Line data Source code
1 : /*
2 : * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
3 : *
4 : * Use of this source code is governed by a BSD-style license
5 : * that can be found in the LICENSE file in the root of the source
6 : * tree. An additional intellectual property rights grant can be found
7 : * in the file PATENTS. All contributing project authors may
8 : * be found in the AUTHORS file in the root of the source tree.
9 : */
10 :
11 : /****************************************************************************
12 : *
13 : * Module Title : scale.c
14 : *
15 : * Description : Image scaling functions.
16 : *
17 : ***************************************************************************/
18 :
19 : /****************************************************************************
20 : * Header Files
21 : ****************************************************************************/
22 : #include "./vpx_scale_rtcd.h"
23 : #include "vpx_mem/vpx_mem.h"
24 : #include "vpx_scale/vpx_scale.h"
25 : #include "vpx_scale/yv12config.h"
26 :
27 : typedef struct {
28 : int expanded_frame_width;
29 : int expanded_frame_height;
30 :
31 : int HScale;
32 : int HRatio;
33 : int VScale;
34 : int VRatio;
35 :
36 : YV12_BUFFER_CONFIG *src_yuv_config;
37 : YV12_BUFFER_CONFIG *dst_yuv_config;
38 :
39 : } SCALE_VARS;
40 :
41 : /****************************************************************************
42 : *
43 : * ROUTINE : scale1d_2t1_i
44 : *
45 : * INPUTS : const unsigned char *source : Pointer to data to be scaled.
46 : * int source_step : Number of pixels to step on in
47 : * source.
48 : * unsigned int source_scale : Scale for source (UNUSED).
49 : * unsigned int source_length : Length of source (UNUSED).
50 : * unsigned char *dest : Pointer to output data array.
51 : * int dest_step : Number of pixels to step on in
52 : * destination.
53 : * unsigned int dest_scale : Scale for destination
54 : * (UNUSED).
55 : * unsigned int dest_length : Length of destination.
56 : *
57 : * OUTPUTS : None.
58 : *
59 : * RETURNS : void
60 : *
61 : * FUNCTION : Performs 2-to-1 interpolated scaling.
62 : *
63 : * SPECIAL NOTES : None.
64 : *
65 : ****************************************************************************/
66 0 : static void scale1d_2t1_i(const unsigned char *source, int source_step,
67 : unsigned int source_scale, unsigned int source_length,
68 : unsigned char *dest, int dest_step,
69 : unsigned int dest_scale, unsigned int dest_length) {
70 : unsigned int i, j;
71 : unsigned int temp;
72 0 : int source_pitch = source_step;
73 : (void)source_length;
74 : (void)source_scale;
75 : (void)dest_scale;
76 :
77 0 : source_step *= 2;
78 0 : dest[0] = source[0];
79 :
80 0 : for (i = dest_step, j = source_step; i < dest_length * dest_step;
81 0 : i += dest_step, j += source_step) {
82 0 : temp = 8;
83 0 : temp += 3 * source[j - source_pitch];
84 0 : temp += 10 * source[j];
85 0 : temp += 3 * source[j + source_pitch];
86 0 : temp >>= 4;
87 0 : dest[i] = (char)(temp);
88 : }
89 0 : }
90 :
91 : /****************************************************************************
92 : *
93 : * ROUTINE : scale1d_2t1_ps
94 : *
95 : * INPUTS : const unsigned char *source : Pointer to data to be scaled.
96 : * int source_step : Number of pixels to step on in
97 : * source.
98 : * unsigned int source_scale : Scale for source (UNUSED).
99 : * unsigned int source_length : Length of source (UNUSED).
100 : * unsigned char *dest : Pointer to output data array.
101 : * int dest_step : Number of pixels to step on in
102 : * destination.
103 : * unsigned int dest_scale : Scale for destination
104 : * (UNUSED).
105 : * unsigned int dest_length : Length of destination.
106 : *
107 : * OUTPUTS : None.
108 : *
109 : * RETURNS : void
110 : *
111 : * FUNCTION : Performs 2-to-1 point subsampled scaling.
112 : *
113 : * SPECIAL NOTES : None.
