mirror() borrowed from dwt.c, this could be moved to libavutil and made public API, Ill submit a patch for this Fixes Ticket1278
Showing the changes to libavfilter/transform.c (1 of 1 file). Show all
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| @@ -25,6 +25,7 @@ · 24 unmodified lines | |||
| 25 | */ | 25 | */ |
| 26 | 26 | ||
| 27 | #include "libavutil/common.h" | 27 | #include "libavutil/common.h" |
| 28 | #include "libavutil/avassert.h" | ||
| 28 | 29 | ||
| 29 | #include "transform.h" | 30 | #include "transform.h" |
| 30 | 31 | ||
| @@ -135,6 +136,16 @@ void avfilter_mul_matrix(const float *m1, float scalar, float *result) · 104 unmodified lines | |||
| 135 | result[i] = m1[i] * scalar; | 136 | result[i] = m1[i] * scalar; |
| 136 | } | 137 | } |
| 137 | 138 | ||
| 139 | static inline int mirror(int v, int m) | ||
| 140 | { | ||
| 141 | while ((unsigned)v > (unsigned)m) { | ||
| 142 | v = -v; | ||
| 143 | if (v < 0) | ||
| 144 | v += 2 * m; | ||
| 145 | } | ||
| 146 | return v; | ||
| 147 | } | ||
| 148 | |||
| 138 | void avfilter_transform(const uint8_t *src, uint8_t *dst, | 149 | void avfilter_transform(const uint8_t *src, uint8_t *dst, |
| 139 | int src_stride, int dst_stride, | 150 | int src_stride, int dst_stride, |
| 140 | int width, int height, const float *matrix, | 151 | int width, int height, const float *matrix, |
| @@ -173,8 +184,11 @@ void avfilter_transform(const uint8_t *src, uint8_t *dst, · 32 unmodified lines | |||
| 173 | def = src[(int)y_s * src_stride + (int)x_s]; | 184 | def = src[(int)y_s * src_stride + (int)x_s]; |
| 174 | break; | 185 | break; |
| 175 | case FILL_MIRROR: | 186 | case FILL_MIRROR: |
| 176 | y_s = (y_s < 0) ? -y_s : (y_s >= height) ? (height + height - y_s) : y_s; | 187 | x_s = mirror(x_s, width-1); |
| 177 | x_s = (x_s < 0) ? -x_s : (x_s >= width) ? (width + width - x_s) : x_s; | 188 | y_s = mirror(y_s, height-1); |
| 189 | |||
| 190 | av_assert2(x_s >= 0 && y_s >= 0); | ||
| 191 | av_assert2(x_s < width && y_s < height); | ||
| 178 | def = src[(int)y_s * src_stride + (int)x_s]; | 192 | def = src[(int)y_s * src_stride + (int)x_s]; |
| 179 | } | 193 | } |
| 180 | 194 | ||