20609368106

Committed 31 Dec 2025 12:57AM UTC coverage: 52.011% (-6.3%) from 58.281%

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tests: split converter option tap suites

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0.0

/src/dither-positional-float32.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.
 */

#if defined(HAVE_CONFIG_H)
#include "config.h"
#endif

#if HAVE_MATH_H
# include <math.h>
#endif  /* HAVE_MATH_H */
#include <string.h>

#include "dither-positional-float32.h"
#include "dither-common-pipeline.h"
#include "pixelformat.h"
#include "lookup-common.h"

static void
sixel_dither_scanline_params_positional_float32(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
positional_mask_a_float32(int x, int y, int c)
{
    return ((((x + c * 67) + y * 236) * 119) & 255) / 128.0f - 1.0f;
}

static float
positional_mask_x_float32(int x, int y, int c)
{
    return ((((x + c * 29) ^ (y * 149)) * 1234) & 511) / 256.0f - 1.0f;
}

SIXELSTATUS
sixel_dither_apply_positional_float32(sixel_dither_t *dither,
                                      sixel_dither_context_t *context)
{
#if _MSC_VER
    enum { max_channels = 4 };
#else
    const int max_channels = 4;
#endif
    int serpentine;
    int y;
    int absolute_y;
    float (*f_mask)(int x, int y, int c);
    float jitter_scale;
    float *palette_float;
    float *new_palette_float;
    int float_depth;
    int float_index;
    unsigned char *quantized;
    float lookup_pixel_float[max_channels];
    unsigned char const *lookup_pixel;
    sixel_lut_t *fast_lut;
    int use_fast_lut;
    int lookup_wants_float;
    int use_palette_float_lookup;
    int need_float_pixel;

    palette_float = NULL;
    new_palette_float = NULL;
    float_depth = 0;
    quantized = NULL;
    lookup_wants_float = 0;

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

    switch (context->method_for_diffuse) {
    case SIXEL_DIFFUSE_A_DITHER:
        f_mask = positional_mask_a_float32;
        break;
    case SIXEL_DIFFUSE_X_DITHER:
    default:
        f_mask = positional_mask_x_float32;
        break;
    }

    serpentine = (context->method_for_scan == SIXEL_SCAN_SERPENTINE);
    jitter_scale = 32.0f / 255.0f;
    palette_float = context->palette_float;
    new_palette_float = context->new_palette_float;
    float_depth = context->float_depth;
    quantized = context->scratch;
    fast_lut = context->lut;
    use_fast_lut = (fast_lut != NULL);
    lookup_wants_float = (context->lookup_source_is_float != 0);
    use_palette_float_lookup = 0;
    if (context->prefer_palette_float_lookup != 0
            && palette_float != NULL
            && float_depth >= context->depth) {
        use_palette_float_lookup = 1;
    }
    need_float_pixel = lookup_wants_float || use_palette_float_lookup;

    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_positional_float32(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) {
                    float val;

                    val = context->pixels_float[pos * context->depth + d]
                        + f_mask(x, y, d) * jitter_scale;
                    val = sixel_pixelformat_float_channel_clamp(
                        context->pixelformat,
                        d,
                        val);
                    if (need_float_pixel) {
                        lookup_pixel_float[d] = val;
                    }
                    if (!lookup_wants_float && !use_palette_float_lookup) {
                        quantized[d]
                            = sixel_pixelformat_float_channel_to_byte(
                                  context->pixelformat,
                                  d,
                                  val);
                    }
                }
                if (lookup_wants_float) {
                    lookup_pixel = (unsigned char const *)(void const *)
                        lookup_pixel_float;
                    if (use_fast_lut) {
                        color_index = sixel_lut_map_pixel(fast_lut,
                                                         lookup_pixel);
                    } else {
                        color_index = context->lookup(lookup_pixel,
                                                      context->depth,
                                                      context->palette,
                                                      context->reqcolor,
                                                      context->indextable,
                                                      context->complexion);
                    }
                } else if (use_palette_float_lookup) {
                    color_index = sixel_dither_lookup_palette_float32(
                        lookup_pixel_float,
                        context->depth,
                        palette_float,
                        context->reqcolor,
                        context->complexion,
                        0);
                } else {
                    lookup_pixel = quantized;
                    if (use_fast_lut) {
                        color_index = sixel_lut_map_pixel(fast_lut,
                                                         lookup_pixel);
                    } else {
                        color_index = context->lookup(lookup_pixel,
                                                      context->depth,
                                                      context->palette,
                                                      context->reqcolor,
                                                      context->indextable,
                                                      context->complexion);
                    }
                }
                if (context->migration_map[color_index] == 0) {
                    if (absolute_y >= context->output_start) {
                        /*
                         * Palette indices never exceed SIXEL_PALETTE_MAX, so
                         * the cast to sixel_index_t (unsigned char) is safe.
                         */
                        context->result[pos]
                            = (sixel_index_t)(*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;
                    /*
                     * Migration map entries are limited to the palette size
                     * (<= 256), so storing them as unsigned short is safe.
                     */
                    context->migration_map[color_index]
                        = (unsigned short)(*context->ncolors);
                } else {
                    if (absolute_y >= context->output_start) {
                        context->result[pos]
                            = (sixel_index_t)(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_positional_float32(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) {
                    float val;

