Add an x86 optimized version of extend().

[fjl] / idct_reference.c

diff --git a/idct_reference.c b/idct_reference.c
index e710de3d1306500f151bae818ecec2e767510b43..f74ad0ba2d11aa4d71ffb50c52ad0125108279de 100644 (file)
--- a/idct_reference.c
+++ b/idct_reference.c
@@ -43,7 +43,7 @@ void idct_reference(const int16_t* input, const void* userdata, uint8_t* output)
 
        for (unsigned y = 0; y < 8; ++y) {
                for (unsigned x = 0; x < 8; ++x) {
 
        for (unsigned y = 0; y < 8; ++y) {
                for (unsigned x = 0; x < 8; ++x) {

-                       double val = temp[y * DCTSIZE + x];
+                       double val = temp[y * DCTSIZE + x] + 128.0;

                        if (val < 0.0) {
                                output[y * DCTSIZE + x] = 0;
                        } else if (val >= 255.0) {
                        if (val < 0.0) {
                                output[y * DCTSIZE + x] = 0;
                        } else if (val >= 255.0) {