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- /* Copyright (C) 1995, 1999 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: gsdevmem.c,v 1.2 2000/09/19 19:00:27 lpd Exp $ */
- /* Memory device creation for Ghostscript library */
- #include "math_.h" /* for fabs */
- #include "memory_.h"
- #include "gx.h"
- #include "gserrors.h"
- #include "gsdevice.h" /* for prototypes */
- #include "gxarith.h"
- #include "gxdevice.h"
- #include "gxdevmem.h"
-
- /* Make a memory (image) device. */
- /* If colors_size = -16, -24, or -32, this is a true-color device; */
- /* otherwise, colors_size is the size of the palette in bytes */
- /* (2^N for gray scale, 3*2^N for RGB color). */
- /* We separate device allocation and initialization at customer request. */
- int
- gs_initialize_wordimagedevice(gx_device_memory * new_dev, const gs_matrix * pmat,
- uint width, uint height, const byte * colors, int colors_size,
- bool word_oriented, bool page_device, gs_memory_t * mem)
- {
- const gx_device_memory *proto_dev;
- int palette_count = colors_size;
- int num_components = 1;
- int pcount;
- int bits_per_pixel;
- float x_pixels_per_unit, y_pixels_per_unit;
- byte palette[256 * 3];
- bool has_color;
-
- switch (colors_size) {
- case 3 * 2:
- palette_count = 2;
- num_components = 3;
- case 2:
- bits_per_pixel = 1;
- break;
- case 3 * 4:
- palette_count = 4;
- num_components = 3;
- case 4:
- bits_per_pixel = 2;
- break;
- case 3 * 16:
- palette_count = 16;
- num_components = 3;
- case 16:
- bits_per_pixel = 4;
- break;
- case 3 * 256:
- palette_count = 256;
- num_components = 3;
- case 256:
- bits_per_pixel = 8;
- break;
- case -16:
- bits_per_pixel = 16;
- palette_count = 0;
- break;
- case -24:
- bits_per_pixel = 24;
- palette_count = 0;
- break;
- case -32:
- bits_per_pixel = 32;
- palette_count = 0;
- break;
- default:
- return_error(gs_error_rangecheck);
- }
- proto_dev = (word_oriented ?
- gdev_mem_word_device_for_bits(bits_per_pixel) :
- gdev_mem_device_for_bits(bits_per_pixel));
- if (proto_dev == 0) /* no suitable device */
- return_error(gs_error_rangecheck);
- pcount = palette_count * 3;
- /* Check to make sure the palette contains white and black, */
- /* and, if it has any colors, the six primaries. */
- if (bits_per_pixel <= 8) {
- const byte *p;
- byte *q;
- int primary_mask = 0;
- int i;
-
- has_color = false;
- for (i = 0, p = colors, q = palette;
- i < palette_count; i++, q += 3
- ) {
- int mask = 1;
-
- switch (num_components) {
- case 1: /* gray */
- q[0] = q[1] = q[2] = *p++;
- break;
- default /* case 3 */ : /* RGB */
- q[0] = p[0], q[1] = p[1], q[2] = p[2];
- p += 3;
- }
- #define shift_mask(b,n)\
- switch ( b ) { case 0xff: mask <<= n; case 0: break; default: mask = 0; }
- shift_mask(q[0], 4);
- shift_mask(q[1], 2);
- shift_mask(q[2], 1);
- #undef shift_mask
- primary_mask |= mask;
- if (q[0] != q[1] || q[0] != q[2])
- has_color = true;
- }
- switch (primary_mask) {
- case 129: /* just black and white */
- if (has_color) /* color but no primaries */
- return_error(gs_error_rangecheck);
- case 255: /* full color */
- break;
- default:
- return_error(gs_error_rangecheck);
- }
- } else
- has_color = true;
- /*
- * The initial transformation matrix must map 1 user unit to
- * 1/72". Let W and H be the width and height in pixels, and
- * assume the initial matrix is of the form [A 0 0 B X Y].
