Bug fixes.

Author: aous72

src/core/transform/ojph_colour.cpp

@@ -419,12 +419,12 @@ namespace ojph {
       }
       else
       {
-        const si32 half = INT_MIN;
+        const ui32 half = (ui32)INT_MIN;
         for (ui32 i = width; i > 0; --i) {
-          si32 v = *sp++;
+          ui32 v = (ui32)*sp++;
           v <<= shift;
           v -= half;
-          *dp++ = (float)v * mul;
+          *dp++ = (float)(si32)v * mul;
         }
       }
     }

src/core/transform/ojph_colour_wasm.cpp

@@ -391,13 +391,13 @@ namespace ojph {
       }
       else
       {
-        v128_t half = wasm_f32x4_splat(0.5f);
+        v128_t half = wasm_i32x4_splat(INT_MIN);
         for (ui32 i = width; i > 0; i -= 4, sp += 4, dp += 4) {
           v128_t t = wasm_v128_load(sp);
           v128_t u = wasm_i32x4_shl(t, shift);
+          u = wasm_i32x4_sub(u, half);
           v128_t v = wasm_f32x4_convert_i32x4(u);
           v = wasm_f32x4_mul(v, mul);
-          v = wasm_f32x4_sub(v, half);
           wasm_v128_store(dp, v);
         }
       }