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- /* Copyright (C) 1996, 2000 Aladdin Enterprises. All rights reserved.
-
- This file is part of AFPL Ghostscript.
-
- AFPL 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 Free Public License (the
- "License") for full details.
-
- Every copy of AFPL 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 AFPL 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.
- */
-
- /*$Id: gxdcolor.c,v 1.3 2000/09/19 19:00:35 lpd Exp $ */
- /* Pure and null device color implementation */
- #include "gx.h"
- #include "gserrors.h"
- #include "gsbittab.h"
- #include "gxdcolor.h"
- #include "gxdevice.h"
-
- /* Define the standard device color types. */
-
- /* 'none' means the color is not defined. */
- 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_equal(gx_dc_no_equal);
- const gx_device_color_type_t gx_dc_type_data_none = {
- &st_bytes,
- gx_dc_no_load, gx_dc_no_fill_rectangle, gx_dc_no_fill_masked,
- gx_dc_no_equal
- };
- #undef gx_dc_type_none
- const gx_device_color_type_t *const gx_dc_type_none = &gx_dc_type_data_none;
- #define gx_dc_type_none (&gx_dc_type_data_none)
-
- /* 'null' means the color has no effect when used for drawing. */
- private dev_color_proc_load(gx_dc_null_load);
- private dev_color_proc_fill_rectangle(gx_dc_null_fill_rectangle);
- private dev_color_proc_fill_masked(gx_dc_null_fill_masked);
- private dev_color_proc_equal(gx_dc_null_equal);
- const gx_device_color_type_t gx_dc_type_data_null = {
- &st_bytes,
- gx_dc_null_load, gx_dc_null_fill_rectangle, gx_dc_null_fill_masked,
- gx_dc_null_equal
- };
- #undef gx_dc_type_null
- const gx_device_color_type_t *const gx_dc_type_null = &gx_dc_type_data_null;
- #define gx_dc_type_null (&gx_dc_type_data_null)
-
- 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);
- private dev_color_proc_equal(gx_dc_pure_equal);
- const gx_device_color_type_t gx_dc_type_data_pure = {
- &st_bytes,
- gx_dc_pure_load, gx_dc_pure_fill_rectangle, gx_dc_pure_fill_masked,
- gx_dc_pure_equal
- };
- #undef gx_dc_type_pure
- const gx_device_color_type_t *const gx_dc_type_pure = &gx_dc_type_data_pure;
- #define gx_dc_type_pure (&gx_dc_type_data_pure)
-
- /*
- * Get the black and white pixel values of a device. The documentation for
- * the driver API says that map_rgb_color will do the right thing on CMYK
- * devices. Unfortunately, that isn't true at present, and fixing it is too
- * much work.
- */
- gx_color_index
- gx_device_black(gx_device *dev)
- {
- if (dev->cached_colors.black == gx_no_color_index)
- dev->cached_colors.black =
- (dev->color_info.num_components == 4 ?
- (*dev_proc(dev, map_cmyk_color))
- (dev, (gx_color_index)0, (gx_color_index)0, (gx_color_index)0,
- gx_max_color_value) :
- (*dev_proc(dev, map_rgb_color))
- (dev, (gx_color_index)0, (gx_color_index)0, (gx_color_index)0));
- return dev->cached_colors.black;
- }
- gx_color_index
- gx_device_white(gx_device *dev)
- {
- if (dev->cached_colors.white == gx_no_color_index)
- dev->cached_colors.white =
- (dev->color_info.num_components == 4 ?
