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- /* Copyright (C) 1989, 1992, 1993 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.
- */
-
- /* gscolor.c */
- /* Color and halftone operators for Ghostscript library */
- #include "gx.h"
- #include "gserrors.h"
- #include "gsstruct.h"
- #include "gscspace.h"
- #include "gsccolor.h"
- #include "gxdcconv.h"
- #include "gxdevice.h" /* for gx_color_index */
- #include "gxcmap.h"
- #include "gzstate.h"
-
- /* Define the standard color space types. */
- extern cs_proc_remap_color(gx_remap_DeviceGray);
- extern cs_proc_remap_color(gx_remap_DeviceRGB);
- const gs_color_space_type
- gs_color_space_type_DeviceGray =
- { gs_color_space_index_DeviceGray, 1,
- gx_init_paint_1, gx_remap_DeviceGray, gx_no_install_cspace,
- gx_no_adjust_cspace_count, gx_no_adjust_color_count,
- gx_no_cspace_enum_ptrs, gx_no_cspace_reloc_ptrs
- },
- gs_color_space_type_DeviceRGB =
- { gs_color_space_index_DeviceRGB, 3,
- gx_init_paint_3, gx_remap_DeviceRGB, gx_no_install_cspace,
- gx_no_adjust_cspace_count, gx_no_adjust_color_count,
- gx_no_cspace_enum_ptrs, gx_no_cspace_reloc_ptrs
- };
-
- /* Structure descriptors */
- public_st_color_space();
- public_st_client_color();
-
- /* Initialize colors with 1, 3, or 4 paint components. */
- /* (These are only used by setcolorspace.) */
- void
- gx_init_paint_1(gs_client_color *pcc, const gs_color_space *pcs)
- { pcc->paint.values[0] = 0.0;
- }
- void
- gx_init_paint_3(gs_client_color *pcc, const gs_color_space *pcs)
- { pcc->paint.values[2] = 0.0;
- pcc->paint.values[1] = 0.0;
- pcc->paint.values[0] = 0.0;
- }
-
- /* Null color space installation procedure. */
- int
- gx_no_install_cspace(gs_color_space *pcs, gs_state *pgs)
- { return 0;
- }
-
- /* Null reference count adjustment procedures. */
- void
- gx_no_adjust_cspace_count(const gs_color_space *pcs, gs_state *pgs, int delta)
- {
- }
- void
- gx_no_adjust_color_count(const gs_client_color *pcc, const gs_color_space *pcs, gs_state *pgs, int delta)
- {
- }
-
- /* GC procedures */
-
- #define pcs ((gs_color_space *)vptr)
-
- private ENUM_PTRS_BEGIN_PROC(color_space_enum_ptrs) {
- return (*pcs->type->enum_ptrs)(pcs, size, index, pep);
- ENUM_PTRS_END_PROC }
- private RELOC_PTRS_BEGIN(color_space_reloc_ptrs) {
- (*pcs->type->reloc_ptrs)(pcs, size, gcst);
- } RELOC_PTRS_END
-
- #undef pcs
-
- /* Force a parameter into the range [0.0..1.0]. */
- #define force_unit(p) (p < 0.0 ? 0.0 : p > 1.0 ? 1.0 : p)
- frac gx_color_unit_param(P1(floatp));
-
- /* Forward declarations */
- void load_transfer_map(P3(gs_state *, gx_transfer_map *, floatp));
-
- /* setgray */
- int
- gs_setgray(gs_state *pgs, floatp gray)
- { if ( pgs->in_cachedevice ) return_error(gs_error_undefined);
- cs_adjust_counts(pgs, -1);
- pgs->ccolor->paint.values[0] = gray;
- pgs->color_space->type = &gs_color_space_type_DeviceGray;
- gx_unset_dev_color(pgs);
- return 0;
- }
-
- /* currentgray */
- float
- gs_currentgray(const gs_state *pgs)
- { const gs_client_color *pcc = pgs->ccolor;
- switch ( pgs->color_space->type->index )
- {
- case gs_color_space_index_DeviceGray:
- return pcc->paint.values[0];
- case gs_color_space_index_DeviceRGB:
- return frac2float(color_rgb_to_gray(
- float2frac(pcc->paint.values[0]),
- float2frac(pcc->paint.values[1]),
- float2frac(pcc->paint.values[2]),
- pgs));
- case gs_color_space_index_DeviceCMYK:
- return frac2float(color_cmyk_to_gray(
- float2frac(pcc->paint.values[0]),
- float2frac(pcc->paint.values[1]),
- float2frac(pcc->paint.values[2]),
- float2frac(pcc->paint.values[3]),
- pgs));
- default:
- return 0.0;
- }
- }
-
- /* sethsbcolor */
- int
- gs_sethsbcolor(gs_state *pgs, floatp h, floatp s, floatp b)
- { float rgb[3];
- color_hsb_to_rgb(force_unit(h), force_unit(s), force_unit(b), rgb);
- return gs_setrgbcolor(pgs, rgb[0], rgb[1], rgb[2]);
- }
-
- /* currenthsbcolor */
- int
- gs_currenthsbcolor(const gs_state *pgs, float pr3[3])
- { float rgb[3];
- gs_currentrgbcolor(pgs, rgb);
- color_rgb_to_hsb(rgb[0], rgb[1], rgb[2], pr3);
