added alternate glBitmap code (disabled)

src/mesa/swrast/s_bitmap.c

-/* $Id: s_bitmap.c,v 1.14 2002/02/02 17:24:11 brianp Exp $ */
+/* $Id: s_bitmap.c,v 1.15 2002/02/15 03:41:00 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
+/**
+ * \file swrast/s_bitmap.c
+ * \brief glBitmap rendering.
+ * \author Brian Paul
+ */
 
 #include "glheader.h"
 #include "image.h"
 
    RENDER_FINISH(swrast,ctx);
 }
+
+
+#if 0
+/*
+ * XXX this is another way to implement Bitmap.  Use horizontal runs of
+ * fragments, initializing the mask array to indicate which fragmens to
+ * draw or skip.
+ */
+
+void
+_swrast_Bitmap( GLcontext *ctx, GLint px, GLint py,
+		GLsizei width, GLsizei height,
+		const struct gl_pixelstore_attrib *unpack,
+		const GLubyte *bitmap )
+{
+   SWcontext *swrast = SWRAST_CONTEXT(ctx);
+   GLint row, col;
+   struct sw_span span;
+
+   ASSERT(ctx->RenderMode == GL_RENDER);
+   ASSERT(bitmap);
+
+   RENDER_START(swrast,ctx);
+
+   if (SWRAST_CONTEXT(ctx)->NewState)
+      _swrast_validate_derived( ctx );
+
+   INIT_SPAN(span);
+   span.arrayMask |= SPAN_MASK;  /* we'll init span.mask[] */
+   span.x = px;
+   span.y = py;
+   span.end = width;
+   if (ctx->Visual.rgbMode) {
+      span.interpMask |= SPAN_RGBA;
+      span.red   = FloatToFixed(ctx->Current.RasterColor[0] * CHAN_MAXF);
+      span.green = FloatToFixed(ctx->Current.RasterColor[1] * CHAN_MAXF);
+      span.blue  = FloatToFixed(ctx->Current.RasterColor[2] * CHAN_MAXF);
+      span.alpha = FloatToFixed(ctx->Current.RasterColor[3] * CHAN_MAXF);
+      span.redStep = span.greenStep = span.blueStep = span.alphaStep = 0;
+   }
+   else {
+      span.interpMask |= SPAN_INDEX;
+      span.index = ChanToFixed(ctx->Current.RasterIndex);
+      span.indexStep = 0;
+   }
+
+   if (ctx->Depth.Test)
+      _mesa_span_default_z(ctx, &span);
+   if (ctx->Fog.Enabled)
+      _mesa_span_default_fog(ctx, &span);
+
+   for (row=0; row<height; row++, span.y++) {
+      const GLubyte *src = (const GLubyte *) _mesa_image_address( unpack,
+                 bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, 0, row, 0 );
+
+      if (unpack->LsbFirst) {
+         /* Lsb first */
+         GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
+         for (col=0; col<width; col++) {
+            span.mask[col] = (*src & mask) ? GL_TRUE : GL_FALSE;
+            if (mask == 128U) {
+               src++;
+               mask = 1U;
+            }
+            else {
+               mask = mask << 1;
+            }
+         }
+
+         if (ctx->Visual.rgbMode)
+            _mesa_write_rgba_span(ctx, &span, GL_BITMAP);
+         else
+            _mesa_write_index_span(ctx, &span, GL_BITMAP);
+
+         /* get ready for next row */
+         if (mask != 1)
+            src++;
+      }
+      else {
+         /* Msb first */
+         GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
+         for (col=0; col<width; col++) {
+            span.mask[col] = (*src & mask) ? GL_TRUE : GL_FALSE;
+            if (mask == 1U) {
+               src++;
+               mask = 128U;
+            }
+            else {
+               mask = mask >> 1;
+            }
+         }
+
+         if (ctx->Visual.rgbMode)
+            _mesa_write_rgba_span(ctx, &span, GL_BITMAP);
+         else
+            _mesa_write_index_span(ctx, &span, GL_BITMAP);
+
+         /* get ready for next row */
+         if (mask != 128)
+            src++;
+      }
+   }
+
+   RENDER_FINISH(swrast,ctx);
+}
+#endif