19765269522

Committed 28 Nov 2025 01:30PM UTC coverage: 39.983% (-1.6%) from 41.616%

Build # 19765269522

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web-flow

Commit Message

Merge pull request #214 from saitoha/codex/add-logging-to-resize-processing

Limit scale logging and add timeline window controls

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0.0

/src/dither-positional-8bit.c

/*
 * SPDX-License-Identifier: MIT
 *
 * Copyright (c) 2025 libsixel developers. See `AUTHORS`.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "config.h"

#include <string.h>

#include "dither-positional-8bit.h"
#include "dither-common-pipeline.h"
#include "lookup-common.h"

static void
sixel_dither_scanline_params(int serpentine,
                             int index,
                             int limit,
                             int *start,
                             int *end,
                             int *step,
                             int *direction)
{
    if (serpentine && (index & 1)) {
        *start = limit - 1;
        *end = -1;
        *step = -1;
        *direction = -1;
    } else {
        *start = 0;
        *end = limit;
        *step = 1;
        *direction = 1;
    }
}

static float mask_a(int x, int y, int c);
static float mask_x(int x, int y, int c);

static float
mask_a(int x, int y, int c)
{
    return ((((x + c * 67) + y * 236) * 119) & 255) / 128.0f - 1.0f;
}

static float
mask_x(int x, int y, int c)
{
    return ((((x + c * 29) ^ (y * 149)) * 1234) & 511) / 256.0f - 1.0f;
}

SIXELSTATUS
sixel_dither_apply_positional_8bit(sixel_dither_t *dither,
                                   sixel_dither_context_t *context)
{
    int serpentine;
    int y;
    int absolute_y;
    float *palette_float;
    float *new_palette_float;
    int float_depth;
    int float_index;
    sixel_lut_t *fast_lut;
    int use_fast_lut;
    float (*f_mask)(int x, int y, int c);

    palette_float = NULL;
    new_palette_float = NULL;
    float_depth = 0;

    if (dither == NULL || context == NULL) {
        return SIXEL_BAD_ARGUMENT;
    }
    if (context->pixels == NULL || context->palette == NULL) {
        return SIXEL_BAD_ARGUMENT;
    }
    if (context->result == NULL || context->scratch == NULL) {
        return SIXEL_BAD_ARGUMENT;
    }

    switch (context->method_for_diffuse) {
    case SIXEL_DIFFUSE_A_DITHER:
        f_mask = mask_a;
        break;
    case SIXEL_DIFFUSE_X_DITHER:
    default:
        f_mask = mask_x;
        break;
    }

    serpentine = (context->method_for_scan == SIXEL_SCAN_SERPENTINE);
    palette_float = context->palette_float;
    new_palette_float = context->new_palette_float;
    float_depth = context->float_depth;
    fast_lut = context->lut;
    use_fast_lut = (fast_lut != NULL);

    if (context->optimize_palette) {
        int x;

        *context->ncolors = 0;
        memset(context->new_palette, 0x00,
               (size_t)SIXEL_PALETTE_MAX * (size_t)context->depth);
        if (new_palette_float != NULL && float_depth > 0) {
            memset(new_palette_float, 0x00,
                   (size_t)SIXEL_PALETTE_MAX
                       * (size_t)float_depth * sizeof(float));
        }
        memset(context->migration_map, 0x00,
               sizeof(unsigned short) * (size_t)SIXEL_PALETTE_MAX);
        for (y = 0; y < context->height; ++y) {
            absolute_y = context->band_origin + y;
            int start;
            int end;
            int step;
            int direction;

            sixel_dither_scanline_params(serpentine, absolute_y,
                                         context->width,
                                         &start, &end, &step, &direction);
            (void)direction;
            for (x = start; x != end; x += step) {
                int pos;
                int d;
                int color_index;

                pos = y * context->width + x;
                for (d = 0; d < context->depth; ++d) {
                    int val;

