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libavcodec/texturedsp : add rgtc1u_alpha decoding func

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this func decode an rgtc1 texture and overwrite only the alpha channel
of the dest RGBA picture

Signed-off-by: Tom Butterworth <bangnoise@gmail.com>
This commit is contained in:
Martin Vignali 2017-09-28 21:36:58 +02:00 committed by Tom Butterworth
parent 0655810072
commit d4d4629dfe
2 changed files with 33 additions and 9 deletions
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41
libavcodec/texturedsp.c
View File

@ -413,7 +413,7 @@ static int dxt5ys_block(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
static inline void rgtc_block_internal(uint8_t *dst, ptrdiff_t stride,
const uint8_t *block,
const int *color_tab)
const int *color_tab, int alpha)
{
uint8_t indices[16];
int x, y;
@ -429,14 +429,20 @@ static inline void rgtc_block_internal(uint8_t *dst, ptrdiff_t stride,
int i = indices[x + y * 4];
/* Interval expansion from [-1 1] or [0 1] to [0 255]. */
int c = color_tab[i];
uint32_t pixel = RGBA(c, c, c, 255U);
AV_WL32(dst + x * 4 + y * stride, pixel);
if (alpha){
dst [x * 4 + y * stride + 3] = (uint8_t)c;
}
else{
uint32_t pixel = RGBA(c, c, c, 255U);
AV_WL32(dst + x * 4 + y * stride, pixel);
}
}
}
}
static inline void rgtc1_block_internal(uint8_t *dst, ptrdiff_t stride,
const uint8_t *block, int sign)
const uint8_t *block, int sign, int alpha)
{
int color_table[8];
int r0, r1;
@ -472,7 +478,7 @@ static inline void rgtc1_block_internal(uint8_t *dst, ptrdiff_t stride,
color_table[7] = 255; /* max range */ // bit code 111
}
rgtc_block_internal(dst, stride, block, color_table);
rgtc_block_internal(dst, stride, block, color_table, alpha);
}
/**
@ -486,7 +492,7 @@ static inline void rgtc1_block_internal(uint8_t *dst, ptrdiff_t stride,
*/
static int rgtc1s_block(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
{
rgtc1_block_internal(dst, stride, block, 1);
rgtc1_block_internal(dst, stride, block, 1, 0);
return 8;
}
@ -502,7 +508,23 @@ static int rgtc1s_block(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
*/
static int rgtc1u_block(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
{
rgtc1_block_internal(dst, stride, block, 0);
rgtc1_block_internal(dst, stride, block, 0, 0);
return 8;
}
/**
* Decompress one block of a RGRC1 texture with unsigned components
* and overwrite the alpha component in 'dst' (RGBA data).
*
* @param dst output buffer.
* @param stride scanline in bytes.
* @param block block to decompress.
* @return how much texture data has been consumed.
*/
static int rgtc1u_alpha_block(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
{
rgtc1_block_internal(dst, stride, block, 0, 1);
return 8;
}
@ -516,8 +538,8 @@ static inline void rgtc2_block_internal(uint8_t *dst, ptrdiff_t stride,
int x, y;
/* Decompress the two channels separately and interleave them afterwards. */
rgtc1_block_internal(c0, 16, block, sign);
rgtc1_block_internal(c1, 16, block + 8, sign);
rgtc1_block_internal(c0, 16, block, sign, 0);
rgtc1_block_internal(c1, 16, block + 8, sign, 0);
/* B is rebuilt exactly like a normal map. */
for (y = 0; y < 4; y++) {
@ -608,6 +630,7 @@ av_cold void ff_texturedsp_init(TextureDSPContext *c)
c->dxt5ys_block = dxt5ys_block;
c->rgtc1s_block = rgtc1s_block;
c->rgtc1u_block = rgtc1u_block;
c->rgtc1u_alpha_block = rgtc1u_alpha_block;
c->rgtc2s_block = rgtc2s_block;
c->rgtc2u_block = rgtc2u_block;
c->dxn3dc_block = dxn3dc_block;

1
libavcodec/texturedsp.h
View File

@ -53,6 +53,7 @@ typedef struct TextureDSPContext {
int (*dxt5ys_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
int (*rgtc1s_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
int (*rgtc1u_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
int (*rgtc1u_alpha_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
int (*rgtc2s_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
int (*rgtc2u_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
int (*dxn3dc_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);