mesa: Add helpers to extract GL_COLOR_INDEX to RGBA float/ubyte

We only use _mesa_make_temp_ubyte_image in texstore.c to convert
GL_COLOR_INDEX to RGBA, but this helper does more stuff than this.
All uses of this helper can be replaced with calls to
_mesa_format_convert except for this GL_COLOR_INDEX conversion.

This patch extracts the GL_COLOR_INDEX to RGBA logic to a separate
helper so we can use that instead from texstore.c.

In future patches we will replace all remaining calls to
_mesa_make_temp_ubyte_image in the repository (related to compressed
formats) with calls to _mesa_format_convert so we can remove
_mesa_make_temp_ubyte_image and related functions.

v2:
- Remove ‘for’ loop initial declaration. They are only allowed in C99 or C11
mode.

Reviewed-by: Jason Ekstrand <[email protected]>

1 files changed, 14 insertions, 0 deletions

diff --git a/src/mesa/main/pack.h b/src/mesa/main/pack.h
index 9988bea4fd1..ddba82eea54 100644
--- a/src/mesa/main/pack.h
+++ b/src/mesa/main/pack.h
@@ -165,4 +165,18 @@ _mesa_pack_luminance_from_rgba_integer(GLuint n, GLuint rgba[][4], bool rgba_is_
                                        GLvoid *dstAddr, GLenum dst_format,
                                        GLenum dst_type);
 
+extern GLfloat *
+_mesa_unpack_color_index_to_rgba_float(struct gl_context *ctx, GLuint dims,
+                                       const void *src, GLenum srcFormat, GLenum srcType,
+                                       int srcWidth, int srcHeight, int srcDepth,
+                                       const struct gl_pixelstore_attrib *srcPacking,
+                                       GLbitfield transferOps);
+
+extern GLubyte *
+_mesa_unpack_color_index_to_rgba_ubyte(struct gl_context *ctx, GLuint dims,
+                                       const void *src, GLenum srcFormat, GLenum srcType,
+                                       int srcWidth, int srcHeight, int srcDepth,
+                                       const struct gl_pixelstore_attrib *srcPacking,
+                                       GLbitfield transferOps);
+
 #endif