                    val = context->pixels[pos * context->depth + d]
                        + (int)(f_mask(x, y, d) * 32.0f);
                    context->scratch[d] = val < 0 ? 0
                                       : val > 255 ? 255 : val;
                }
                if (use_fast_lut) {
                    color_index = sixel_lut_map_pixel(fast_lut,
                                                     context->scratch);
                } else {
                    color_index = context->lookup(context->scratch,
                                                  context->depth,
                                                  context->palette,
                                                  context->reqcolor,
                                                  context->indextable,
                                                  context->complexion);
                }
                if (context->migration_map[color_index] == 0) {
                    if (absolute_y >= context->output_start) {
                        context->result[pos] = *context->ncolors;
                    }
                    for (d = 0; d < context->depth; ++d) {
                        context->new_palette[*context->ncolors
                                             * context->depth + d]
                            = context->palette[color_index
                                               * context->depth + d];
                    }
                    if (palette_float != NULL
                            && new_palette_float != NULL
                            && float_depth > 0) {
                        for (float_index = 0;
                                float_index < float_depth;
                                ++float_index) {
                            new_palette_float[*context->ncolors
                                               * float_depth
                                               + float_index]
                                = palette_float[color_index * float_depth
                                                + float_index];
                        }
                    }
                    ++*context->ncolors;
                    context->migration_map[color_index] = *context->ncolors;
                } else {
                    if (absolute_y >= context->output_start) {
                        context->result[pos] =
                            context->migration_map[color_index] - 1;
                    }
                }
            }
            if (absolute_y >= context->output_start) {
                sixel_dither_pipeline_row_notify(dither, absolute_y);
            }
        }
        memcpy(context->palette, context->new_palette,
               (size_t)(*context->ncolors * context->depth));
        if (palette_float != NULL
                && new_palette_float != NULL
                && float_depth > 0) {
            memcpy(palette_float,
                   new_palette_float,
                   (size_t)(*context->ncolors * float_depth)
                       * sizeof(float));
        }
    } else {
        int x;

        for (y = 0; y < context->height; ++y) {
            absolute_y = context->band_origin + y;
            int start;
            int end;
            int step;
            int direction;

            sixel_dither_scanline_params(serpentine, absolute_y,
                                         context->width,
                                         &start, &end, &step, &direction);
            (void)direction;
            for (x = start; x != end; x += step) {
                int pos;
                int d;

                pos = y * context->width + x;
                for (d = 0; d < context->depth; ++d) {
                    int val;

                    val = context->pixels[pos * context->depth + d]
                        + (int)(f_mask(x, y, d) * 32.0f);
                    context->scratch[d] = val < 0 ? 0
                                       : val > 255 ? 255 : val;
                }
                if (absolute_y >= context->output_start) {
                    context->result[pos] =
                        context->lookup(context->scratch,
                                        context->depth,
                                        context->palette,
                                        context->reqcolor,
                                        context->indextable,
                                        context->complexion);
                }
            }
            if (absolute_y >= context->output_start) {
                sixel_dither_pipeline_row_notify(dither, absolute_y);
            }
        }
        *context->ncolors = context->reqcolor;
    }

    return SIXEL_OK;
}

/* emacs Local Variables:      */
/* emacs mode: c               */
/* emacs tab-width: 4          */
/* emacs indent-tabs-mode: nil */
/* emacs c-basic-offset: 4     */
/* emacs End:                  */
/* vim: set expandtab ts=4 sts=4 sw=4 : */
/* EOF */