- return 0;
- }
-
- /* setrgbcolor */
- int
- gs_setrgbcolor(gs_state *pgs, floatp r, floatp g, floatp b)
- { gs_client_color *pcc = pgs->ccolor;
- if ( pgs->in_cachedevice ) return_error(gs_error_undefined);
- cs_adjust_counts(pgs, -1);
- pcc->paint.values[0] = r;
- pcc->paint.values[1] = g;
- pcc->paint.values[2] = b;
- pcc->pattern = 0; /* for GC */
- pgs->color_space->type = &gs_color_space_type_DeviceRGB;
- gx_unset_dev_color(pgs);
- return 0;
- }
-
- /* currentrgbcolor */
- int
- gs_currentrgbcolor(const gs_state *pgs, float pr3[3])
- { const gs_client_color *pcc = pgs->ccolor;
- switch ( pgs->color_space->type->index )
- {
- case gs_color_space_index_DeviceGray:
- pr3[0] = pr3[1] = pr3[2] = pcc->paint.values[0];
- break;
- case gs_color_space_index_DeviceRGB:
- pr3[0] = pcc->paint.values[0];
- pr3[1] = pcc->paint.values[1];
- pr3[2] = pcc->paint.values[2];
- break;
- case gs_color_space_index_DeviceCMYK:
- { frac frgb[3];
- color_cmyk_to_rgb(
- float2frac(pcc->paint.values[0]),
- float2frac(pcc->paint.values[1]),
- float2frac(pcc->paint.values[2]),
- float2frac(pcc->paint.values[3]),
- pgs, frgb);
- pr3[0] = frac2float(frgb[0]);
- pr3[1] = frac2float(frgb[1]);
- pr3[2] = frac2float(frgb[2]);
- } break;
- default:
- pr3[0] = pr3[1] = pr3[2] = 0.0;
- }
- return 0;
- }
-
- /* setalpha */
- int
- gs_setalpha(gs_state *pgs, floatp alpha)
- { pgs->alpha = (gx_color_value)(force_unit(alpha) * gx_max_color_value);
- gx_unset_dev_color(pgs);
- return 0;
- }
-
- /* currentalpha */
- float
- gs_currentalpha(const gs_state *pgs)
- { return (float)pgs->alpha / gx_max_color_value;
- }
-
- /* settransfer */
- /* Remap=0 is used by the interpreter. */
- int
- gs_settransfer(gs_state *pgs, gs_mapping_proc tproc)
- { return gs_settransfer_remap(pgs, tproc, 1);
- }
- int
- gs_settransfer_remap(gs_state *pgs, gs_mapping_proc tproc, int remap)
- { gx_transfer *ptran = &pgs->transfer;
- /* We can safely decrement the reference counts */
- /* of the non-gray transfer maps, because */
- /* if any of them get freed, the rc_unshare can't fail. */
- rc_decrement(ptran->red, pgs->memory, "gs_settransfer");
- rc_decrement(ptran->green, pgs->memory, "gs_settransfer");
- rc_decrement(ptran->blue, pgs->memory, "gs_settransfer");
- rc_unshare_struct(ptran->gray, gx_transfer_map, &st_transfer_map,
- pgs->memory, goto fail, "gs_settransfer");
- ptran->gray->proc = tproc;
- ptran->red = ptran->gray;
- ptran->green = ptran->gray;
- ptran->blue = ptran->gray;
- ptran->gray->rc.ref_count += 3;
- if ( remap )
- { load_transfer_map(pgs, ptran->gray, 0.0);
- gx_unset_dev_color(pgs);
- }
- return 0;
- fail: rc_increment(ptran->red);
- rc_increment(ptran->green);
- rc_increment(ptran->blue);
- return_error(gs_error_VMerror);
- }
-
- /* currenttransfer */
- gs_mapping_proc
- gs_currenttransfer(const gs_state *pgs)
- { return pgs->transfer.gray->proc;
- }
-
- /* ------ Non-operator routines ------ */
-
- /* Set up black for writing into the character cache. */
- void
- gx_set_black(gs_state *pgs)
- { gx_device_color *pdc = pgs->dev_color;
- gs_client_color *pcc = pgs->ccolor;
- pcc->paint.values[0] = 0.0;
- pcc->pattern = 0; /* for GC */
- pgs->color_space->type = &gs_color_space_type_DeviceGray;
- color_set_pure(pdc, 1);
- }
-
- /* Force a parameter into the range [0..1], */
- /* and convert to a frac. */
- frac
- gx_color_unit_param(floatp fval)
- { if ( fval <= 0.0 )
- return frac_0;
- else if ( fval >= 1.0 )
- return frac_1;
- else
- return float2frac(fval);
- }
-
- /* ------ Internal routines ------ */
-
- /* Load one cached transfer map. */
- /* This is exported for gscolor1.c. */
- void
- load_transfer_map(gs_state *pgs, gx_transfer_map *pmap, floatp min_value)
- { gs_mapping_proc proc = pmap->proc;
- frac *values = pmap->values;
- frac fmin = float2frac(min_value);
- int i;
- for ( i = 0; i < transfer_map_size; i++ )
- { float fval = (*proc)(pgs, (float)i / (transfer_map_size - 1));
- values[i] =
- (fval < min_value ? fmin :
- fval >= 1.0 ? frac_1 :
- float2frac(fval));
- }
- }
-