diff options
| -rw-r--r-- | src/gallium/auxiliary/util/p_tile.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/util/p_tile.c b/src/gallium/auxiliary/util/p_tile.c index 287d783981..c9a9c8f4f7 100644 --- a/src/gallium/auxiliary/util/p_tile.c +++ b/src/gallium/auxiliary/util/p_tile.c @@ -560,6 +560,69 @@ z24s8_get_tile_rgba(unsigned *src, } +/*** PIPE_FORMAT_YCBCR / PIPE_FORMAT_YCBCR_REV ***/ + +/** + * Convert YCbCr (or YCrCb) to RGBA. + */ +static void +ycbcr_get_tile_rgba(ushort *src, + unsigned w, unsigned h, + float *p, + unsigned dst_stride, + boolean rev) +{ + const float scale = 1.0f / 255.0f; + unsigned i, j; + + /* we're assuming we're being asked for an even number of texels */ + assert((w & 1) == 0); + + for (i = 0; i < h; i++) { + float *pRow = p; + /* do two texels at a time */ + for (j = 0; j < w; j += 2, src += 2) { + const ushort t0 = src[0]; + const ushort t1 = src[1]; + const ubyte y0 = (t0 >> 8) & 0xff; /* luminance */ + const ubyte y1 = (t1 >> 8) & 0xff; /* luminance */ + ubyte cb, cr; + if (rev) { + cb = t1 & 0xff; /* chroma U */ + cr = t0 & 0xff; /* chroma V */ + } + else { + cb = t0 & 0xff; /* chroma U */ + cr = t1 & 0xff; /* chroma V */ + } + float r, g, b; + + /* even pixel: y0,cr,cb */ + r = 1.164 * (y0-16) + 1.596 * (cr-128); + g = 1.164 * (y0-16) - 0.813 * (cr-128) - 0.391 * (cb-128); + b = 1.164 * (y0-16) + 2.018 * (cb-128); + pRow[0] = r * scale; + pRow[1] = g * scale; + pRow[2] = b * scale; + pRow[3] = 1.0f; + pRow += 4; + + /* odd pixel: use y1,cr,cb */ + r = 1.164 * (y1-16) + 1.596 * (cr-128); + g = 1.164 * (y1-16) - 0.813 * (cr-128) - 0.391 * (cb-128); + b = 1.164 * (y1-16) + 2.018 * (cb-128); + pRow[0] = r * scale; + pRow[1] = g * scale; + pRow[2] = b * scale; + pRow[3] = 1.0f; + pRow += 4; + + } + p += dst_stride; + } +} + + void pipe_get_tile_rgba(struct pipe_context *pipe, struct pipe_surface *ps, @@ -622,6 +685,14 @@ pipe_get_tile_rgba(struct pipe_context *pipe, case PIPE_FORMAT_Z24S8_UNORM: z24s8_get_tile_rgba((unsigned *) packed, w, h, p, dst_stride); break; + case PIPE_FORMAT_YCBCR: + assert((x & 1) == 0); + ycbcr_get_tile_rgba((ushort *) packed, w, h, p, dst_stride, FALSE); + break; + case PIPE_FORMAT_YCBCR_REV: + assert((x & 1) == 0); + ycbcr_get_tile_rgba((ushort *) packed, w, h, p, dst_stride, TRUE); + break; default: assert(0); } |