Coverage Report

Created: 2025-06-10 07:27

/src/ghostpdl/base/gdevdsha.c
Line
Count
Source (jump to first uncovered line)
1
/* Copyright (C) 2001-2024 Artifex Software, Inc.
2
   All Rights Reserved.
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4
   This software is provided AS-IS with no warranty, either express or
5
   implied.
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7
   This software is distributed under license and may not be copied,
8
   modified or distributed except as expressly authorized under the terms
9
   of the license contained in the file LICENSE in this distribution.
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11
   Refer to licensing information at http://www.artifex.com or contact
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   Artifex Software, Inc.,  39 Mesa Street, Suite 108A, San Francisco,
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   CA 94129, USA, for further information.
14
*/
15
16
/* Default shading drawing device procedures. */
17
18
#include "gx.h"
19
#include "gserrors.h"
20
#include "gxdevice.h"
21
#include "gxcindex.h"
22
#include "gxdevsop.h"
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24
static bool
25
gx_devn_diff(frac31 devn1[], frac31 devn2[], int num)
26
0
{
27
0
    int k;
28
29
0
    for (k = 0; k < num; k++) {
30
0
        if (devn1[k] != devn2[k]) {
31
0
            return true;
32
0
        }
33
0
    }
34
0
    return false;
35
0
}
36
37
int
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gx_hl_fill_linear_color_scanline(gx_device *dev, const gs_fill_attributes *fa,
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        int i0, int j, int w, const frac31 *c0, const int32_t *c0f,
40
        const int32_t *cg_num, int32_t cg_den)
41
0
{
42
0
    frac31 c[GX_DEVICE_COLOR_MAX_COMPONENTS];
43
0
    frac31 curr[GX_DEVICE_COLOR_MAX_COMPONENTS];
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0
    ulong f[GX_DEVICE_COLOR_MAX_COMPONENTS];
45
0
    int i, i1 = i0 + w, bi = i0, k;
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0
    const gx_device_color_info *cinfo = &dev->color_info;
47
0
    int n = cinfo->num_components;
48
0
    int si, ei, di, code;
49
0
    gs_fixed_rect rect;
50
0
    gx_device_color devc;
51
52
    /* Note: All the stepping math is done with frac color values */
53
54
0
    devc.type = gx_dc_type_devn;
55
56
0
    if (j < fixed2int(fa->clip->p.y) ||
57
0
            j > fixed2int_ceiling(fa->clip->q.y)) /* Must be compatible to the clipping logic. */
58
0
        return 0;
59
0
    for (k = 0; k < n; k++) {
60
0
        curr[k] = c[k] = c0[k];
61
0
        f[k] = c0f[k];
62
0
    }
63
0
    for (i = i0 + 1, di = 1; i < i1; i += di) {
64
0
        if (di == 1) {
65
            /* Advance colors by 1 pixel. */
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0
            for (k = 0; k < n; k++) {
67
0
                if (cg_num[k]) {
68
0
                    int32_t m = f[k] + cg_num[k];
69
70
0
                    c[k] += m / cg_den;
71
0
                    m -= m / cg_den * cg_den;
72
0
                    if (m < 0) {
73
0
                        c[k]--;
74
0
                        m += cg_den;
75
0
                    }
76
0
                    f[k] = m;
77
0
                }
78
0
            }
79
0
        } else {
80
            /* Advance colors by di pixels. */
81
0
            for (k = 0; k < n; k++) {
82
0
                if (cg_num[k]) {
83
0
                    int64_t M = f[k] + (int64_t)cg_num[k] * di;
84
0
                    int32_t m;
85
86
0
                    c[k] += (frac31)(M / cg_den);
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0
                    m = (int32_t)(M - M / cg_den * cg_den);
88
0
                    if (m < 0) {
89
0
                        c[k]--;
90
0
                        m += cg_den;
91
0
                    }
92
0
                    f[k] = m;
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0
                }
94
0
            }
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0
        }
96
0
        if (gx_devn_diff(c, curr, n)) {
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0
            si = max(bi, fixed2int(fa->clip->p.x));     /* Must be compatible to the clipping logic. */
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0
            ei = min(i, fixed2int_ceiling(fa->clip->q.x));  /* Must be compatible to the clipping logic. */
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0
            if (si < ei) {
100
0
                if (fa->swap_axes) {
101
0
