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netsurf/image/bmpread.c
Daniel Silverstone 6807b4208a Remove the netsurf/ from the include paths and rationalise use of <> vs "" in includes 
NetSurf includes are now done with ""s and other system includes with <>s as C intended.
The scandeps tool has been updated to only look for ""ed includes, and to verify that the
files exist in the tree before adding them to the dependency lines. The depend rule has
therefore been augmented to make sure the autogenerated files are built before it is run.

This is untested under self-hosted RISC OS builds. All else tested and works.


svn path=/trunk/netsurf/; revision=3307
2007-05-30 22:39:54 +00:00

793 lines
21 KiB
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/*
* This file is part of NetSurf, http://netsurf-browser.org/
* Licensed under the GNU General Public License,
* http://www.opensource.org/licenses/gpl-license
* Copyright 2006 Richard Wilson <info@tinct.net>
*/
#include <assert.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "image/bmpread.h"
#include "image/bitmap.h"
#include "utils/log.h"
#define READ_SHORT(a, o) (a[o]|(a[o+1]<<8))
#define READ_INT(a, o) (a[o]|(a[o+1]<<8)|(a[o+2]<<16)|(a[o+3]<<24))
bmp_result bmp_analyse_header(struct bmp_image *bmp, char *data);
bmp_result bmp_decode_rgb24(struct bmp_image *bmp, char **start, int bytes);
bmp_result bmp_decode_rgb16(struct bmp_image *bmp, char **start, int bytes);
bmp_result bmp_decode_rgb(struct bmp_image *bmp, char **start, int bytes);
bmp_result bmp_decode_mask(struct bmp_image *bmp, char *data, int bytes);
bmp_result bmp_decode_rle(struct bmp_image *bmp, char *data, int bytes, int size);
void bmp_invalidate(struct bitmap *bitmap, void *private_word);
/**
* Analyse a BMP prior to decoding.
*
* This function will scan the data provided and perform simple checks to
* ensure the data is a valid BMP.
*
* This function must be called before bmp_decode() and sets up all the
* relevant values in the bmp structure.
*
* \param bmp the BMP image to analyse
* \return BMP_OK on success
*/
bmp_result bmp_analyse(struct bmp_image *bmp) {
char *data = bmp->bmp_data;
/* ensure we aren't already initialised */
if (bmp->bitmap)
return BMP_OK;
/* standard 14-byte BMP file header is:
*
* +0 SHORT 'BM'
* +2 INT size of file (in bytes)
* +6 SHORT reserved field (1)
* +8 SHORT reserved field (2)
* +10 INT starting position of image data (in bytes)
*/
if (bmp->buffer_size < 14)
return BMP_INSUFFICIENT_DATA;
if ((data[0] != 'B') || (data[1] != 'M'))
return BMP_DATA_ERROR;
bmp->bitmap_offset = READ_INT(data, 10);
/* decode the BMP header */
return bmp_analyse_header(bmp, data + 14);
}
/**
* Analyse an ICO prior to decoding.
*
* This function will scan the data provided and perform simple checks to
* ensure the data is a valid ICO.
*
* This function must be called before ico_find().
*
* \param ico the ICO image to analyse
* \return BMP_OK on success
*/
bmp_result ico_analyse(struct ico_collection *ico) {
char *data = ico->ico_data;
unsigned int count, i;
bmp_result result;
struct ico_image *image;
int area, max_area = 0;
/* ensure we aren't already initialised */
if (ico->first)
return BMP_OK;
/* standard 6-byte ICO file header is:
*
* +0 INT 0x00010000
* +4 SHORT number of BMPs to follow
*/
if (ico->buffer_size < 6)
return BMP_INSUFFICIENT_DATA;
if (READ_INT(data, 0) != 0x00010000)
return BMP_DATA_ERROR;
count = READ_SHORT(data, 4);
if (count == 0)
return BMP_DATA_ERROR;
data += 6;
/* decode the BMP files */
if (ico->buffer_size < 6 + (16 * count))
return BMP_INSUFFICIENT_DATA;
for (i = 0; i < count; i++) {
image = calloc(1, sizeof(struct ico_image));
if (!image)
return BMP_INSUFFICIENT_MEMORY;
image->next = ico->first;
ico->first = image;
image->bmp.width = data[0];
image->bmp.height = data[1];
image->bmp.buffer_size = READ_INT(data, 8) + 40;
image->bmp.bmp_data = ico->ico_data + READ_INT(data, 12);
image->bmp.ico = true;
data += 16;
result = bmp_analyse_header(&image->bmp, image->bmp.bmp_data);
if (result != BMP_OK)
