourcex, int sraster, gx_bitmap_id id,
- int x, int y, int w, int h)
- { int code;
- fit_copy(dev, base, sourcex, sraster, id, x, y, w, h);
- /* Use monobit copy_mono. */
- /* Patch the width in the device temporarily. */
- dev->width <<= 2;
- code = (*dev_proc(&mem_mono_word_device, copy_mono))
- (dev, base, sourcex << 2, sraster, id,
- x << 2, y, w << 2, h, (gx_color_index)0, (gx_color_index)1);
- /* Restore the correct width. */
- dev->width >>= 2;
- return code;
- }
-
- #endif /* !arch_is_big_endian */
-