114 : *
115 : ****************************************************************************/
116 0 : static void scale1d_2t1_ps(const unsigned char *source, int source_step,
117 : unsigned int source_scale,
118 : unsigned int source_length, unsigned char *dest,
119 : int dest_step, unsigned int dest_scale,
120 : unsigned int dest_length) {
121 : unsigned int i, j;
122 :
123 : (void)source_length;
124 : (void)source_scale;
125 : (void)dest_scale;
126 :
127 0 : source_step *= 2;
128 0 : j = 0;
129 :
130 0 : for (i = 0; i < dest_length * dest_step; i += dest_step, j += source_step)
131 0 : dest[i] = source[j];
132 0 : }
133 : /****************************************************************************
134 : *
135 : * ROUTINE : scale1d_c
136 : *
137 : * INPUTS : const unsigned char *source : Pointer to data to be scaled.
138 : * int source_step : Number of pixels to step on in
139 : * source.
140 : * unsigned int source_scale : Scale for source.
141 : * unsigned int source_length : Length of source (UNUSED).
142 : * unsigned char *dest : Pointer to output data array.
143 : * int dest_step : Number of pixels to step on in
144 : * destination.
145 : * unsigned int dest_scale : Scale for destination.
146 : * unsigned int dest_length : Length of destination.
147 : *
148 : * OUTPUTS : None.
149 : *
150 : * RETURNS : void
151 : *
152 : * FUNCTION : Performs linear interpolation in one dimension.
153 : *
154 : * SPECIAL NOTES : None.
155 : *
156 : ****************************************************************************/
157 0 : static void scale1d_c(const unsigned char *source, int source_step,
158 : unsigned int source_scale, unsigned int source_length,
159 : unsigned char *dest, int dest_step,
160 : unsigned int dest_scale, unsigned int dest_length) {
161 : unsigned int i;
162 0 : unsigned int round_value = dest_scale / 2;
163 0 : unsigned int left_modifier = dest_scale;
164 0 : unsigned int right_modifier = 0;
165 0 : unsigned char left_pixel = *source;
166 0 : unsigned char right_pixel = *(source + source_step);
167 :
168 : (void)source_length;
169 :
170 : /* These asserts are needed if there are boundary issues... */
171 : /*assert ( dest_scale > source_scale );*/
172 : /*assert ( (source_length-1) * dest_scale >= (dest_length-1) * source_scale
173 : * );*/
174 :
175 0 : for (i = 0; i < dest_length * dest_step; i += dest_step) {
176 0 : dest[i] = (char)((left_modifier * left_pixel +
177 0 : right_modifier * right_pixel + round_value) /
178 : dest_scale);
179 :
180 0 : right_modifier += source_scale;
181 :
182 0 : while (right_modifier > dest_scale) {
183 0 : right_modifier -= dest_scale;
184 0 : source += source_step;
185 0 : left_pixel = *source;
186 0 : right_pixel = *(source + source_step);
187 : }
188 :
189 0 : left_modifier = dest_scale - right_modifier;
190 : }
191 0 : }
192 :
193 : /****************************************************************************
194 : *
195 : * ROUTINE : Scale2D
196 : *
197 : * INPUTS : const unsigned char *source : Pointer to data to be
198 : * scaled.
199 : * int source_pitch : Stride of source image.
200 : * unsigned int source_width : Width of input image.
201 : * unsigned int source_height : Height of input image.
202 : * unsigned char *dest : Pointer to output data
203 : * array.
204 : * int dest_pitch : Stride of destination
205 : * image.
206 : * unsigned int dest_width : Width of destination image.
207 : * unsigned int dest_height : Height of destination
208 : * image.
209 : * unsigned char *temp_area : Pointer to temp work area.
210 : * unsigned char temp_area_height : Height of temp work area.
211 : * unsigned int hscale : Horizontal scale factor
212 : * numerator.
213 : * unsigned int hratio : Horizontal scale factor
214 : * denominator.
215 : * unsigned int vscale : Vertical scale factor
216 : * numerator.
217 : * unsigned int vratio : Vertical scale factor
218 : * denominator.
219 : * unsigned int interlaced : Interlace flag.
220 : *
221 : * OUTPUTS : None.
222 : *
223 : * RETURNS : void
224 : *
225 : * FUNCTION : Performs 2-tap linear interpolation in two dimensions.
226 : *
227 : * SPECIAL NOTES : Expansion is performed one band at a time to help with
228 : * caching.