                    val = context->pixels_float[pos * context->depth + d]
                        + f_mask(x, y, d) * jitter_scale;
                    val = sixel_pixelformat_float_channel_clamp(
                        context->pixelformat,
                        d,
                        val);
                    if (need_float_pixel) {
                        lookup_pixel_float[d] = val;
                    }
                    if (!lookup_wants_float && !use_palette_float_lookup) {
                        quantized[d]
                            = sixel_pixelformat_float_channel_to_byte(
                                  context->pixelformat,
                                  d,
                                  val);
                    }
                }
                if (absolute_y >= context->output_start) {
                    /*
                     * Palette indices never exceed SIXEL_PALETTE_MAX, so
                     * narrowing to sixel_index_t (unsigned char) is safe.
                     */
                    if (lookup_wants_float) {
                        lookup_pixel = (unsigned char const *)(void const *)
                            lookup_pixel_float;
                        context->result[pos] = (sixel_index_t)
                            context->lookup(
                                lookup_pixel,
                                context->depth,
                                context->palette,
                                context->reqcolor,
                                context->indextable,
                                context->complexion);
                    } else if (use_palette_float_lookup) {
                        context->result[pos] = (sixel_index_t)
                            sixel_dither_lookup_palette_float32(
                                lookup_pixel_float,
                                context->depth,
                                palette_float,
                                context->reqcolor,
                                context->complexion,
                                0);
                    } else {
                        lookup_pixel = quantized;
                        context->result[pos] = (sixel_index_t)
                            context->lookup(
                                lookup_pixel,
                                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;
}

