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- /* Copyright (C) 1996, 1997 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.
- */
-
- /* gxdcolor.c */
- /* Pure and null device color implementation */
- #include "gx.h"
- #include "gsbittab.h"
- #include "gxdcolor.h"
- #include "gxdevice.h"
-
- /* Define the standard device color types. */
- private dev_color_proc_load(gx_dc_no_load);
- private dev_color_proc_fill_rectangle(gx_dc_no_fill_rectangle);
- private dev_color_proc_fill_masked(gx_dc_no_fill_masked);
- private dev_color_proc_load(gx_dc_pure_load);
- private dev_color_proc_fill_rectangle(gx_dc_pure_fill_rectangle);
- private dev_color_proc_fill_masked(gx_dc_pure_fill_masked);
- const gx_device_color_procs
- gx_dc_procs_none =
- { gx_dc_no_load, gx_dc_no_fill_rectangle, gx_dc_no_fill_masked, 0, 0 },
- /* null is different from none, but it has the same procedures. */
- gx_dc_procs_null =
- { gx_dc_no_load, gx_dc_no_fill_rectangle, gx_dc_no_fill_masked, 0, 0 },
- gx_dc_procs_pure =
- { gx_dc_pure_load, gx_dc_pure_fill_rectangle, gx_dc_pure_fill_masked, 0, 0 };
- #undef gx_dc_type_none
- const gx_device_color_procs _ds *gx_dc_type_none = &gx_dc_procs_none;
- #define gx_dc_type_none (&gx_dc_procs_none)
- #undef gx_dc_type_null
- const gx_device_color_procs _ds *gx_dc_type_null = &gx_dc_procs_null;
- #define gx_dc_type_null (&gx_dc_procs_null)
- #undef gx_dc_type_pure
- const gx_device_color_procs _ds *gx_dc_type_pure = &gx_dc_procs_pure;
- #define gx_dc_type_pure (&gx_dc_procs_pure)
-
- /* Define a null RasterOp source (for black = 0). */
- const gx_rop_source_t gx_rop_no_source_0 = { gx_rop_no_source_body(0) };
-
- /* ------ Null color ------ */
-
- private int
- gx_dc_no_load(gx_device_color *pdevc, const gs_imager_state *ignore_pis,
- gx_device *ignore_dev, gs_color_select_t ignore_select)
- { return 0;
- }
-
- private int
- gx_dc_no_fill_rectangle(const gx_device_color *pdevc, int x, int y,
- int w, int h, gx_device *dev, gs_logical_operation_t lop,
- const gx_rop_source_t *source)
- { return 0;
- }
-
- private int
- gx_dc_no_fill_masked(const gx_device_color *pdevc, const byte *data,
- int data_x, int raster, gx_bitmap_id id, int x, int y, int w, int h,
- gx_device *dev, gs_logical_operation_t lop, bool invert)
- { return 0;
- }
-
- /* ------ Pure color ------ */
-
- private int
- gx_dc_pure_load(gx_device_color *pdevc, const gs_imager_state *ignore_pis,
- gx_device *ignore_dev, gs_color_select_t ignore_select)
- { return 0;
- }
-
- /* Fill a rectangle with a pure color. */
- /* Note that we treat this as "texture" for RasterOp. */
- private int
- gx_dc_pure_fill_rectangle(const gx_device_color *pdevc, int x, int y,
- int w, int h, gx_device *dev, gs_logical_operation_t lop,
- const gx_rop_source_t *source)
- { if ( source == NULL && lop_no_S_is_T(lop) )
- return (*dev_proc(dev, fill_rectangle))(dev, x, y, w, h,
- pdevc->colors.pure);
- { gx_color_index colors[2];
- gx_rop_source_t no_source;
-
- colors[0] = colors[1] = pdevc->colors.pure;
- if ( source == NULL )
- set_rop_no_source(source, no_source, dev);
- return (*dev_proc(dev, strip_copy_rop))