229 : *
230 : ****************************************************************************/
231 0 : static void Scale2D(
232 : /*const*/
233 : unsigned char *source, int source_pitch, unsigned int source_width,
234 : unsigned int source_height, unsigned char *dest, int dest_pitch,
235 : unsigned int dest_width, unsigned int dest_height, unsigned char *temp_area,
236 : unsigned char temp_area_height, unsigned int hscale, unsigned int hratio,
237 : unsigned int vscale, unsigned int vratio, unsigned int interlaced) {
238 : /*unsigned*/
239 : int i, j, k;
240 : int bands;
241 : int dest_band_height;
242 : int source_band_height;
243 :
244 : typedef void (*Scale1D)(const unsigned char *source, int source_step,
245 : unsigned int source_scale, unsigned int source_length,
246 : unsigned char *dest, int dest_step,
247 : unsigned int dest_scale, unsigned int dest_length);
248 :
249 0 : Scale1D Scale1Dv = scale1d_c;
250 0 : Scale1D Scale1Dh = scale1d_c;
251 :
252 0 : void (*horiz_line_scale)(const unsigned char *, unsigned int, unsigned char *,
253 : unsigned int) = NULL;
254 0 : void (*vert_band_scale)(unsigned char *, unsigned int, unsigned char *,
255 : unsigned int, unsigned int) = NULL;
256 :
257 0 : int ratio_scalable = 1;
258 0 : int interpolation = 0;
259 :
260 : unsigned char *source_base;
261 : unsigned char *line_src;
262 :
263 0 : source_base = (unsigned char *)source;
264 :
265 0 : if (source_pitch < 0) {
266 : int offset;
267 :
268 0 : offset = (source_height - 1);
269 0 : offset *= source_pitch;
270 :
271 0 : source_base += offset;
272 : }
273 :
274 : /* find out the ratio for each direction */
275 0 : switch (hratio * 10 / hscale) {
276 : case 8:
277 : /* 4-5 Scale in Width direction */
278 0 : horiz_line_scale = vp8_horizontal_line_5_4_scale;
279 0 : break;
280 : case 6:
281 : /* 3-5 Scale in Width direction */
282 0 : horiz_line_scale = vp8_horizontal_line_5_3_scale;
283 0 : break;
284 : case 5:
285 : /* 1-2 Scale in Width direction */
286 0 : horiz_line_scale = vp8_horizontal_line_2_1_scale;
287 0 : break;
288 : default:
289 : /* The ratio is not acceptable now */
290 : /* throw("The ratio is not acceptable for now!"); */
291 0 : ratio_scalable = 0;
292 0 : break;
293 : }
294 :
295 0 : switch (vratio * 10 / vscale) {
296 : case 8:
297 : /* 4-5 Scale in vertical direction */
298 0 : vert_band_scale = vp8_vertical_band_5_4_scale;
299 0 : source_band_height = 5;
300 0 : dest_band_height = 4;
301 0 : break;
302 : case 6:
303 : /* 3-5 Scale in vertical direction */
304 0 : vert_band_scale = vp8_vertical_band_5_3_scale;
305 0 : source_band_height = 5;
306 0 : dest_band_height = 3;
307 0 : break;
308 : case 5:
309 : /* 1-2 Scale in vertical direction */
310 :
311 0 : if (interlaced) {
312 : /* if the content is interlaced, point sampling is used */
313 0 : vert_band_scale = vp8_vertical_band_2_1_scale;
314 : } else {
315 0 : interpolation = 1;
316 : /* if the content is progressive, interplo */
317 0 : vert_band_scale = vp8_vertical_band_2_1_scale_i;
318 : }
319 :
320 0 : source_band_height = 2;
321 0 : dest_band_height = 1;
322 0 : break;
323 : default:
324 : /* The ratio is not acceptable now */
325 : /* throw("The ratio is not acceptable for now!"); */
326 0 : ratio_scalable = 0;
327 0 : break;
328 : }
329 :
330 0 : if (ratio_scalable) {
331 0 : if (source_height == dest_height) {
332 : /* for each band of the image */
333 0 : for (k = 0; k < (int)dest_height; k++) {
334 0 : horiz_line_scale(source, source_width, dest, dest_width);
335 0 : source += source_pitch;
336 0 : dest += dest_pitch;
337 : }
338 :
339 0 : return;
340 : }
341 :
342 0 : if (interpolation) {
343 0 : if (source < source_base) source = source_base;
344 :
345 0 : horiz_line_scale(source, source_width, temp_area, dest_width);