                    rect.p.x = int2fixed(j);
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0
                    rect.p.y = int2fixed(si);
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0
                    rect.q.x = int2fixed(j + 1);
104
0
                    rect.q.y = int2fixed(ei);
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0
                } else {
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0
                    rect.p.x = int2fixed(si);
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0
                    rect.p.y = int2fixed(j);
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0
                    rect.q.x = int2fixed(ei);
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0
                    rect.q.y = int2fixed(j + 1);
110
0
                }
111
0
                for (k = 0; k < n; k++) {
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0
                    devc.colors.devn.values[k] = frac312cv(curr[k]);
113
0
                }
114
0
                devc.tag = device_current_tag(dev);
115
0
                code = dev_proc(dev, fill_rectangle_hl_color) (dev, &rect, NULL, &devc, NULL);
116
0
                if (code < 0)
117
0
                    return code;
118
0
            }
119
0
            bi = i;
120
0
            for (k = 0; k < n; k++) {
121
0
                curr[k] = c[k];
122
0
            }
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0
            di = 1;
124
0
        } else if (i == i1) {
125
0
            i++;
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0
            break;
127
0
        } else {
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            /* Compute a color change pixel analytically. */
129
0
            di = i1 - i;
130
0
            for (k = 0; k < n; k++) {
131
0
                int32_t a;
132
0
                int64_t x;
133
0
                frac31 v = 1 << (31 - cinfo->comp_bits[k]); /* Color index precision in frac31. */
134
0
                frac31 u = c[k] & (v - 1);
135
136
0
                if (cg_num[k] == 0) {
137
                    /* No change. */
138
0
                    continue;
139
0
                } if (cg_num[k] > 0) {
140
                    /* Solve[(f[k] + cg_num[k]*x)/cg_den == v - u, x]  */
141
0
                    a = v - u;
142
0
                } else {
143
                    /* Solve[(f[k] + cg_num[k]*x)/cg_den == - u - 1, x]  */
144
0
                    a = -u - 1;
145
0
                }
146
0
                x = ((int64_t)a * cg_den - f[k]) / cg_num[k];
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0
                if (i + x >= i1)
148
0
                    continue;
149
0
                else if (x < 0)
150
0
                    return_error(gs_error_unregistered); /* Must not happen. */
151
0
                else if (di > (int)x) {
152
0
                    di = (int)x;
153
0
                    if (di <= 1) {
154
0
                        di = 1;
155
0
                        break;
156
0
                    }
157
0
                }
158
0
            }
159
0
        }
160
0
    }
161
0
    si = max(bi, fixed2int(fa->clip->p.x));     /* Must be compatible to the clipping logic. */
162
0
    ei = min(i, fixed2int_ceiling(fa->clip->q.x));  /* Must be compatible to the clipping logic. */
163
0
    if (si < ei) {
164
0
        if (fa->swap_axes) {
165
0
            rect.p.x = int2fixed(j);
166
0
            rect.p.y = int2fixed(si);
167
0
            rect.q.x = int2fixed(j + 1);
168
0
            rect.q.y = int2fixed(ei);
169
0
        } else {
170
0
            rect.p.x = int2fixed(si);
171
0
            rect.p.y = int2fixed(j);
172
0
            rect.q.x = int2fixed(ei);
173
0
            rect.q.y = int2fixed(j + 1);
174
0
        }
175
0
        for (k = 0; k < n; k++) {
176
0
            devc.colors.devn.values[k] = frac312cv(curr[k]);
177
0
        }
178
0
        devc.tag = device_current_tag(dev);
179
0
        return dev_proc(dev, fill_rectangle_hl_color) (dev, &rect, NULL, &devc, NULL);
180
0
    }
181
0
    return 0;
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0
}
183
184
int
185
gx_default_fill_linear_color_scanline(gx_device *dev, const gs_fill_attributes *fa,
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        int i0, int j, int w,
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        const frac31 *c0, const int32_t *c0f, const int32_t *cg_num, int32_t cg_den)
188
307k
{
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    /* This default implementation decomposes the area into constant color rectangles.
