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-- getGray
-- Gets the grayscale image data. Used as an alpha channel.
-- =============
procedure getGray (buffer : out Byte_Array) is
begin
if RLE then
for b in buffer'Range loop
RLE_Pixel (8, buffer (b .. b));
end loop;
else
for b in buffer'Range loop
Get_Byte (stream_buf, buffer (b));
end loop;
end if;
the_Image.tex_Format := GL.LUMINANCE; -- ALPHA
the_Image.tex_pixel_Format := GL.LUMINANCE;
end getGray;
-- =============
-- getData
-- Gets the image data for the specified bit depth.
-- =============
procedure getData (iBits : Integer; buffer : out Byte_Array) is
begin
Attach_Stream (stream_buf, S);
case iBits is
when 32 =>
getRGBA (buffer);
the_Image.blending_hint := True;
when 24 =>
getRGB (buffer);
the_Image.blending_hint := False;
when 8 =>
getGray (buffer);
the_Image.blending_hint := True;
when others => null;
end case;
end getData;
TGA_type : Byte_Array (0 .. 3);
info : Byte_Array (0 .. 5);
dummy : Byte_Array (1 .. 8);
Image_Bits : Integer;
Image_Type : Integer;
begin -- to_TGA_Image
Byte_Array'Read (S, TGA_type); -- read in colormap info and image type
Byte_Array'Read (S, dummy); -- seek past the header and useless info
Byte_Array'Read (S, info);
if TGA_type (1) /= GL.Ubyte'Val (0) then
Raise_Exception (
TGA_Unsupported_Image_Type'Identity,
"TGA : palette not supported, please use BMP"
);
end if;
-- Image type:
-- 1=8 - bit palette style
-- 2=Direct [A]RGB image
-- 3=grayscale
-- 9=RLE version of Type 1
-- 10=RLE version of Type 2
-- 11=RLE version of Type 3
Image_Type := GL.Ubyte'Pos (TGA_type (2));
RLE := Image_Type >= 9;
if RLE then
Image_Type := Image_Type - 8;
RLE_pixels_remaining := 0;
end if;
if Image_Type /= 2 and then Image_Type /= 3 then
Raise_Exception (
TGA_Unsupported_Image_Type'Identity,
"TGA type =" & Integer'Image (Image_Type)
);
end if;
the_Image.Width := GL.Ubyte'Pos (info (0)) + GL.Ubyte'Pos (info (1)) * 256;
the_Image.Height := GL.Ubyte'Pos (info (2)) + GL.Ubyte'Pos (info (3)) * 256;
Image_Bits := GL.Ubyte'Pos (info (4));
the_Image.size := the_Image.Width * the_Image.Height;
-- 30 - Apr - 2006 : dimensions not power of two allowed, but discouraged in the docs.
--
-- -- make sure dimension is a power of 2
-- if not (checkSize (imageWidth) and checkSize (imageHeight)) then
-- raise TGA_BAD_DIMENSION;
-- end if;
-- make sure we are loading a supported TGA_type
if Image_Bits /= 32 and then Image_Bits /= 24 and then Image_Bits /= 8 then
raise TGA_Unsupported_Bits_per_pixel;
end if;