346 : }
347 :
348 0 : for (k = 0;
349 0 : k < (int)(dest_height + dest_band_height - 1) / dest_band_height;
350 0 : k++) {
351 : /* scale one band horizontally */
352 0 : for (i = 0; i < source_band_height; i++) {
353 : /* Trap case where we could read off the base of the source buffer */
354 :
355 0 : line_src = (unsigned char *)source + i * source_pitch;
356 :
357 0 : if (line_src < source_base) line_src = source_base;
358 :
359 0 : horiz_line_scale(line_src, source_width,
360 0 : temp_area + (i + 1) * dest_pitch, dest_width);
361 : }
362 :
363 : /* Vertical scaling is in place */
364 0 : vert_band_scale(temp_area + dest_pitch, dest_pitch, dest, dest_pitch,
365 : dest_width);
366 :
367 0 : if (interpolation)
368 0 : memcpy(temp_area, temp_area + source_band_height * dest_pitch,
369 : dest_width);
370 :
371 : /* Next band... */
372 0 : source += (unsigned long)source_band_height * source_pitch;
373 0 : dest += (unsigned long)dest_band_height * dest_pitch;
374 : }
375 :
376 0 : return;
377 : }
378 :
379 0 : if (hscale == 2 && hratio == 1) Scale1Dh = scale1d_2t1_ps;
380 :
381 0 : if (vscale == 2 && vratio == 1) {
382 0 : if (interlaced)
383 0 : Scale1Dv = scale1d_2t1_ps;
384 : else
385 0 : Scale1Dv = scale1d_2t1_i;
386 : }
387 :
388 0 : if (source_height == dest_height) {
389 : /* for each band of the image */
390 0 : for (k = 0; k < (int)dest_height; k++) {
391 0 : Scale1Dh(source, 1, hscale, source_width + 1, dest, 1, hratio,
392 : dest_width);
393 0 : source += source_pitch;
394 0 : dest += dest_pitch;
395 : }
396 :
397 0 : return;
398 : }
399 :
400 0 : if (dest_height > source_height) {
401 0 : dest_band_height = temp_area_height - 1;
402 0 : source_band_height = dest_band_height * source_height / dest_height;
403 : } else {
404 0 : source_band_height = temp_area_height - 1;
405 0 : dest_band_height = source_band_height * vratio / vscale;
406 : }
407 :
408 : /* first row needs to be done so that we can stay one row ahead for vertical
409 : * zoom */
410 0 : Scale1Dh(source, 1, hscale, source_width + 1, temp_area, 1, hratio,
411 : dest_width);
412 :
413 : /* for each band of the image */
414 0 : bands = (dest_height + dest_band_height - 1) / dest_band_height;
415 :
416 0 : for (k = 0; k < bands; k++) {
417 : /* scale one band horizontally */
418 0 : for (i = 1; i < source_band_height + 1; i++) {
419 0 : if (k * source_band_height + i < (int)source_height) {
420 0 : Scale1Dh(source + i * source_pitch, 1, hscale, source_width + 1,
421 0 : temp_area + i * dest_pitch, 1, hratio, dest_width);
422 : } else { /* Duplicate the last row */
423 : /* copy temp_area row 0 over from last row in the past */
424 0 : memcpy(temp_area + i * dest_pitch, temp_area + (i - 1) * dest_pitch,
425 : dest_pitch);
426 : }
427 : }
428 :
429 : /* scale one band vertically */
430 0 : for (j = 0; j < (int)dest_width; j++) {
431 0 : Scale1Dv(&temp_area[j], dest_pitch, vscale, source_band_height + 1,
432 : &dest[j], dest_pitch, vratio, dest_band_height);
433 : }
434 :
435 : /* copy temp_area row 0 over from last row in the past */
436 0 : memcpy(temp_area, temp_area + source_band_height * dest_pitch, dest_pitch);
437 :
438 : /* move to the next band */
439 0 : source += source_band_height * source_pitch;
440 0 : dest += dest_band_height * dest_pitch;
441 : }
442 : }
443 :
444 : /****************************************************************************
445 : *
446 : * ROUTINE : vpx_scale_frame
447 : *
448 : * INPUTS : YV12_BUFFER_CONFIG *src : Pointer to frame to be
449 : * scaled.
450 : * YV12_BUFFER_CONFIG *dst : Pointer to buffer to hold
451 : * scaled frame.
452 : * unsigned char *temp_area : Pointer to temp work area.
453 : * unsigned char temp_area_height : Height of temp work area.