- * Then the size of the image in user units is (W/|A|,H/|B|),
- * hence the size in inches is ((W/|A|)/72,(H/|B|)/72), so
- * the number of pixels per inch is
- * (W/((W/|A|)/72),H/((H/|B|)/72)), or (|A|*72,|B|*72).
- * Similarly, if the initial matrix is [0 A B 0 X Y] for a 90
- * or 270 degree rotation, the size of the image in user
- * units is (W/|B|,H/|A|), so the pixels per inch are
- * (|B|*72,|A|*72). We forbid non-orthogonal transformation
- * matrices.
- */
- if (is_fzero2(pmat->xy, pmat->yx))
- x_pixels_per_unit = pmat->xx, y_pixels_per_unit = pmat->yy;
- else if (is_fzero2(pmat->xx, pmat->yy))
- x_pixels_per_unit = pmat->yx, y_pixels_per_unit = pmat->xy;
- else
- return_error(gs_error_undefinedresult);
- /* All checks done, initialize the device. */
- if (bits_per_pixel == 1) {
- /* Determine the polarity from the palette. */
- gs_make_mem_device(new_dev, proto_dev, mem,
- (page_device ? 1 : -1), 0);
- /* This is somewhat bogus, but does the right thing */
- /* in the only cases we care about. */
- gdev_mem_mono_set_inverted(new_dev,
- (palette[0] | palette[1] | palette[2]) != 0);
- } else {
- byte *dev_palette = gs_alloc_string(mem, pcount,
- "gs_makeimagedevice(palette)");
-
- if (dev_palette == 0)
- return_error(gs_error_VMerror);
- gs_make_mem_device(new_dev, proto_dev, mem,
- (page_device ? 1 : -1), 0);
- new_dev->palette.size = pcount;
- new_dev->palette.data = dev_palette;
- memcpy(dev_palette, palette, pcount);
- if (!has_color) {
- new_dev->color_info.num_components = 1;
- new_dev->color_info.max_color = 0;
- new_dev->color_info.dither_colors = 0;
- }
- }
- new_dev->initial_matrix = *pmat;
- new_dev->MarginsHWResolution[0] = new_dev->HWResolution[0] =
- fabs(x_pixels_per_unit) * 72;
- new_dev->MarginsHWResolution[1] = new_dev->HWResolution[1] =
- fabs(y_pixels_per_unit) * 72;
- gx_device_set_width_height((gx_device *) new_dev, width, height);
- /* Set the ImagingBBox so we get a correct clipping region. */
- {
- gs_rect bbox;
-
- bbox.p.x = 0;
- bbox.p.y = 0;
- bbox.q.x = width;
- bbox.q.y = height;
- gs_bbox_transform_inverse(&bbox, pmat, &bbox);
- new_dev->ImagingBBox[0] = bbox.p.x;
- new_dev->ImagingBBox[1] = bbox.p.y;
- new_dev->ImagingBBox[2] = bbox.q.x;
- new_dev->ImagingBBox[3] = bbox.q.y;
- new_dev->ImagingBBox_set = true;
- }
- /* The bitmap will be allocated when the device is opened. */
- new_dev->is_open = false;
- new_dev->bitmap_memory = mem;
- return 0;
- }
-
- int
- gs_makewordimagedevice(gx_device ** pnew_dev, const gs_matrix * pmat,
- uint width, uint height, const byte * colors, int num_colors,
- bool word_oriented, bool page_device, gs_memory_t * mem)
- {
- int code;
- gx_device_memory *pnew =
- gs_alloc_struct(mem, gx_device_memory, &st_device_memory,
- "gs_makeimagedevice(device)");
-
- if (pnew == 0)
- return_error(gs_error_VMerror);
- code = gs_initialize_wordimagedevice(pnew, pmat, width, height,
- colors, num_colors, word_oriented,
- page_device, mem);
- if (code < 0) {
- gs_free_object(mem, pnew, "gs_makeimagedevice(device)");
- return code;
- }
- *pnew_dev = (gx_device *) pnew;
- return 0;
- }
-