gallium: implement ycbcr->rgba tile conversion
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124e1345c9
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@ -560,6 +560,69 @@ z24s8_get_tile_rgba(unsigned *src,
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}
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/*** PIPE_FORMAT_YCBCR / PIPE_FORMAT_YCBCR_REV ***/
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/**
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* Convert YCbCr (or YCrCb) to RGBA.
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*/
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static void
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ycbcr_get_tile_rgba(ushort *src,
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unsigned w, unsigned h,
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float *p,
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unsigned dst_stride,
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boolean rev)
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{
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const float scale = 1.0f / 255.0f;
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unsigned i, j;
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/* we're assuming we're being asked for an even number of texels */
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assert((w & 1) == 0);
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for (i = 0; i < h; i++) {
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float *pRow = p;
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/* do two texels at a time */
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for (j = 0; j < w; j += 2, src += 2) {
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const ushort t0 = src[0];
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const ushort t1 = src[1];
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const ubyte y0 = (t0 >> 8) & 0xff; /* luminance */
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const ubyte y1 = (t1 >> 8) & 0xff; /* luminance */
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ubyte cb, cr;
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if (rev) {
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cb = t1 & 0xff; /* chroma U */
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cr = t0 & 0xff; /* chroma V */
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}
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else {
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cb = t0 & 0xff; /* chroma U */
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cr = t1 & 0xff; /* chroma V */
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}
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float r, g, b;
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/* even pixel: y0,cr,cb */
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r = 1.164 * (y0-16) + 1.596 * (cr-128);
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g = 1.164 * (y0-16) - 0.813 * (cr-128) - 0.391 * (cb-128);
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b = 1.164 * (y0-16) + 2.018 * (cb-128);
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pRow[0] = r * scale;
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pRow[1] = g * scale;
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pRow[2] = b * scale;
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pRow[3] = 1.0f;
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pRow += 4;
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/* odd pixel: use y1,cr,cb */
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r = 1.164 * (y1-16) + 1.596 * (cr-128);
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g = 1.164 * (y1-16) - 0.813 * (cr-128) - 0.391 * (cb-128);
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b = 1.164 * (y1-16) + 2.018 * (cb-128);
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pRow[0] = r * scale;
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pRow[1] = g * scale;
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pRow[2] = b * scale;
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pRow[3] = 1.0f;
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pRow += 4;
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}
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p += dst_stride;
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}
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}
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void
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pipe_get_tile_rgba(struct pipe_context *pipe,
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struct pipe_surface *ps,
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@ -622,6 +685,14 @@ pipe_get_tile_rgba(struct pipe_context *pipe,
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case PIPE_FORMAT_Z24S8_UNORM:
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z24s8_get_tile_rgba((unsigned *) packed, w, h, p, dst_stride);
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break;
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case PIPE_FORMAT_YCBCR:
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assert((x & 1) == 0);
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ycbcr_get_tile_rgba((ushort *) packed, w, h, p, dst_stride, FALSE);
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break;
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case PIPE_FORMAT_YCBCR_REV:
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assert((x & 1) == 0);
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ycbcr_get_tile_rgba((ushort *) packed, w, h, p, dst_stride, TRUE);
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break;
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default:
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assert(0);
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}
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