- (*dev_proc(dev, map_cmyk_color))
- (dev, (gx_color_index)0, (gx_color_index)0, (gx_color_index)0,
- (gx_color_index)0) :
- (*dev_proc(dev, map_rgb_color))
- (dev, gx_max_color_value, gx_max_color_value, gx_max_color_value));
- return dev->cached_colors.white;
- }
-
- /* Clear the color cache. */
- void
- gx_device_decache_colors(gx_device *dev)
- {
- dev->cached_colors.black = dev->cached_colors.white = gx_no_color_index;
- }
-
- /* Set a null RasterOp source. */
- private const gx_rop_source_t gx_rop_no_source_0 = {gx_rop_no_source_body(0)};
- private const gx_rop_source_t gx_rop_no_source_1 = {gx_rop_no_source_body(1)};
- void
- gx_set_rop_no_source(const gx_rop_source_t **psource,
- gx_rop_source_t *pno_source, gx_device *dev)
- {
- gx_color_index black;
-
- top:
- black = dev->cached_colors.black;
- if (black == 0)
- *psource = &gx_rop_no_source_0;
- else if (black == 1)
- *psource = &gx_rop_no_source_1;
- else if (black == gx_no_color_index) { /* cache not loaded */
- discard(gx_device_black(dev));
- goto top;
- } else {
- *pno_source = gx_rop_no_source_0;
- gx_rop_source_set_color(pno_source, black);
- *psource = pno_source;
- }
- }
-
- /* Test device colors for equality. */
- bool
- gx_device_color_equal(const gx_device_color *pdevc1,
- const gx_device_color *pdevc2)
- {
- return pdevc1->type->equal(pdevc1, pdevc2);
- }
-
- /* ------ Undefined 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)
- {
- gx_device_color filler;
-
- if (w <= 0 || h <= 0)
- return 0;
- if (lop_uses_T(lop))
- return_error(gs_error_Fatal);
- color_set_pure(&filler, 0); /* any valid value for dev will do */
- return gx_dc_pure_fill_rectangle(&filler, x, y, w, h, dev, lop, source);
- }
-
- 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)
- {
- if (w <= 0 || h <= 0)
- return 0;
- return_error(gs_error_Fatal);
- }
-
- private bool
- gx_dc_no_equal(const gx_device_color *pdevc1, const gx_device_color *pdevc2)
- {
- return false;
- }
-
- /* ------ Null color ------ */
-
- private int
- gx_dc_null_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_null_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_null_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;
- }
-
- private bool
- gx_dc_null_equal(const gx_device_color * pdevc1, const gx_device_color * pdevc2)
- {
- return pdevc2->type == pdevc1->type;
- }
-
- /* ------ 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] = gx_device_black(dev);
- scolors[1] = gx_device_white(dev);
- 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);
- }
- }
-
- private bool
- gx_dc_pure_equal(const gx_device_color * pdevc1, const gx_device_color * pdevc2)
- {
- return pdevc2->type == pdevc1->type &&
- gx_dc_pure_color(pdevc1) == gx_dc_pure_color(pdevc2);
- }
-
- /* ------ Halftone color initialization ------ */
-
- void
- gx_complete_rgb_halftone(gx_device_color *pdevc, gx_device_halftone *pdht)
- {
- pdevc->type = gx_dc_type_ht_colored;
- pdevc->colors.colored.c_ht = pdht;
- pdevc->colors.colored.plane_mask =
- (pdevc->colors.colored.c_level[0] != 0) |
- ((pdevc->colors.colored.c_level[1] != 0) << 1) |
- ((pdevc->colors.colored.c_level[2] != 0) << 2);
- /*
- * Color rendering won't use the fourth component, but the code that
- * writes and reads colored halftones in the band list doesn't know that.
- */
- pdevc->colors.colored.c_base[3] = 0;
- pdevc->colors.colored.c_level[3] = 0;
- }
-
- void
- gx_complete_cmyk_halftone(gx_device_color *pdevc, gx_device_halftone *pdht)
- {
- pdevc->type = gx_dc_type_ht_colored;
- pdevc->colors.colored.c_ht = pdht;
- pdevc->colors.colored.alpha = max_ushort;
- pdevc->colors.colored.plane_mask =
- (pdevc->colors.colored.c_level[0] != 0) |
- ((pdevc->colors.colored.c_level[1] != 0) << 1) |
- ((pdevc->colors.colored.c_level[2] != 0) << 2) |
- ((pdevc->colors.colored.c_level[3] != 0) << 3);
- }
-
- /* ------ 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;
- }
-