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/* 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	#if defined(HAVE_CONFIG_H)
26	#include "config.h"
27	#endif
28
29	#if HAVE_MATH_H
30	# include <math.h>
31	#endif /* HAVE_MATH_H */
32	#include <string.h>
33
34	#include "dither-positional-float32.h"
35	#include "dither-common-pipeline.h"
36	#include "pixelformat.h"
37	#include "lookup-common.h"
38
39	static void
40	sixel_dither_scanline_params_positional_float32(int serpentine,	×
41	int index,
42	int limit,
43	int *start,
44	int *end,
45	int *step,
46	int *direction)
47	{
48	if (serpentine && (index & 1)) {	×
49	*start = limit - 1;	×
50	*end = -1;	×
51	*step = -1;	×
52	*direction = -1;	×
53	} else {
54	*start = 0;
55	*end = limit;
56	*step = 1;
57	*direction = 1;	×
58	}
59	}
60
61	static float
62	positional_mask_a_float32(int x, int y, int c)	×
63	{
64	return ((((x + c * 67) + y * 236) * 119) & 255) / 128.0f - 1.0f;	×
65	}
66
67	static float
68	positional_mask_x_float32(int x, int y, int c)	×
69	{
70	return ((((x + c * 29) ^ (y * 149)) * 1234) & 511) / 256.0f - 1.0f;	×
71	}
72
73	SIXELSTATUS
74	sixel_dither_apply_positional_float32(sixel_dither_t *dither,	×
75	sixel_dither_context_t *context)
76	{	×
77	#if _MSC_VER
78	enum { max_channels = 4 };
79	#else
80	const int max_channels = 4;	×
81	#endif
82	int serpentine;	×
83	int y;	×
84	int absolute_y;	×
85	float (*f_mask)(int x, int y, int c);	×
86	float jitter_scale;	×
87	float *palette_float;	×
88	float *new_palette_float;	×
89	int float_depth;	×
90	int float_index;	×
91	unsigned char *quantized;	×
92	float lookup_pixel_float[max_channels];	×
93	unsigned char const *lookup_pixel;	×
94	sixel_lut_t *fast_lut;	×
95	int use_fast_lut;	×
96	int lookup_wants_float;	×
97	int use_palette_float_lookup;	×
98	int need_float_pixel;	×
99
100	palette_float = NULL;	×
101	new_palette_float = NULL;	×
102	float_depth = 0;	×
103	quantized = NULL;	×
104	lookup_wants_float = 0;	×
105
106	if (dither == NULL \|\| context == NULL) {	×
107	return SIXEL_BAD_ARGUMENT;
108	}
109	if (context->pixels_float == NULL \|\| context->scratch == NULL) {	×
110	return SIXEL_BAD_ARGUMENT;
111	}
112	if (context->palette == NULL \|\| context->result == NULL) {	×
113	return SIXEL_BAD_ARGUMENT;
114	}
115
116	switch (context->method_for_diffuse) {	×
117	case SIXEL_DIFFUSE_A_DITHER:
118	f_mask = positional_mask_a_float32;
119	break;
120	case SIXEL_DIFFUSE_X_DITHER:	×
121	default:
122	f_mask = positional_mask_x_float32;	×
123	break;	×
124	}
125
126	serpentine = (context->method_for_scan == SIXEL_SCAN_SERPENTINE);	×
127	jitter_scale = 32.0f / 255.0f;	×
128	palette_float = context->palette_float;	×
129	new_palette_float = context->new_palette_float;	×
130	float_depth = context->float_depth;	×
131	quantized = context->scratch;	×
132	fast_lut = context->lut;	×
133	use_fast_lut = (fast_lut != NULL);	×
134	lookup_wants_float = (context->lookup_source_is_float != 0);	×
135	use_palette_float_lookup = 0;	×
136	if (context->prefer_palette_float_lookup != 0	×
137	&& palette_float != NULL	×
138	&& float_depth >= context->depth) {	×
139	use_palette_float_lookup = 1;	×
140	}
141	need_float_pixel = lookup_wants_float \|\| use_palette_float_lookup;	×
142
143	if (context->optimize_palette) {	×
144	int x;	×
145
146	*context->ncolors = 0;	×
147	memset(context->new_palette, 0x00,	×
148	(size_t)SIXEL_PALETTE_MAX * (size_t)context->depth);	×
149	if (new_palette_float != NULL && float_depth > 0) {	×
150	memset(new_palette_float, 0x00,	×
151	(size_t)SIXEL_PALETTE_MAX
152	* (size_t)float_depth * sizeof(float));	×
153	}
154	memset(context->migration_map, 0x00,	×
155	sizeof(unsigned short) * (size_t)SIXEL_PALETTE_MAX);
156	for (y = 0; y < context->height; ++y) {	×
157	absolute_y = context->band_origin + y;	×
158	int start;	×
159	int end;	×
160	int step;	×
161	int direction;	×
162
163	sixel_dither_scanline_params_positional_float32(serpentine, absolute_y,	×
164	context->width,
165	&start, &end, &step, &direction);
166	(void)direction;	×
167	for (x = start; x != end; x += step) {	×
168	int pos;	×
169	int d;	×
170	int color_index;	×
171
172	pos = y * context->width + x;	×
173	for (d = 0; d < context->depth; ++d) {	×
174	float val;	×
175
176	val = context->pixels_float[pos * context->depth + d]	×
177	+ f_mask(x, y, d) * jitter_scale;	×
178	val = sixel_pixelformat_float_channel_clamp(	×
179	context->pixelformat,
180	d,
181	val);
182	if (need_float_pixel) {	×
183	lookup_pixel_float[d] = val;	×
184	}
185	if (!lookup_wants_float && !use_palette_float_lookup) {	×
186	quantized[d]	×
187	= sixel_pixelformat_float_channel_to_byte(	×
188	context->pixelformat,
189	d,
190	val);
191	}
192	}
193	if (lookup_wants_float) {	×
194	lookup_pixel = (unsigned char const )(void const )	×
195	lookup_pixel_float;
196	if (use_fast_lut) {	×
197	color_index = sixel_lut_map_pixel(fast_lut,	×
198	lookup_pixel);
199	} else {
200	color_index = context->lookup(lookup_pixel,	×
