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exr: cache some values

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Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2012-07-11 20:40:23 +00:00
parent 65219c3851
commit a568a84edf
1 changed files with 10 additions and 5 deletions
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15
libavcodec/exr.c
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@ -206,6 +206,8 @@ static int decode_frame(AVCodecContext *avctx,
unsigned int ymax = ~0;
unsigned int xdelta = ~0;
int out_line_size;
int bxmin, axmax;
int scan_lines_per_block;
unsigned long scan_line_size;
unsigned long uncompressed_size;
@ -452,6 +454,9 @@ static int decode_frame(AVCodecContext *avctx,
avcodec_set_dimensions(avctx, w, h);
}
bxmin = xmin * 2 * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components;
axmax = (avctx->width - (xmax + 1)) * 2 * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components;
out_line_size = avctx->width * 2 * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components;
scan_line_size = xdelta * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components * FFMAX(2 * s->bits_per_color_id, 1);
uncompressed_size = scan_line_size * scan_lines_per_block;
@ -472,7 +477,7 @@ static int decode_frame(AVCodecContext *avctx,
// Zero out the start if ymin is not 0
for (y = 0; y < ymin; y++) {
memset(ptr, 0, avctx->width * 2 * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components);
memset(ptr, 0, out_line_size);
ptr += stride;
}
@ -493,7 +498,7 @@ static int decode_frame(AVCodecContext *avctx,
av_log(avctx, AV_LOG_WARNING, "Line offset for line %d is out of reach setting it to black\n", y);
for (i = 0; i < scan_lines_per_block && y + i <= ymax; i++, ptr += stride) {
ptr_x = (uint16_t *)ptr;
memset(ptr_x, 0, avctx->width * 2 * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components);
memset(ptr_x, 0, out_line_size);
}
} else {
const uint8_t *red_channel_buffer, *green_channel_buffer, *blue_channel_buffer, *alpha_channel_buffer = 0;
@ -532,7 +537,7 @@ static int decode_frame(AVCodecContext *avctx,
ptr_x = (uint16_t *)ptr;
// Zero out the start if xmin is not 0
memset(ptr_x, 0, xmin * 2 * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components);
memset(ptr_x, 0, bxmin);
ptr_x += xmin * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components;
if (s->bits_per_color_id == 2) {
// 32-bit
@ -555,7 +560,7 @@ static int decode_frame(AVCodecContext *avctx,
}
// Zero out the end if xmax+1 is not w
memset(ptr_x, 0, (avctx->width - (xmax + 1)) * 2 * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components);
memset(ptr_x, 0, axmax);
red_channel_buffer += scan_line_size;
green_channel_buffer += scan_line_size;
@ -569,7 +574,7 @@ static int decode_frame(AVCodecContext *avctx,
// Zero out the end if ymax+1 is not h
for (y = ymax + 1; y < avctx->height; y++) {
memset(ptr, 0, avctx->width * 2 * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components);
memset(ptr, 0, out_line_size);
ptr += stride;
}