190
       Devices may supply optimized implementations with
191
       the inversed nesting of the i,k cicles,
192
       i.e. with enumerating planes first, with a direct writing to the raster,
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       and with a fixed bits per component.
194
     */
195
    /* First determine if we are doing high level style colors or pure colors */
196
307k
    bool devn = dev_proc(dev, dev_spec_op)(dev, gxdso_supports_devn, NULL, 0);
197
307k
    frac31 c[GX_DEVICE_COLOR_MAX_COMPONENTS];
198
307k
    ulong f[GX_DEVICE_COLOR_MAX_COMPONENTS];
199
307k
    int i, i1 = i0 + w, bi = i0, k;
200
307k
    gx_color_index ci0 = 0, ci1;
201
307k
    const gx_device_color_info *cinfo = &dev->color_info;
202
307k
    int n = cinfo->num_components;
203
307k
    int si, ei, di, code;
204
205
    /* Todo: set this up to vector earlier */
206
307k
    if (devn)  /* Note, PDF14 could be additive and doing devn */
207
0
        return gx_hl_fill_linear_color_scanline(dev, fa, i0, j, w, c0, c0f,
208
0
                                                cg_num, cg_den);
209
307k
    if (j < fixed2int(fa->clip->p.y) ||
210
307k
            j > fixed2int_ceiling(fa->clip->q.y)) /* Must be compatible to the clipping logic. */
211
0
        return 0;
212
820k
    for (k = 0; k < n; k++) {
213
513k
        int shift = cinfo->comp_shift[k];
214
513k
        int bits = cinfo->comp_bits[k];
215
216
513k
        c[k] = c0[k];
217
513k
        f[k] = c0f[k];
218
513k
        ci0 |= (gx_color_index)(c[k] >> (sizeof(c[k]) * 8 - 1 - bits)) << shift;
219
513k
    }
220
3.39M
    for (i = i0 + 1, di = 1; i < i1; i += di) {
221
3.09M
        if (di == 1) {
222
            /* Advance colors by 1 pixel. */
223
2.96M
            ci1 = 0;
224
7.12M
            for (k = 0; k < n; k++) {
225
4.15M
                int shift = cinfo->comp_shift[k];
226
4.15M
                int bits = cinfo->comp_bits[k];
227
228
4.15M
                if (cg_num[k]) {
229
2.96M
                    int32_t m = f[k] + cg_num[k];
230
231
2.96M
                    c[k] += m / cg_den;
232
2.96M
                    m -= m / cg_den * cg_den;
233
2.96M
                    if (m < 0) {
234
1.54M
                        c[k]--;
235
1.54M
                        m += cg_den;
236
1.54M
                    }
237
2.96M
                    f[k] = m;
238
2.96M
                }
239
4.15M
                ci1 |= (gx_color_index)(c[k] >> (sizeof(c[k]) * 8 - 1 - bits)) << shift;
240
4.15M
            }
241
2.96M
        } else {
242
            /* Advance colors by di pixels. */
243
126k
            ci1 = 0;
244
360k
            for (k = 0; k < n; k++) {
245
234k
                int shift = cinfo->comp_shift[k];
246
234k
                int bits = cinfo->comp_bits[k];
247
248
234k
                if (cg_num[k]) {
249
126k
                    int64_t M = f[k] + (int64_t)cg_num[k] * di;
250
126k
                    int32_t m;
251
252
126k
                    c[k] += (frac31)(M / cg_den);
253
126k
                    m = (int32_t)(M - M / cg_den * cg_den);
254
126k
                    if (m < 0) {
255
0
                        c[k]--;
256
0
                        m += cg_den;
