mesa: Replace _mesa_unpack_bitmap with _mesa_unpack_image()

_mesa_unpack_bitmap() was introduced by commit 02b801c to handle the case
when data is stored in PBO by display lists, in the context of this bug:

Incorrect pixels read back if draw bitmap texture through Display list
https://bugs.freedesktop.org/show_bug.cgi?id=10370

Since _mesa_unpack_image() already handles the case of GL_BITMAP, this patch
removes _mesa_unpack_bitmap() and makes affected calls go through
_mesa_unapck_image() instead.

The sample test attached to the original bug report passes with this change
and there are no piglit regressions.

Signed-off-by: Eduardo Lima Mitev <elima@igalia.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>

3 files changed, 6 insertions, 117 deletions

diff --git a/src/mesa/main/dlist.c b/src/mesa/main/dlist.c
index d297f512052..06a038a2eb0 100644
--- a/src/mesa/main/dlist.c
+++ b/src/mesa/main/dlist.c
@@ -957,11 +957,8 @@ unpack_image(struct gl_context *ctx, GLuint dimensions,
       /* no PBO */
       GLvoid *image;
 
-      if (type == GL_BITMAP)
-         image = _mesa_unpack_bitmap(width, height, pixels, unpack);
-      else
-         image = _mesa_unpack_image(dimensions, width, height, depth,
-                                    format, type, pixels, unpack);
+      image = _mesa_unpack_image(dimensions, width, height, depth,
+                                 format, type, pixels, unpack);
       if (pixels && !image) {
          _mesa_error(ctx, GL_OUT_OF_MEMORY, "display list construction");
       }
@@ -983,11 +980,8 @@ unpack_image(struct gl_context *ctx, GLuint dimensions,
       }
 
       src = ADD_POINTERS(map, pixels);
-      if (type == GL_BITMAP)
-         image = _mesa_unpack_bitmap(width, height, src, unpack);
-      else
-         image = _mesa_unpack_image(dimensions, width, height, depth,
-                                    format, type, src, unpack);
+      image = _mesa_unpack_image(dimensions, width, height, depth,
+                                 format, type, src, unpack);
 
       ctx->Driver.UnmapBuffer(ctx, unpack->BufferObj, MAP_INTERNAL);
 
diff --git a/src/mesa/main/pack.c b/src/mesa/main/pack.c
index a64535210b2..90c7af9fe0d 100644
--- a/src/mesa/main/pack.c
+++ b/src/mesa/main/pack.c
@@ -100,7 +100,8 @@ void
 _mesa_unpack_polygon_stipple( const GLubyte *pattern, GLuint dest[32],
                               const struct gl_pixelstore_attrib *unpacking )
 {
-   GLubyte *ptrn = (GLubyte *) _mesa_unpack_bitmap(32, 32, pattern, unpacking);
+   GLubyte *ptrn = (GLubyte *) _mesa_unpack_image(2, 32, 32, 1, GL_COLOR_INDEX,
+                                                  GL_BITMAP, pattern, unpacking);
    if (ptrn) {
       /* Convert pattern from GLubytes to GLuints and handle big/little
        * endian differences
@@ -144,108 +145,6 @@ _mesa_pack_polygon_stipple( const GLuint pattern[32], GLubyte *dest,
 
 
 /*
- * Unpack bitmap data.  Resulting data will be in most-significant-bit-first
- * order with row alignment = 1 byte.
- */
-GLvoid *
-_mesa_unpack_bitmap( GLint width, GLint height, const GLubyte *pixels,
-                     const struct gl_pixelstore_attrib *packing )
-{
-   GLint bytes, row, width_in_bytes;
-   GLubyte *buffer, *dst;
-
-   if (!pixels)
-      return NULL;
-
-   /* Alloc dest storage */
-   bytes = ((width + 7) / 8 * height);
-   buffer = malloc( bytes );
-   if (!buffer)
-      return NULL;
-
-   width_in_bytes = CEILING( width, 8 );
-   dst = buffer;
-   for (row = 0; row < height; row++) {
-      const GLubyte *src = (const GLubyte *)
-         _mesa_image_address2d(packing, pixels, width, height,
-                               GL_COLOR_INDEX, GL_BITMAP, row, 0);
-      if (!src) {
-         free(buffer);
-         return NULL;
-      }
-
-      if ((packing->SkipPixels & 7) == 0) {
-         memcpy( dst, src, width_in_bytes );
-         if (packing->LsbFirst) {
-            flip_bytes( dst, width_in_bytes );
-         }
-      }
-      else {
-         /* handling SkipPixels is a bit tricky (no pun intended!) */
-         GLint i;
-         if (packing->LsbFirst) {
-            GLubyte srcMask = 1 << (packing->SkipPixels & 0x7);
-            GLubyte dstMask = 128;
-            const GLubyte *s = src;
-            GLubyte *d = dst;
-            *d = 0;
-            for (i = 0; i < width; i++) {
-               if (*s & srcMask) {
-                  *d |= dstMask;
-               }
-               if (srcMask == 128) {
-                  srcMask = 1;
-                  s++;
-               }
-               else {
-                  srcMask = srcMask << 1;
-               }
-               if (dstMask == 1) {
-                  dstMask = 128;
-                  d++;
-                  *d = 0;
-               }
-               else {
-                  dstMask = dstMask >> 1;
-               }
-            }
-         }
-         else {
-            GLubyte srcMask = 128 >> (packing->SkipPixels & 0x7);
-            GLubyte dstMask = 128;
-            const GLubyte *s = src;
-            GLubyte *d = dst;
-            *d = 0;
-            for (i = 0; i < width; i++) {
-               if (*s & srcMask) {
-                  *d |= dstMask;
-               }
-               if (srcMask == 1) {
-                  srcMask = 128;
-                  s++;
-               }
-               else {
-                  srcMask = srcMask >> 1;
-               }
-               if (dstMask == 1) {
-                  dstMask = 128;
-                  d++;
-                  *d = 0;
-               }
-               else {
-                  dstMask = dstMask >> 1;
-               }
-            }
-         }
-      }
-      dst += width_in_bytes;
-   }
-
-   return buffer;
-}
-
-
-/*
  * Pack bitmap data.
  */
 void
diff --git a/src/mesa/main/pack.h b/src/mesa/main/pack.h
index ddba82eea54..198368fcc83 100644
--- a/src/mesa/main/pack.h
+++ b/src/mesa/main/pack.h
@@ -41,10 +41,6 @@ _mesa_pack_polygon_stipple(const GLuint pattern[32], GLubyte *dest,
                            const struct gl_pixelstore_attrib *packing);
 
 
-extern GLvoid *
-_mesa_unpack_bitmap(GLint width, GLint height, const GLubyte *pixels,
-                    const struct gl_pixelstore_attrib *packing);
-
 extern void
 _mesa_pack_bitmap(GLint width, GLint height, const GLubyte *source,
                   GLubyte *dest, const struct gl_pixelstore_attrib *packing);