--- a/gfx/wr/swgl/src/gl.cc
+++ b/gfx/wr/swgl/src/gl.cc
@@ -3540,18 +3540,18 @@ static void linear_blit(Texture& srctex,
   sampler.filter = TextureFilter::LINEAR;
   // Compute source UVs
   int srcZOffset = srcZ * sampler.height_stride;
   vec2_scalar srcUV(srcReq.x0, srcReq.y0);
   vec2_scalar srcDUV(float(srcReq.width()) / dstReq.width(),
                      float(srcReq.height()) / dstReq.height());
   // Skip to clamped source start
   srcUV += srcDUV * vec2_scalar(dstBounds.x0, dstBounds.y0);
-  // Scale source UVs by linear-interpolation precision
-  srcUV = linearQuantize(srcUV, 128);
+  // Offset source UVs to texel centers and scale by lerp precision
+  srcUV = linearQuantize(srcUV + 0.5f, 128);
   srcDUV *= 128.0f;
   // Calculate dest pointer from clamped offsets
   int bpp = dsttex.bpp();
   int destStride = dsttex.stride(bpp);
   char* dest = dsttex.sample_ptr(dstReq, dstBounds, dstZ, invertY);
   // Inverted Y must step downward along dest rows
   if (invertY) {
     destStride = -destStride;

--- a/gfx/wr/swgl/src/glsl.h
+++ b/gfx/wr/swgl/src/glsl.h
@@ -2438,18 +2438,19 @@ SI T mix(T x, T y, float a) {
 }
 
 template <typename T>
 SI T mix(T x, T y, vec4_scalar a) {
   return T{mix(x.x, y.x, a.x), mix(x.y, y.y, a.y), mix(x.z, y.z, a.z),
            mix(x.w, y.w, a.w)};
 }
 
-// Scale texture coords for quantization, subtract offset for filtering,
-// and round to nearest 1/scale increment
+// Scale texture coords for quantization, subtract offset for filtering
+// (assuming coords already offset to texel centers), and round to nearest
+// 1/scale increment
 template <typename T>
 SI T linearQuantize(T P, float scale) {
   return P * scale + (0.5f - 0.5f * scale);
 }
 
 // Helper version that also scales normalized texture coords for sampler
 template <typename T, typename S>
 SI T linearQuantize(T P, float scale, S sampler) {