257
0
                    }
258
126k
                    f[k] = m;
259
126k
                }
260
234k
                ci1 |= (gx_color_index)(c[k] >> (sizeof(c[k]) * 8 - 1 - bits)) << shift;
261
234k
            }
262
126k
        }
263
3.09M
        if (ci1 != ci0) {
264
921k
            si = max(bi, fixed2int(fa->clip->p.x));     /* Must be compatible to the clipping logic. */
265
921k
            ei = min(i, fixed2int_ceiling(fa->clip->q.x));  /* Must be compatible to the clipping logic. */
266
921k
            if (si < ei) {
267
921k
                if (fa->swap_axes) {
268
0
                    code = dev_proc(dev, fill_rectangle)(dev, j, si, 1, ei - si, ci0);
269
921k
                } else {
270
921k
                    code = dev_proc(dev, fill_rectangle)(dev, si, j, ei - si, 1, ci0);
271
921k
                }
272
921k
                if (code < 0)
273
0
                    return code;
274
921k
            }
275
921k
            bi = i;
276
921k
            ci0 = ci1;
277
921k
            di = 1;
278
2.16M
        } else if (i == i1) {
279
0
            i++;
280
0
            break;
281
2.16M
        } else {
282
            /* Compute a color change pixel analitically. */
283
2.16M
            di = i1 - i;
284
2.99M
            for (k = 0; k < n; k++) {
285
2.78M
                int32_t a;
286
2.78M
                int64_t x;
287
2.78M
                frac31 v = 1 << (31 - cinfo->comp_bits[k]); /* Color index precision in frac31. */
288
2.78M
                frac31 u = c[k] & (v - 1);
289
290
2.78M
                if (cg_num[k] == 0) {
291
                    /* No change. */
292
611k
                    continue;
293
2.16M
                } if (cg_num[k] > 0) {
294
                    /* Solve[(f[k] + cg_num[k]*x)/cg_den == v - u, x]  */
295
805k
                    a = v - u;
296
1.36M
                } else {
297
                    /* Solve[(f[k] + cg_num[k]*x)/cg_den == - u - 1, x]  */
298
1.36M
                    a = -u - 1;
299
1.36M
                }
300
2.16M
                x = ((int64_t)a * cg_den - f[k]) / cg_num[k];
301
2.16M
                if (i + x >= i1)
302
86.0k
                    continue;
303
2.08M
                else if (x < 0)
304
0
                    return_error(gs_error_unregistered); /* Must not happen. */
305
2.08M
                else if (di > (int)x) {
306
2.08M
                    di = (int)x;
307
2.08M
                    if (di <= 1) {
308
1.95M
                        di = 1;
309
1.95M
                        break;
310
1.95M
                    }
311
2.08M
                }
312
2.16M
            }
313
2.16M
        }
314
3.09M
    }
315
307k
    si = max(bi, fixed2int(fa->clip->p.x));     /* Must be compatible to the clipping logic. */
316
307k
    ei = min(i, fixed2int_ceiling(fa->clip->q.x));  /* Must be compatible to the clipping logic. */
317
307k
    if (si < ei) {
318
307k
        if (fa->swap_axes) {
319
39.5k
            return dev_proc(dev, fill_rectangle)(dev, j, si, 1, ei - si, ci0);
320
267k
        } else {
321
267k
            return dev_proc(dev, fill_rectangle)(dev, si, j, ei - si, 1, ci0);
322
267k
        }
323
307k
    }
324
770
    return 0;
325
307k
}