fix/add some comments

        return false;

    }

    /*

    // copybit doesn't say anything about filtering, so we can't

    // discriminate. On msm7k, copybit will always filter.

    // the code below handles min/mag filters, we keep it as a reference.

#ifdef MIN_MAG_FILTER

    int32_t texelArea = gglMulx(dtdy, dsdx);

    if (texelArea < FIXED_ONE && textureObject->mag_filter != GL_LINEAR) {

        // Non-linear filtering on a texture enlargement.

        LOGD_IF(DEBUG_COPYBIT, "mag filter is not GL_LINEAR");

        return false;

    }

    if (texelArea > FIXED_ONE && textureObject->min_filter != GL_LINEAR) {

        // Non-linear filtering on an texture shrink.

        LOGD_IF(DEBUG_COPYBIT, "min filter is not GL_LINEAR");

        return false;

    }

    */

#endif

    const uint32_t enables = c->rasterizer.state.enables;

    int planeAlpha = 255;

    // we detect if we're dealing with a rectangle, by comparing the

    // rectangles {v0,v2} and {v1,v3} which should be identical.

    // NOTE: we should check that the rectangle is window aligned, however

    // if we do that, the optimization won't be taken in a lot of cases.

    // Since this code is intended to be used with SurfaceFlinger only,

    // so it's okay...

    const vec4_t& v0 = c->vc.vBuffer[0].window;

    const vec4_t& v1 = c->vc.vBuffer[1].window;

    const vec4_t& v2 = c->vc.vBuffer[2].window;