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generic
-- Parameter(s) that are constant through
-- the whole image. Macro-expanded generics and
-- some optimization will trim corresponding "if's"
interlaced : Boolean;
transparency : Boolean;
pixel_mask : U32;
--
procedure GIF_Decode;
procedure GIF_Decode is
procedure Pixel_with_palette(b: U8) is
pragma Inline(Pixel_with_palette);
function Times_257(x: Primary_color_range) return Primary_color_range is
pragma Inline(Times_257);
begin
return 16 * (16 * x) + x; -- this is 257 * x, = 16#0101# * x
-- Numbers 8-bit -> no OA warning at instanciation. Returns x if type Primary_color_range is mod 2**8.
end Times_257;
full_opaque: constant Primary_color_range:= Primary_color_range'Last;
begin
if transparency and then b = Transp_color then
Put_Pixel(0,0,0, 0);
return;
end if;
case Primary_color_range'Modulus is
when 256 =>
Put_Pixel(
Primary_color_range(local.palette(Integer(b)).red),
Primary_color_range(local.palette(Integer(b)).green),
Primary_color_range(local.palette(Integer(b)).blue),
full_opaque
);
when 65_536 =>
Put_Pixel(
Times_257(Primary_color_range(local.palette(Integer(b)).red)),
Times_257(Primary_color_range(local.palette(Integer(b)).green)),
Times_257(Primary_color_range(local.palette(Integer(b)).blue)),
-- Times_257 makes max intensity FF go to FFFF
full_opaque
);
when others =>
raise invalid_primary_color_range;
end case;
end Pixel_with_palette;
-- Interlacing
Interlace_pass : Natural range 1..4:= 1;
Span : Natural:= 7;
-- Local procedure to draw a pixel
procedure Next_Pixel(code: Natural) is
pragma Inline(Next_Pixel);
c : constant Color_type:= Color_type(U32(code) and pixel_mask);
begin
-- Actually draw the pixel on screen buffer
if X < image.width then
if interlaced and mode = nice then
for i in reverse 0..Span loop
if Y+i < image.height then
Set_X_Y(X, image.height - (Y+i) - 1);
Pixel_with_palette(c);
end if;
end loop;
elsif Y < image.height then
Pixel_with_palette(c);
end if;
end if;
-- Move on to next pixel
X:= X + 1;
-- Or next row, if necessary
if X = brX then
X:= tlX;
if interlaced then
case Interlace_pass is
when 1 =>
Y:= Y + 8;
if Y >= brY then
Y:= 4;
Interlace_pass:= 2;
Span:= 3;
Feedback((Interlace_pass*100)/4);
end if;
when 2 =>
Y:= Y + 8;
if Y >= brY then
Y:= 2;
Interlace_pass:= 3;
Span:= 1;
Feedback((Interlace_pass*100)/4);
end if;
when 3 =>
Y:= Y + 4;
if Y >= brY then
Y:= 1;
Interlace_pass:= 4;