2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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.
14 #include "vpx/vpx_image.h"
16 static vpx_image_t *img_alloc_helper(vpx_image_t *img,
20 unsigned int stride_align,
21 unsigned char *img_data)
24 unsigned int h, w, s, xcs, ycs, bps;
27 /* Treat align==0 like align==1 */
31 /* Validate alignment (must be power of 2) */
32 if (stride_align & (stride_align - 1))
35 /* Get sample size for this format */
38 case VPX_IMG_FMT_RGB32:
39 case VPX_IMG_FMT_RGB32_LE:
40 case VPX_IMG_FMT_ARGB:
41 case VPX_IMG_FMT_ARGB_LE:
44 case VPX_IMG_FMT_RGB24:
45 case VPX_IMG_FMT_BGR24:
48 case VPX_IMG_FMT_RGB565:
49 case VPX_IMG_FMT_RGB565_LE:
50 case VPX_IMG_FMT_RGB555:
51 case VPX_IMG_FMT_RGB555_LE:
52 case VPX_IMG_FMT_UYVY:
53 case VPX_IMG_FMT_YUY2:
54 case VPX_IMG_FMT_YVYU:
57 case VPX_IMG_FMT_I420:
58 case VPX_IMG_FMT_YV12:
59 case VPX_IMG_FMT_VPXI420:
60 case VPX_IMG_FMT_VPXYV12:
68 /* Get chroma shift values for this format */
71 case VPX_IMG_FMT_I420:
72 case VPX_IMG_FMT_YV12:
73 case VPX_IMG_FMT_VPXI420:
74 case VPX_IMG_FMT_VPXYV12:
84 case VPX_IMG_FMT_I420:
85 case VPX_IMG_FMT_YV12:
86 case VPX_IMG_FMT_VPXI420:
87 case VPX_IMG_FMT_VPXYV12:
95 /* Calculate storage sizes given the chroma subsampling */
96 align = (1 << xcs) - 1;
97 w = (d_w + align) & ~align;
98 align = (1 << ycs) - 1;
99 h = (d_h + align) & ~align;
100 s = (fmt & VPX_IMG_FMT_PLANAR) ? w : bps * w / 8;
101 s = (s + stride_align - 1) & ~(stride_align - 1);
103 /* Allocate the new image */
106 img = (vpx_image_t *)calloc(1, sizeof(vpx_image_t));
111 img->self_allocd = 1;
115 memset(img, 0, sizeof(vpx_image_t));
118 img->img_data = img_data;
122 img->img_data = malloc((fmt & VPX_IMG_FMT_PLANAR) ? h * w * bps / 8 : h * s);
123 img->img_data_owner = 1;
132 img->x_chroma_shift = xcs;
133 img->y_chroma_shift = ycs;
136 /* Calculate strides */
137 img->stride[VPX_PLANE_Y] = img->stride[VPX_PLANE_ALPHA] = s;
138 img->stride[VPX_PLANE_U] = img->stride[VPX_PLANE_V] = s >> xcs;
140 /* Default viewport to entire image */
141 if (!vpx_img_set_rect(img, 0, 0, d_w, d_h))
149 vpx_image_t *vpx_img_alloc(vpx_image_t *img,
153 unsigned int stride_align)
155 return img_alloc_helper(img, fmt, d_w, d_h, stride_align, NULL);
158 vpx_image_t *vpx_img_wrap(vpx_image_t *img,
162 unsigned int stride_align,
163 unsigned char *img_data)
165 return img_alloc_helper(img, fmt, d_w, d_h, stride_align, img_data);
168 int vpx_img_set_rect(vpx_image_t *img,
176 if (x + w <= img->w && y + h <= img->h)
181 /* Calculate plane pointers */
182 if (!(img->fmt & VPX_IMG_FMT_PLANAR))
184 img->planes[VPX_PLANE_PACKED] =
185 img->img_data + x * img->bps / 8 + y * img->stride[VPX_PLANE_PACKED];
189 data = img->img_data;
191 if (img->fmt & VPX_IMG_FMT_HAS_ALPHA)
193 img->planes[VPX_PLANE_ALPHA] =
194 data + x + y * img->stride[VPX_PLANE_ALPHA];
195 data += img->h * img->stride[VPX_PLANE_ALPHA];
198 img->planes[VPX_PLANE_Y] = data + x + y * img->stride[VPX_PLANE_Y];
199 data += img->h * img->stride[VPX_PLANE_Y];
201 if (!(img->fmt & VPX_IMG_FMT_UV_FLIP))
203 img->planes[VPX_PLANE_U] = data
204 + (x >> img->x_chroma_shift)
205 + (y >> img->y_chroma_shift) * img->stride[VPX_PLANE_U];
206 data += (img->h >> img->y_chroma_shift) * img->stride[VPX_PLANE_U];
207 img->planes[VPX_PLANE_V] = data
208 + (x >> img->x_chroma_shift)
209 + (y >> img->y_chroma_shift) * img->stride[VPX_PLANE_V];
213 img->planes[VPX_PLANE_V] = data
214 + (x >> img->x_chroma_shift)
215 + (y >> img->y_chroma_shift) * img->stride[VPX_PLANE_V];
216 data += (img->h >> img->y_chroma_shift) * img->stride[VPX_PLANE_V];
217 img->planes[VPX_PLANE_U] = data
218 + (x >> img->x_chroma_shift)
219 + (y >> img->y_chroma_shift) * img->stride[VPX_PLANE_U];
229 void vpx_img_flip(vpx_image_t *img)
231 /* Note: In the calculation pointer adjustment calculation, we want the
232 * rhs to be promoted to a signed type. Section 6.3.1.8 of the ISO C99
233 * standard indicates that if the adjustment parameter is unsigned, the
234 * stride parameter will be promoted to unsigned, causing errors when
235 * the lhs is a larger type than the rhs.
237 img->planes[VPX_PLANE_Y] += (signed)(img->d_h - 1) * img->stride[VPX_PLANE_Y];
238 img->stride[VPX_PLANE_Y] = -img->stride[VPX_PLANE_Y];
240 img->planes[VPX_PLANE_U] += (signed)((img->d_h >> img->y_chroma_shift) - 1)
241 * img->stride[VPX_PLANE_U];
242 img->stride[VPX_PLANE_U] = -img->stride[VPX_PLANE_U];
244 img->planes[VPX_PLANE_V] += (signed)((img->d_h >> img->y_chroma_shift) - 1)
245 * img->stride[VPX_PLANE_V];
246 img->stride[VPX_PLANE_V] = -img->stride[VPX_PLANE_V];
248 img->planes[VPX_PLANE_ALPHA] += (signed)(img->d_h - 1) * img->stride[VPX_PLANE_ALPHA];
249 img->stride[VPX_PLANE_ALPHA] = -img->stride[VPX_PLANE_ALPHA];
252 void vpx_img_free(vpx_image_t *img)
256 if (img->img_data && img->img_data_owner)
259 if (img->self_allocd)