- if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
- GLfloat *dest, *src, *tmpImage, *convImage;
- GLint row;
-
- tmpImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
- if (!tmpImage) {
- _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
- return;
- }
- convImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
- if (!convImage) {
- _mesa_free(tmpImage);
- _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
- return;
- }
-
- /* read full RGBA, FLOAT image */
- dest = tmpImage;
- for (row = 0; row < height; row++, y++) {
- if (fb->Visual.rgbMode) {
- _swrast_read_rgba_span(ctx, rb, width, x, y, GL_FLOAT, dest);
- }
- else {
- GLuint index[MAX_WIDTH];
- ASSERT(rb->DataType == GL_UNSIGNED_INT);
- rb->GetRow(ctx, rb, width, x, y, index);
- _mesa_apply_ci_transfer_ops(ctx,
- transferOps & IMAGE_SHIFT_OFFSET_BIT,
- width, index);
- _mesa_map_ci_to_rgba(ctx, width, index, (GLfloat (*)[4]) dest);
- }
- _mesa_apply_rgba_transfer_ops(ctx,
- transferOps & IMAGE_PRE_CONVOLUTION_BITS,
- width, (GLfloat (*)[4]) dest);
- dest += width * 4;
- }
-
- /* do convolution */
- if (ctx->Pixel.Convolution2DEnabled) {
- _mesa_convolve_2d_image(ctx, &width, &height, tmpImage, convImage);
- }
- else {
- ASSERT(ctx->Pixel.Separable2DEnabled);
- _mesa_convolve_sep_image(ctx, &width, &height, tmpImage, convImage);
- }
- _mesa_free(tmpImage);
-
- /* finish transfer ops and pack the resulting image */
- src = convImage;
- for (row = 0; row < height; row++) {
- GLvoid *dest;
- dest = _mesa_image_address2d(packing, pixels, width, height,
- format, type, row, 0);
- _mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) src,
- format, type, dest, packing,
- transferOps & IMAGE_POST_CONVOLUTION_BITS);
- src += width * 4;
- }
- _mesa_free(convImage);
- }
- else {
- /* no convolution */