454 : * unsigned int hscale : Horizontal scale factor
455 : * numerator.
456 : * unsigned int hratio : Horizontal scale factor
457 : * denominator.
458 : * unsigned int vscale : Vertical scale factor
459 : * numerator.
460 : * unsigned int vratio : Vertical scale factor
461 : * denominator.
462 : * unsigned int interlaced : Interlace flag.
463 : *
464 : * OUTPUTS : None.
465 : *
466 : * RETURNS : void
467 : *
468 : * FUNCTION : Performs 2-tap linear interpolation in two dimensions.
469 : *
470 : * SPECIAL NOTES : Expansion is performed one band at a time to help with
471 : * caching.
472 : *
473 : ****************************************************************************/
474 0 : void vpx_scale_frame(YV12_BUFFER_CONFIG *src, YV12_BUFFER_CONFIG *dst,
475 : unsigned char *temp_area, unsigned char temp_height,
476 : unsigned int hscale, unsigned int hratio,
477 : unsigned int vscale, unsigned int vratio,
478 : unsigned int interlaced) {
479 : int i;
480 0 : int dw = (hscale - 1 + src->y_width * hratio) / hscale;
481 0 : int dh = (vscale - 1 + src->y_height * vratio) / vscale;
482 :
483 : /* call our internal scaling routines!! */
484 0 : Scale2D((unsigned char *)src->y_buffer, src->y_stride, src->y_width,
485 0 : src->y_height, (unsigned char *)dst->y_buffer, dst->y_stride, dw, dh,
486 : temp_area, temp_height, hscale, hratio, vscale, vratio, interlaced);
487 :
488 0 : if (dw < (int)dst->y_width)
489 0 : for (i = 0; i < dh; i++)
490 0 : memset(dst->y_buffer + i * dst->y_stride + dw - 1,
491 0 : dst->y_buffer[i * dst->y_stride + dw - 2], dst->y_width - dw + 1);
492 :
493 0 : if (dh < (int)dst->y_height)
494 0 : for (i = dh - 1; i < (int)dst->y_height; i++)
495 0 : memcpy(dst->y_buffer + i * dst->y_stride,
496 0 : dst->y_buffer + (dh - 2) * dst->y_stride, dst->y_width + 1);
497 :
498 0 : Scale2D((unsigned char *)src->u_buffer, src->uv_stride, src->uv_width,
499 0 : src->uv_height, (unsigned char *)dst->u_buffer, dst->uv_stride,
500 0 : dw / 2, dh / 2, temp_area, temp_height, hscale, hratio, vscale,
501 : vratio, interlaced);
502 :
503 0 : if (dw / 2 < (int)dst->uv_width)
504 0 : for (i = 0; i < dst->uv_height; i++)
505 0 : memset(dst->u_buffer + i * dst->uv_stride + dw / 2 - 1,
506 0 : dst->u_buffer[i * dst->uv_stride + dw / 2 - 2],
507 0 : dst->uv_width - dw / 2 + 1);
508 :
509 0 : if (dh / 2 < (int)dst->uv_height)
510 0 : for (i = dh / 2 - 1; i < (int)dst->y_height / 2; i++)
511 0 : memcpy(dst->u_buffer + i * dst->uv_stride,
512 0 : dst->u_buffer + (dh / 2 - 2) * dst->uv_stride, dst->uv_width);
513 :
514 0 : Scale2D((unsigned char *)src->v_buffer, src->uv_stride, src->uv_width,
515 0 : src->uv_height, (unsigned char *)dst->v_buffer, dst->uv_stride,
516 0 : dw / 2, dh / 2, temp_area, temp_height, hscale, hratio, vscale,
517 : vratio, interlaced);
518 :
519 0 : if (dw / 2 < (int)dst->uv_width)
520 0 : for (i = 0; i < dst->uv_height; i++)
521 0 : memset(dst->v_buffer + i * dst->uv_stride + dw / 2 - 1,
522 0 : dst->v_buffer[i * dst->uv_stride + dw / 2 - 2],
523 0 : dst->uv_width - dw / 2 + 1);
524 :
525 0 : if (dh / 2 < (int)dst->uv_height)
526 0 : for (i = dh / 2 - 1; i < (int)dst->y_height / 2; i++)
527 0 : memcpy(dst->v_buffer + i * dst->uv_stride,
528 0 : dst->v_buffer + (dh / 2 - 2) * dst->uv_stride, dst->uv_width);
529 0 : }
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