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--
procedure Output_uncompressed(
data : in Byte_array;
reject: out Natural
-- amount of bytes to be resent here next time,
-- in order to have a full multi-byte pixel
)
is
-- Display of pixels coded on 8 bits per channel in the PNG stream
procedure Out_Pixel_8(br, bg, bb, ba: U8) is
pragma Inline(Out_Pixel_8);
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;
begin
case Primary_color_range'Modulus is
when 256 =>
Put_Pixel(
Primary_color_range(br),
Primary_color_range(bg),
Primary_color_range(bb),
Primary_color_range(ba)
);
when 65_536 =>
Put_Pixel(
Times_257(Primary_color_range(br)),
Times_257(Primary_color_range(bg)),
Times_257(Primary_color_range(bb)),
Times_257(Primary_color_range(ba))
-- Times_257 makes max intensity FF go to FFFF
);
when others =>
raise invalid_primary_color_range;
end case;
end Out_Pixel_8;
procedure Out_Pixel_Palette(ix: U8) is
pragma Inline(Out_Pixel_Palette);
color_idx: constant Natural:= Integer(ix);
begin
Out_Pixel_8(
image.palette(color_idx).red,
image.palette(color_idx).green,
image.palette(color_idx).blue,
255
);
end Out_Pixel_Palette;
-- Display of pixels coded on 16 bits per channel in the PNG stream
procedure Out_Pixel_16(br, bg, bb, ba: U16) is
pragma Inline(Out_Pixel_16);
begin
case Primary_color_range'Modulus is
when 256 =>
Put_Pixel(
Primary_color_range(br / 256),
Primary_color_range(bg / 256),
Primary_color_range(bb / 256),
Primary_color_range(ba / 256)
);
when 65_536 =>
Put_Pixel(
Primary_color_range(br),
Primary_color_range(bg),
Primary_color_range(bb),
Primary_color_range(ba)
);
when others =>
raise invalid_primary_color_range;
end case;
end Out_Pixel_16;
procedure Inc_XY is
pragma Inline(Inc_XY);
xm, ym: Integer;
begin
if x < x_max then
x:= x + 1;
if interlaced then
-- Position of pixels depending on pass:
--
-- 1 6 4 6 2 6 4 6
-- 7 7 7 7 7 7 7 7
-- 5 6 5 6 5 6 5 6
-- 7 7 7 7 7 7 7 7
-- 3 6 4 6 3 6 4 6
-- 7 7 7 7 7 7 7 7
-- 5 6 5 6 5 6 5 6
-- 7 7 7 7 7 7 7 7
case pass is
when 1 =>
Set_X_Y( x*8, Y_range'Last - y*8);
when 2 =>
Set_X_Y(4 + x*8, Y_range'Last - y*8);
when 3 =>
Set_X_Y( x*4, Y_range'Last - 4 - y*8);
when 4 =>