1	/*
2	* SPDX-License-Identifier: MIT
3	*
4	* Copyright (c) 2025 libsixel developers. See `AUTHORS`.
5	*
6	* Permission is hereby granted, free of charge, to any person obtaining a copy
7	* of this software and associated documentation files (the "Software"), to deal
8	* in the Software without restriction, including without limitation the rights
9	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10	* copies of the Software, and to permit persons to whom the Software is
11	* furnished to do so, subject to the following conditions:
12	*
13	* The above copyright notice and this permission notice shall be included in
14	* all copies or substantial portions of the Software.
15	*
16	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22	* SOFTWARE.
23	*/
24
25	#include "config.h"
26
27	#include <string.h>
28
29	#include "dither-positional-8bit.h"
30	#include "dither-common-pipeline.h"
31	#include "lookup-common.h"
32
33	static void
34	sixel_dither_scanline_params(int serpentine,	×
35	int index,
36	int limit,
37	int *start,
38	int *end,
39	int *step,
40	int *direction)
41	{
42	if (serpentine && (index & 1)) {	×
43	*start = limit - 1;	×
44	*end = -1;	×
45	*step = -1;	×
46	*direction = -1;	×
47	} else {
48	*start = 0;	×
49	*end = limit;	×
50	*step = 1;	×
51	*direction = 1;	×
52	}
53	}	×
54
55	static float mask_a(int x, int y, int c);
56	static float mask_x(int x, int y, int c);
57
58	static float
59	mask_a(int x, int y, int c)	×
60	{
61	return ((((x + c * 67) + y * 236) * 119) & 255) / 128.0f - 1.0f;	×
62	}
63
64	static float
65	mask_x(int x, int y, int c)	×
66	{
67	return ((((x + c * 29) ^ (y * 149)) * 1234) & 511) / 256.0f - 1.0f;	×
68	}
69
70	SIXELSTATUS
71	sixel_dither_apply_positional_8bit(sixel_dither_t *dither,	×
72	sixel_dither_context_t *context)
73	{
74	int serpentine;
75	int y;
76	int absolute_y;
77	float *palette_float;
78	float *new_palette_float;
79	int float_depth;
80	int float_index;
81	sixel_lut_t *fast_lut;
82	int use_fast_lut;
83	float (*f_mask)(int x, int y, int c);
84
85	palette_float = NULL;	×
86	new_palette_float = NULL;	×
87	float_depth = 0;	×
88
89	if (dither == NULL \|\| context == NULL) {	×
90	return SIXEL_BAD_ARGUMENT;	×
91	}
92	if (context->pixels == NULL \|\| context->palette == NULL) {	×
93	return SIXEL_BAD_ARGUMENT;	×
94	}
95	if (context->result == NULL \|\| context->scratch == NULL) {	×
96	return SIXEL_BAD_ARGUMENT;	×
97	}
98
99	switch (context->method_for_diffuse) {	×
UNCOV 100	case SIXEL_DIFFUSE_A_DITHER:	×
101	f_mask = mask_a;	×
102	break;	×
103	case SIXEL_DIFFUSE_X_DITHER:	×
104	default:
105	f_mask = mask_x;	×
106	break;	×
107	}
108
109	serpentine = (context->method_for_scan == SIXEL_SCAN_SERPENTINE);	×
110	palette_float = context->palette_float;	×
111	new_palette_float = context->new_palette_float;	×
112	float_depth = context->float_depth;	×
113	fast_lut = context->lut;	×
114	use_fast_lut = (fast_lut != NULL);	×
115
116	if (context->optimize_palette) {	×
117	int x;
118
119	*context->ncolors = 0;	×
120	memset(context->new_palette, 0x00,	×
UNCOV 121	(size_t)SIXEL_PALETTE_MAX * (size_t)context->depth);	×
122	if (new_palette_float != NULL && float_depth > 0) {	×
123	memset(new_palette_float, 0x00,	×
124	(size_t)SIXEL_PALETTE_MAX
UNCOV 125	* (size_t)float_depth * sizeof(float));	×
126	}
127	memset(context->migration_map, 0x00,	×
128	sizeof(unsigned short) * (size_t)SIXEL_PALETTE_MAX);
129	for (y = 0; y < context->height; ++y) {	×
130	absolute_y = context->band_origin + y;	×
131	int start;
132	int end;
133	int step;
134	int direction;
135
136	sixel_dither_scanline_params(serpentine, absolute_y,	×
