Added BGRA support to qcms.

third_party/qcms/src/transform-sse1.c

Index: third_party/qcms/src/transform-sse1.c
diff --git a/third_party/qcms/src/transform-sse1.c b/third_party/qcms/src/transform-sse1.c
index 2f34db5c1672d6df25653c381df9fcc1663488b6..a696b812db9a01fed3d42db1bf15570186768b57 100644
--- a/third_party/qcms/src/transform-sse1.c
+++ b/third_party/qcms/src/transform-sse1.c
@@ -272,3 +272,128 @@ void qcms_transform_data_rgba_out_lut_sse1(qcms_transform *transform,
 
     _mm_empty();
 }
+
+void qcms_transform_data_bgra_out_lut_sse1(qcms_transform *transform,
+                                           unsigned char *src,
+                                           unsigned char *dest,
+                                           size_t length)
+{
+    unsigned int i;
+    float (*mat)[4] = transform->matrix;
+    char input_back[32];
+    /* Ensure we have a buffer that's 16 byte aligned regardless of the original
+     * stack alignment. We can't use __attribute__((aligned(16))) or __declspec(align(32))
+     * because they don't work on stack variables. gcc 4.4 does do the right thing
+     * on x86 but that's too new for us right now. For more info: gcc bug #16660 */
+    float const * input = (float*)(((uintptr_t)&input_back[16]) & ~0xf);
+    /* share input and output locations to save having to keep the
+     * locations in separate registers */
+    uint32_t const * output = (uint32_t*)input;
+
+    /* deref *transform now to avoid it in loop */
+    const float *igtbl_r = transform->input_gamma_table_r;
+    const float *igtbl_g = transform->input_gamma_table_g;
+    const float *igtbl_b = transform->input_gamma_table_b;
+
+    /* deref *transform now to avoid it in loop */
+    const uint8_t *otdata_r = &transform->output_table_r->data[0];
+    const uint8_t *otdata_g = &transform->output_table_g->data[0];
+    const uint8_t *otdata_b = &transform->output_table_b->data[0];
+
+    /* input matrix values never change */
+    const __m128 mat0  = _mm_load_ps(mat[0]);
+    const __m128 mat1  = _mm_load_ps(mat[1]);
+    const __m128 mat2  = _mm_load_ps(mat[2]);
+
+    /* these values don't change, either */
+    const __m128 max   = _mm_load_ps(clampMaxValueX4);
+    const __m128 min   = _mm_setzero_ps();
+    const __m128 scale = _mm_load_ps(floatScaleX4);
+
+    /* working variables */
+    __m128 vec_r, vec_g, vec_b, result;
+    unsigned char alpha;
+
+    /* CYA */
+    if (!length)
+        return;
+
+    /* one pixel is handled outside of the loop */
+    length--;
+
+    /* setup for transforming 1st pixel */
+    vec_b = _mm_load_ss(&igtbl_b[src[0]]);
+    vec_g = _mm_load_ss(&igtbl_g[src[1]]);
+    vec_r = _mm_load_ss(&igtbl_r[src[2]]);
+    alpha = src[3];
+    src += 4;
+
+    /* transform all but final pixel */
+
+    for (i=0; i<length; i++)
+    {
+        /* position values from gamma tables */
+        vec_r = _mm_shuffle_ps(vec_r, vec_r, 0);
+        vec_g = _mm_shuffle_ps(vec_g, vec_g, 0);
+        vec_b = _mm_shuffle_ps(vec_b, vec_b, 0);
+
+        /* gamma * matrix */
+        vec_r = _mm_mul_ps(vec_r, mat0);
+        vec_g = _mm_mul_ps(vec_g, mat1);
+        vec_b = _mm_mul_ps(vec_b, mat2);
+
+        /* store alpha for this pixel; load alpha for next */
+        dest[3] = alpha;
+        alpha   = src[3];
+
+        /* crunch, crunch, crunch */
+        vec_r  = _mm_add_ps(vec_r, _mm_add_ps(vec_g, vec_b));
+        vec_r  = _mm_max_ps(min, vec_r);
+        vec_r  = _mm_min_ps(max, vec_r);
+        result = _mm_mul_ps(vec_r, scale);
+
+        /* store calc'd output tables indices */
+        *((__m64 *)&output[0]) = _mm_cvtps_pi32(result);
+        result = _mm_movehl_ps(result, result);
+        *((__m64 *)&output[2]) = _mm_cvtps_pi32(result);
+
+        /* load gamma values for next loop while store completes */
+        vec_b = _mm_load_ss(&igtbl_b[src[0]]);
+        vec_g = _mm_load_ss(&igtbl_g[src[1]]);
+        vec_r = _mm_load_ss(&igtbl_r[src[2]]);
+        src += 4;
+
+        /* use calc'd indices to output RGB values */
+        dest[0] = otdata_b[output[2]];
+        dest[1] = otdata_g[output[1]];
+        dest[2] = otdata_r[output[0]];
+        dest += 4;
+    }
+
+    /* handle final (maybe only) pixel */
+
+    vec_r = _mm_shuffle_ps(vec_r, vec_r, 0);
+    vec_g = _mm_shuffle_ps(vec_g, vec_g, 0);
+    vec_b = _mm_shuffle_ps(vec_b, vec_b, 0);
+
+    vec_r = _mm_mul_ps(vec_r, mat0);
+    vec_g = _mm_mul_ps(vec_g, mat1);
+    vec_b = _mm_mul_ps(vec_b, mat2);
+
+    dest[3] = alpha;
+
+    vec_r  = _mm_add_ps(vec_r, _mm_add_ps(vec_g, vec_b));
+    vec_r  = _mm_max_ps(min, vec_r);
+    vec_r  = _mm_min_ps(max, vec_r);
+    result = _mm_mul_ps(vec_r, scale);
+
+    *((__m64 *)&output[0]) = _mm_cvtps_pi32(result);
+    result = _mm_movehl_ps(result, result);
+    *((__m64 *)&output[2]) = _mm_cvtps_pi32(result);
+
+    dest[0] = otdata_b[output[2]];
+    dest[1] = otdata_g[output[1]];
+    dest[2] = otdata_r[output[0]];
+
+    _mm_empty();
+}