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thechaingamer
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ada-git-code

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Set_X_Y(2 + x*4, Y_range'Last - y*4);
when 5 =>
Set_X_Y( x*2, Y_range'Last - 2 - y*4);
when 6 =>
Set_X_Y(1 + x*2, Y_range'Last - y*2);
when 7 =>
null; -- nothing to to, pixel are contiguous
end case;
end if;
else
x:= X_range'First; -- New row
if y < y_max then
y:= y + 1;
curr_row:= 1-curr_row; -- swap row index for filtering
if not interlaced then
Feedback((y*100)/image.height);
end if;
elsif interlaced then -- last row has beed displayed
while pass < 7 loop
pass:= pass + 1;
y:= 0;
case pass is
when 1 =>
null;
when 2 =>
xm:= (image.width+3)/8 - 1;
ym:= (image.height+7)/8 - 1;
when 3 =>
xm:= (image.width+3)/4 - 1;
ym:= (image.height+3)/8 - 1;
when 4 =>
xm:= (image.width+1)/4 - 1;
ym:= (image.height+3)/4 - 1;
when 5 =>
xm:= (image.width+1)/2 - 1;
ym:= (image.height+1)/4 - 1;
when 6 =>
xm:= (image.width )/2 - 1;
ym:= (image.height+1)/2 - 1;
when 7 =>
xm:= image.width - 1;
ym:= image.height/2 - 1;
end case;
if xm >=0 and xm <= X_range'Last and ym in Y_range then
-- This pass is not empty (otherwise, we will continue
-- to the next one, if any).
x_max:= xm;
y_max:= ym;
exit;
end if;
end loop;
end if;
end if;
end Inc_XY;
uf: Byte_array(0..15); -- unfiltered bytes for a pixel
w1, w2: U16;
i: Integer;
begin
if some_trace then
Ada.Text_IO.Put("[UO]");
end if;
-- Depending on the row size, bpp, etc., we can have
-- several rows, or less than one, being displayed
-- with the present uncompressed data batch.
--
i:= data'First;
if i > data'Last then
reject:= 0;
return; -- data is empty, do nothing
end if;
--
-- Main loop over data
--
loop
if x = X_range'First then -- pseudo-column for filter method
exit when i > data'Last;
begin
current_filter:= Filter_method_0'Val(data(i));
if some_trace then
filter_stat(current_filter):= filter_stat(current_filter) + 1;
end if;
exception
when Constraint_Error =>
Raise_Exception(
error_in_image_data'Identity,
"PNG: wrong filter code, row #" &
Integer'Image(y) & " code:" & U8'Image(data(i))
);
Function Definition: procedure Jump_IDAT is
Function Body: dummy: U32;
begin
Big_endian(image.buffer, dummy); -- ending chunk's CRC
-- New chunk begins here.
loop
Read(image, ch);
exit when ch.kind /= IDAT or ch.length > 0;
end loop;