201	context->depth,
202	context->palette,	×
203	context->reqcolor,
204	context->indextable,
205	context->complexion);
206	}
207	} else if (use_palette_float_lookup) {	×
208	color_index = sixel_dither_lookup_palette_float32(	×
209	lookup_pixel_float,
210	context->depth,
211	palette_float,
212	context->reqcolor,
213	context->complexion,
214	0);
215	} else {
216	lookup_pixel = quantized;	×
217	if (use_fast_lut) {	×
218	color_index = sixel_lut_map_pixel(fast_lut,	×
219	lookup_pixel);
220	} else {
221	color_index = context->lookup(lookup_pixel,	×
222	context->depth,
223	context->palette,	×
224	context->reqcolor,
225	context->indextable,
226	context->complexion);
227	}
228	}
229	if (context->migration_map[color_index] == 0) {	×
230	if (absolute_y >= context->output_start) {	×
231	/*
232	* Palette indices never exceed SIXEL_PALETTE_MAX, so
233	* the cast to sixel_index_t (unsigned char) is safe.
234	*/
235	context->result[pos]	×
236	= (sixel_index_t)(*context->ncolors);	×
237	}
238	for (d = 0; d < context->depth; ++d) {	×
239	context->new_palette[*context->ncolors	×
240	* context->depth + d]	×
241	= context->palette[color_index	×
242	* context->depth + d];	×
243	}
244	if (palette_float != NULL	×
245	&& new_palette_float != NULL	×
246	&& float_depth > 0) {	×
247	for (float_index = 0;	×
248	float_index < float_depth;	×
249	++float_index) {	×
250	new_palette_float[*context->ncolors	×
251	* float_depth	×
252	+ float_index]	×
253	= palette_float[color_index * float_depth	×
254	+ float_index];	×
255	}
256	}
257	++*context->ncolors;	×
258	/*
259	* Migration map entries are limited to the palette size
260	* (<= 256), so storing them as unsigned short is safe.
261	*/
262	context->migration_map[color_index]	×
263	= (unsigned short)(*context->ncolors);	×
264	} else {
265	if (absolute_y >= context->output_start) {	×
266	context->result[pos]	×
267	= (sixel_index_t)(context->migration_map[	×
268	color_index] - 1);
269	}
270	}
271	}
272	if (absolute_y >= context->output_start) {	×
273	sixel_dither_pipeline_row_notify(dither, absolute_y);	×
274	}
275	}
276	memcpy(context->palette, context->new_palette,	×
277	(size_t)(context->ncolors context->depth));	×
278	if (palette_float != NULL	×
279	&& new_palette_float != NULL	×
280	&& float_depth > 0) {	×
281	memcpy(palette_float,	×
282	new_palette_float,
283	(size_t)(context->ncolors float_depth)	×
284	* sizeof(float));
285	}
286	} else {
287	int x;
288
289	for (y = 0; y < context->height; ++y) {	×
290	absolute_y = context->band_origin + y;	×
291	int start;	×
292	int end;	×
293	int step;	×
294	int direction;	×
295
296	sixel_dither_scanline_params_positional_float32(serpentine, absolute_y,	×
297	context->width,
298	&start, &end, &step, &direction);
299	(void)direction;	×
300	for (x = start; x != end; x += step) {	×
301	int pos;	×
302	int d;	×
303
304	pos = y * context->width + x;	×
305	for (d = 0; d < context->depth; ++d) {	×
306	float val;	×
307
308	val = context->pixels_float[pos * context->depth + d]	×
309	+ f_mask(x, y, d) * jitter_scale;	×
310	val = sixel_pixelformat_float_channel_clamp(	×
311	context->pixelformat,
312	d,
313	val);
314	if (need_float_pixel) {	×
315	lookup_pixel_float[d] = val;	×
316	}
317	if (!lookup_wants_float && !use_palette_float_lookup) {	×
318	quantized[d]	×
319	= sixel_pixelformat_float_channel_to_byte(	×
320	context->pixelformat,
321	d,
322	val);
323	}
324	}
325	if (absolute_y >= context->output_start) {	×
326	/*
327	* Palette indices never exceed SIXEL_PALETTE_MAX, so
328	* narrowing to sixel_index_t (unsigned char) is safe.
329	*/
330	if (lookup_wants_float) {	×
331	lookup_pixel = (unsigned char const )(void const )	×
332	lookup_pixel_float;
333	context->result[pos] = (sixel_index_t)	×
334	context->lookup(	×
335	lookup_pixel,
336	context->depth,
337	context->palette,	×
338	context->reqcolor,
339	context->indextable,
340	context->complexion);
341	} else if (use_palette_float_lookup) {	×
342	context->result[pos] = (sixel_index_t)	×
343	sixel_dither_lookup_palette_float32(	×
344	lookup_pixel_float,
345	context->depth,
346	palette_float,
347	context->reqcolor,
348	context->complexion,
349	0);
350	} else {
351	lookup_pixel = quantized;	×
352	context->result[pos] = (sixel_index_t)	×
353	context->lookup(	×
354	lookup_pixel,
355	context->depth,
356	context->palette,	×
357	context->reqcolor,
358	context->indextable,
359	context->complexion);
360	}
361	}
362	}
363	if (absolute_y >= context->output_start) {	×
364	sixel_dither_pipeline_row_notify(dither, absolute_y);	×
365	}
366	}
367	*context->ncolors = context->reqcolor;	×
368	}
369
370	return SIXEL_OK;
371	}
372
373	/* emacs Local Variables: */
374	/* emacs mode: c */
375	/* emacs tab-width: 4 */
376	/* emacs indent-tabs-mode: nil */
377	/* emacs c-basic-offset: 4 */
378	/* emacs End: */
379	/* vim: set expandtab ts=4 sts=4 sw=4 : */
380	/* EOF */

saitoha / libsixel / 20609368106

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