137	context->width,
138	&start, &end, &step, &direction);
139	(void)direction;
140	for (x = start; x != end; x += step) {	×
141	int pos;
142	int d;
143	int color_index;
144
145	pos = y * context->width + x;	×
146	for (d = 0; d < context->depth; ++d) {	×
147	int val;
148
149	val = context->pixels[pos * context->depth + d]	×
150	+ (int)(f_mask(x, y, d) * 32.0f);	×
151	context->scratch[d] = val < 0 ? 0	×
152	: val > 255 ? 255 : val;	×
153	}
154	if (use_fast_lut) {	×
155	color_index = sixel_lut_map_pixel(fast_lut,	×
156	context->scratch);	×
157	} else {
158	color_index = context->lookup(context->scratch,	×
159	context->depth,
160	context->palette,	×
161	context->reqcolor,
162	context->indextable,
163	context->complexion);
164	}
165	if (context->migration_map[color_index] == 0) {	×
166	if (absolute_y >= context->output_start) {	×
167	context->result[pos] = *context->ncolors;	×
168	}
169	for (d = 0; d < context->depth; ++d) {	×
170	context->new_palette[*context->ncolors	×
171	* context->depth + d]	×
172	= context->palette[color_index	×
173	* context->depth + d];	×
174	}
175	if (palette_float != NULL	×
176	&& new_palette_float != NULL	×
177	&& float_depth > 0) {	×
178	for (float_index = 0;	×
179	float_index < float_depth;	×
180	++float_index) {	×
181	new_palette_float[*context->ncolors	×
182	* float_depth	×
183	+ float_index]	×
184	= palette_float[color_index * float_depth	×
185	+ float_index];	×
186	}
187	}
188	++*context->ncolors;	×
189	context->migration_map[color_index] = *context->ncolors;	×
190	} else {
191	if (absolute_y >= context->output_start) {	×
192	context->result[pos] =	×
193	context->migration_map[color_index] - 1;	×
194	}
195	}
196	}
197	if (absolute_y >= context->output_start) {	×
198	sixel_dither_pipeline_row_notify(dither, absolute_y);	×
199	}
200	}
201	memcpy(context->palette, context->new_palette,	×
UNCOV 202	(size_t)(context->ncolors context->depth));	×
203	if (palette_float != NULL	×
204	&& new_palette_float != NULL	×
205	&& float_depth > 0) {	×
206	memcpy(palette_float,	×
207	new_palette_float,
UNCOV 208	(size_t)(context->ncolors float_depth)	×
209	* sizeof(float));
210	}
211	} else {
212	int x;
213
214	for (y = 0; y < context->height; ++y) {	×
215	absolute_y = context->band_origin + y;	×
216	int start;
217	int end;
218	int step;
219	int direction;
220
221	sixel_dither_scanline_params(serpentine, absolute_y,	×
222	context->width,
223	&start, &end, &step, &direction);
224	(void)direction;
225	for (x = start; x != end; x += step) {	×
226	int pos;
227	int d;
228
229	pos = y * context->width + x;	×
230	for (d = 0; d < context->depth; ++d) {	×
231	int val;
232
233	val = context->pixels[pos * context->depth + d]	×
234	+ (int)(f_mask(x, y, d) * 32.0f);	×
235	context->scratch[d] = val < 0 ? 0	×
236	: val > 255 ? 255 : val;	×
237	}
238	if (absolute_y >= context->output_start) {	×
239	context->result[pos] =	×
240	context->lookup(context->scratch,	×
241	context->depth,
242	context->palette,	×
243	context->reqcolor,
244	context->indextable,
245	context->complexion);
246	}
247	}
248	if (absolute_y >= context->output_start) {	×
249	sixel_dither_pipeline_row_notify(dither, absolute_y);	×
250	}
251	}
252	*context->ncolors = context->reqcolor;	×
253	}
254
255	return SIXEL_OK;	×
256	}
257
258	/* emacs Local Variables: */
259	/* emacs mode: c */
260	/* emacs tab-width: 4 */
261	/* emacs indent-tabs-mode: nil */
262	/* emacs c-basic-offset: 4 */
263	/* emacs End: */
264	/* vim: set expandtab ts=4 sts=4 sw=4 : */
265	/* EOF */

saitoha / libsixel / 19765269522

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