- (dev, source->sdata, source->sourcex, source->sraster,
- source->id, (source->use_scolors ? source->scolors : NULL),
- NULL /*arbitrary*/, colors, x, y, w, h, 0, 0, lop);
- }
- }
-
- /* Fill a mask with a pure color. */
- /* Note that there is no source in this case: the mask is the source. */
- private int
- gx_dc_pure_fill_masked(const gx_device_color *pdevc, const byte *data,
- int data_x, int raster, gx_bitmap_id id, int x, int y, int w, int h,
- gx_device *dev, gs_logical_operation_t lop, bool invert)
- { if ( lop_no_S_is_T(lop) )
- { gx_color_index color0, color1;
- if ( invert )
- color0 = pdevc->colors.pure, color1 = gx_no_color_index;
- else
- color1 = pdevc->colors.pure, color0 = gx_no_color_index;
- return (*dev_proc(dev, copy_mono))
- (dev, data, data_x, raster, id, x, y, w, h, color0, color1);
- }
- { gx_color_index scolors[2];
- gx_color_index tcolors[2];
-
- scolors[0] = (*dev_proc(dev, map_rgb_color))
- (dev, (gx_color_value)0, (gx_color_value)0, (gx_color_value)0);
- scolors[1] = (*dev_proc(dev, map_rgb_color))
- (dev, gx_max_color_value, gx_max_color_value, gx_max_color_value);
- tcolors[0] = tcolors[1] = pdevc->colors.pure;
- return (*dev_proc(dev, strip_copy_rop))
- (dev, data, data_x, raster, id, scolors,
- NULL, tcolors, x, y, w, h, 0, 0,
- (invert ? rop3_invert_S(lop) : lop) | lop_S_transparent);
- }
- }
-
- /* ------ Default implementations ------ */
-
- /* Fill a mask with a color by parsing the mask into rectangles. */
- int
- gx_dc_default_fill_masked(const gx_device_color *pdevc, const byte *data,
- int data_x, int raster, gx_bitmap_id id, int x, int y, int w, int h,
- gx_device *dev, gs_logical_operation_t lop, bool invert)
- { int lbit = data_x & 7;
- const byte *row = data + (data_x >> 3);
- uint one = (invert ? 0 : 0xff);
- uint zero = one ^ 0xff;
- int iy;
-
- for ( iy = 0; iy < h; ++iy, row += raster )
- { const byte *p = row;
- int bit = lbit;
- int left = w;
- int l0;
-
- while ( left )
- { int run, code;
-
- /* Skip a run of zeros. */
- run = byte_bit_run_length[bit][*p ^ one];
- if ( run )
- { if ( run < 8 )
- { if ( run >= left )
- break; /* end of row while skipping */
- bit += run, left -= run;
- }
- else if ( (run -= 8) >= left )
- break; /* end of row while skipping */
- else
- { left -= run;
- ++p;
- while ( left > 8 && *p == zero )
- left -= 8, ++p;
- run = byte_bit_run_length_0[*p ^ one];
- if ( run >= left ) /* run < 8 unless very last byte */
- break; /* end of row while skipping */
- else
- bit = run & 7, left -= run;
- }
- }
-
- l0 = left;
- /* Scan a run of ones, and then paint it. */
- run = byte_bit_run_length[bit][*p ^ zero];
- if ( run < 8 )
- { if ( run >= left )
- left = 0;
- else
- bit += run, left -= run;
- }
- else if ( (run -= 8) >= left )
- left = 0;
- else
- { left -= run;
- ++p;
- while ( left > 8 && *p == one )
- left -= 8, ++p;
- run = byte_bit_run_length_0[*p ^ zero];
- if ( run >= left ) /* run < 8 unless very last byte */
- left = 0;
- else
- bit = run & 7, left -= run;
- }
- code = gx_device_color_fill_rectangle(pdevc,
- x + w - l0, y + iy, l0 - left, 1, dev, lop, NULL);
- if ( code < 0 )
- return code;
- }
- }
- return 0;
- }
-