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Fix building of reference border in the bottom of the frame.

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- Don't write to the top-left corner during construction of left border,
  because that is handled later that is handled later.
This commit is contained in:
Ari Koivula 2014-01-23 16:44:42 +02:00
parent ca454b67df
commit 9f855c16db
1 changed files with 9 additions and 4 deletions
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13
src/intra.c
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@ -496,6 +496,7 @@ void intra_build_reference_border(picture *pic, int32_t x_luma, int32_t y_luma,
const pixel dc_val = 1 << (g_bitdepth - 1);
const int is_chroma = chroma ? 1 : 0;
const int src_width = pic->width >> is_chroma;
const int src_height = pic->height >> is_chroma;
// input picture pointer
const pixel * const src = (!chroma) ? pic->y_recdata : ((chroma == 1) ? pic->u_recdata : pic->v_recdata);
@ -522,7 +523,9 @@ void intra_build_reference_border(picture *pic, int32_t x_luma, int32_t y_luma,
num_ref_pixels = MIN(num_ref_pixels, outwidth - 1);
// There are no coded pixels below the bottom of the LCU due to raster scan order.
if ((num_ref_pixels << is_chroma) + y_in_lcu > LCU_WIDTH) {
if (num_ref_pixels + y > src_height) {
num_ref_pixels = src_height - y;
} else if ((num_ref_pixels << is_chroma) + y_in_lcu > LCU_WIDTH) {
num_ref_pixels = (LCU_WIDTH - y_in_lcu) >> is_chroma;
}
// Copy pixels from coded CUs.
@ -538,7 +541,7 @@ void intra_build_reference_border(picture *pic, int32_t x_luma, int32_t y_luma,
// If we are on the left edge, extend the first pixel of the top row.
pixel nearest_pixel = y > 0 ? src_shifted[-src_width] : dc_val;
int i;
for (i = 0; i < outwidth - 1; i++) {
for (i = 1; i < outwidth - 1; i++) {
dst[i * dststride] = nearest_pixel;
}
}
@ -578,9 +581,11 @@ void intra_build_reference_border(picture *pic, int32_t x_luma, int32_t y_luma,
}
}
// Topleft corner sample
// If top-left corner sample doesn't exist, use the sample from below.
// Unavailable samples on the left boundary are copied from below if
// available. This is the only place they are available because we don't
// support constrained intra prediction.
dst[0] = (x > 0 && y > 0) ? src_shifted[-src_width - 1] : dst[dststride];
}
const int32_t ang_table[9] = {0, 2, 5, 9, 13, 17, 21, 26, 32};