FaRTy1billion: Added File Formats category

2023-06-01T18:22:55Z

Added File Formats category

Zurg: formatting, fix cat typo

2015-08-02T04:40:48Z

formatting, fix cat typo

DevliN: 1 revision imported: Restoring SC1 backup

2015-03-21T04:40:31Z

1 revision imported: Restoring SC1 backup

DevliN: Created page with 'Byte = 8 bits Word = 2 bytes (Short) Long = 4 bytes All values are unsigned. ==GRP File Layout== GRP Header Image Header * number of images Line Offsets number of image…'

2012-11-24T20:12:48Z

Created page with '*Byte = 8 bits *Word = 2 bytes (Short) *Long = 4 bytes *All values are unsigned. ==GRP File Layout== *GRP Header *Image Header * number of images *Line Offsets * number of image…'

New page

*Byte = 8 bits
*Word = 2 bytes (Short)
*Long = 4 bytes
*All values are unsigned.

==GRP File Layout==
*GRP Header
*Image Header * number of images
*Line Offsets * number of images * image height
*RLE Line * number of images * image height

===GRP Header===
Struct Size: 6 bytes
*Word - number of images
*Word - maximum width
*Word - maximum height
*Image Headers - one header for each image

===Image Header===
Struct Size: 8 bytes
*Byte - difference from maximum width (?)
*Byte - difference from maximum height (?)
*Byte - width (in pixels)
*Byte - height (in pixels)
*Long - offset to Line Offsets: the number of bytes from the beginning of the file to the offset for each line.

===Line Offsets===
Struct Size: 2 bytes * image height
*Word - offset to a RLE Line in bytes from the location of this Line Offsets.
*Word - another offset...
*Word - another...
*Word - another...
*...

===RLE Line===
*Byte - Instruction and length:
**if bit 7 is on, it indicates X number pixels are skipped aka transparency.
**if bit 6 is 1 indicates X number of pixels are "this" color. (RLE compression part)
**else X normal pixels should be copied over.

eh... i got lazy, sorry. :/

===Example Code===
struct definitions
struct grp_image_s
{
uint8_t x_offset;
uint8_t y_offset;
uint8_t width;
uint8_t height;
uint32_t offsets;
};

struct grp_header_s
{
uint16_t num_images;
uint16_t max_width;
uint16_t max_height;
};

struct color_s
{
uint8_t red;
uint8_t green;
uint8_t blue;
uint8_t alpha;
};

read the whole file into sprite_data
uint8_t sprite_data = new uint8_t[file_size_in_bytes];

allocate a color_s for each pixel (for just one image)
grp_header_s* gr_file_header = (grp_header_s*)sprite_data;
color_s* pixels = new color_s[grp_file_header->max_width *
grp_header->max_height ];

decoding algo
for (k = 0; k < num_images; ++k)
{
current_image = (grp_image_s*)(sprite_data + 6 + (k * sizeof(grp_image_s)));
line_offsets = (uint16_t*)(sprite_data + current_image->offsets);

image_width = current_image->width;
image_height = current_image->height;

memset(pixels, 0, grp_header->size_x * grp_header->size_y * sizeof(color_s));

for (y = 0; y < image_height; ++y)
{
line_data = (uint8_t*)line_offsets + line_offsets[y];
line_pixels = pixels + (image_width * y);
for (data_offset = x = 0; x < image_width;)
{
if (line_data[data_offset] & 0x80) // transparent
{x += line_data[data_offset++] & 0x7f;}
else if (line_data[data_offset] & 0x40) // data run
{
length = x + (line_data[data_offset++] & 0x3f);
rle_index = line_data[data_offset++];
while (x < length) {line_pixels[x++] = palette[rle_index];}
}
else // normal
{
for (length = x + line_data[data_offset++]; x < length;)
{line_pixels[x++] = palette[line_data[data_offset++]];}
}
}
}

COPY pixels TO ANOTHER PLACE
}

[[Category:StarCraft]]
[[Category:Referencw]]
[[Category:Modding]]

← Older revision		Revision as of 18:22, 1 June 2023
Line 114:		Line 114:
	[[Category:Reference]]		[[Category:Reference]]
	[[Category:Modding]]		[[Category:Modding]]
		+	[[Category:File Formats]]

@@ Line 2: / Line 2: @@
 *Word = 2 bytes (Short)
 *Long = 4 bytes
-*All values are unsigned.
+*All values are unsigned.<br/><br/>
 ==GRP File Layout==
 *GRP Header
@@ Line 113: / Line 112: @@
 [[Category:StarCraft]]
-[[Category:Referencw]]
+[[Category:Reference]]
 [[Category:Modding]]

← Older revision	Revision as of 04:40, 21 March 2015
(No difference)

GRP Image Format - Revision history

FaRTy1billion: Added File Formats category

Zurg: formatting, fix cat typo

DevliN: 1 revision imported: Restoring SC1 backup

DevliN: Created page with '*Byte = 8 bits *Word = 2 bytes (Short) *Long = 4 bytes *All values are unsigned. ==GRP File Layout== *GRP Header *Image Header * number of images *Line Offsets * number of image…'

DevliN: Created page with 'Byte = 8 bits Word = 2 bytes (Short) Long = 4 bytes All values are unsigned. ==GRP File Layout== GRP Header Image Header * number of images Line Offsets number of image…'