-
- zoomed.arrayMask |= SPAN_Z;
- if (fog)
- zoomed.arrayMask |= SPAN_FOG;
-
- /* write the span */
- for (zoomed.y = r0; zoomed.y < r1; zoomed.y++) {
- SAVE_SPAN(zoomed);
- ASSERT((zoomed.interpMask & SPAN_RGBA) == 0);
- _mesa_write_rgba_span(ctx, &zoomed, GL_BITMAP);
- RESTORE_SPAN(zoomed);
- /* problem here: "zoomed" can change inside
- "_mesa_write_rgba_span". Best solution: make copy "tmpspan"
- and give to function, but too slow */
- }
-}
-
-
-
-void
-_mesa_write_zoomed_rgb_span( GLcontext *ctx,
- GLuint n, GLint x, GLint y, const GLdepth z[],
- const GLfloat *fog,
- CONST GLchan rgb[][3], GLint y0 )
-{
- GLint m;
- GLint r0, r1, row, r;
- GLint i, j, skipcol;
- GLint maxwidth = MIN2( ctx->DrawBuffer->Width, MAX_WIDTH );
- struct sw_span zoomed;
-
- INIT_SPAN(zoomed);
- zoomed.arrayMask |= SPAN_RGBA;
-
- if (fog && ctx->Fog.Enabled)
- zoomed.arrayMask |= SPAN_FOG;
-
-
- /* compute width of output row */
- m = (GLint) ABSF( n * ctx->Pixel.ZoomX );
- if (m==0) {
- return;
- }
- if (ctx->Pixel.ZoomX<0.0) {
- /* adjust x coordinate for left/right mirroring */
- x = x - m;
- }
-
- /* compute which rows to draw */
- row = y-y0;
- r0 = y0 + (GLint) (row * ctx->Pixel.ZoomY);
- r1 = y0 + (GLint) ((row+1) * ctx->Pixel.ZoomY);
- if (r0==r1) {
- return;
- }
- else if (r1<r0) {
- GLint rtmp = r1;
- r1 = r0;
- r0 = rtmp;
- }
-
- /* return early if r0...r1 is above or below window */
- if (r0<0 && r1<0) {
- /* below window */
- return;
- }
- if (r0>=ctx->DrawBuffer->Height && r1>=ctx->DrawBuffer->Height) {
- /* above window */
- return;
- }
-
- /* check if left edge is outside window */
- skipcol = 0;
- if (x<0) {
- skipcol = -x;
- m += x;
- }
- /* make sure span isn't too long or short */
- if (m>maxwidth) {
- m = maxwidth;
- }
- else if (m<=0) {
- return;
- }
-
- ASSERT( m <= MAX_WIDTH );
-
- /* zoom the span horizontally */
- if (ctx->Pixel.ZoomX==-1.0F) {
- /* n==m */
- for (j=0;j<m;j++) {
- i = n - (j+skipcol) - 1;
- zoomed.color.rgba[j][0] = rgb[i][0];
- zoomed.color.rgba[j][1] = rgb[i][1];
- zoomed.color.rgba[j][2] = rgb[i][2];
- zoomed.color.rgba[j][3] = CHAN_MAX;
- zoomed.zArray[j] = z[i];