return result;
area = image->bmp.width * image->bmp.height;
if (area > max_area) {
ico->width = image->bmp.width;
ico->height = image->bmp.height;
max_area = area;
}
}
return BMP_OK;
}
bmp_result bmp_analyse_header(struct bmp_image *bmp, char *data) {
unsigned int header_size;
unsigned int i;
int width, height, j;
int palette_size;
unsigned int flags;
/* a variety of different bitmap headers can follow, depending
* on the BMP variant. A full description of the various headers
* can be found at http://www.fileformat.info/format/bmp/
*/
header_size = READ_INT(data, 0);
if (bmp->buffer_size < (14 + header_size))
return BMP_INSUFFICIENT_DATA;
if (header_size == 12) {
/* the following header is for os/2 and windows 2.x and consists of:
*
* +0 INT size of this header (in bytes)
* +4 SHORT image<67>width<74>(in<69>pixels)
* +6 SHORT image<67>height<68>(in<69>pixels)
* +8 SHORT number<65>of<6F>color<6F>planes<65>(always 1)
* +10 SHORT number<65>of<6F>bits<74>per<65>pixel
*/
width = READ_SHORT(data, 4);
height = READ_SHORT(data, 6);
if (width < 0)
return BMP_DATA_ERROR;
if (height < 0) {
bmp->reversed = true;
height = -height;
}
bmp->width = width;
bmp->height = height;
if (READ_SHORT(data, 8) != 1)
return BMP_DATA_ERROR;
bmp->bpp = READ_SHORT(data, 10);
bmp->colours = (1 << bmp->bpp);
palette_size = 3;
} else if (header_size < 40) {
return BMP_DATA_ERROR;
} else {
/* the following header is for windows 3.x and onwards. it is a
* minimum of 40 bytes and (as of Windows 95) a maximum of 108 bytes.
*
* +0 INT size<7A>of<6F>this<69>header<65>(in<69>bytes)
* +4 INT image<67>width<74>(in<69>pixels)
* +8 INT image height<68>(in<69>pixels)
<EFBFBD> * +12 SHORT number<65>of<6F>color<6F>planes<65>(always 1)
* +14 SHORT number<65>of<6F>bits<74>per<65>pixel
* +16 INT compression<6F>methods<64>used
* +20 INT size<7A>of<6F>bitmap<61>(in<69>bytes)
* +24 INT horizontal<61>resolution<6F>(in<69>pixels<6C>per<65>meter)
* +28 INT vertical<61>resolution<6F>(in<69>pixels<6C>per<65>meter)
* +32 INT number<65>of<6F>colors<72>in<69>the<68>image
* +36 INT number<65>of<6F>important<6E>colors
* +40 INT mask<73>identifying<6E>bits<74>of<6F>red<65>component
* +44 INT mask<73>identifying<6E>bits<74>of<6F>green<65>component
* +48 INT mask<73>identifying<6E>bits<74>of<6F>blue<75>component
* +52 INT mask<73>identifying<6E>bits<74>of<6F>alpha<68>component
* +56 INT color<6F>space<63>type
* +60 INT x<>coordinate<74>of<6F>red<65>endpoint
* +64 INT y<>coordinate<74>of<6F>red<65>endpoint
* +68 INT z<>coordinate<74>of<6F>red<65>endpoint
* +72 INT x<>coordinate<74>of<6F>green<65>endpoint
* +76 INT y<>coordinate<74>of<6F>green<65>endpoint
* +80 INT z<>coordinate<74>of<6F>green<65>endpoint
* +84 INT x<>coordinate<74>of<6F>blue<75>endpoint
* +88 INT y<>coordinate<74>of<6F>blue<75>endpoint
* +92 INT z<>coordinate<74>of<6F>blue<75>endpoint
* +96 INT gamma<6D>red<65>coordinate<74>scale<6C>value
* +100 INT gamma<6D>green<65>coordinate<74>scale<6C>value
* +104 INT gamma<6D>blue<75>coordinate<74>scale<6C>value
*/
if (!bmp->ico) {
width = READ_INT(data, 4);
height = READ_INT(data, 8);
if (width < 0)
return BMP_DATA_ERROR;
if (height < 0) {
bmp->reversed = true;
height = -height;
}
bmp->width = width;
bmp->height = height;
}
if (READ_SHORT(data, 12) != 1)
return BMP_DATA_ERROR;
bmp->bpp = READ_SHORT(data, 14);
if (bmp->bpp == 0)
bmp->bpp = 8;
bmp->encoding = READ_INT(data, 16);
if (bmp->encoding > BMP_ENCODING_BITFIELDS)
return BMP_DATA_ERROR;
if (bmp->encoding == BMP_ENCODING_BITFIELDS) {
if ((bmp->bpp != 16) && (bmp->bpp != 32))
return BMP_DATA_ERROR;
if (header_size == 40) {
header_size += 12;
if (bmp->buffer_size < (14 + header_size))
return BMP_INSUFFICIENT_DATA;
for (i = 0; i < 3; i++)
bmp->mask[i] = READ_INT(data, 40 + (i << 2));
} else {
for (i = 0; i < 4; i++)
bmp->mask[i] = READ_INT(data, 40 + (i << 2));
}
for (i = 0; i < 4; i++) {
if (bmp->mask[i] == 0)
break;
for (j = 31; j > 0; j--)
if (bmp->mask[i] & (1 << j)) {
if ((j - 7) > 0)
bmp->mask[i] &= 0xff << (j - 7);
else
bmp->mask[i] &= 0xff >> (-(j - 7));
bmp->shift[i] = (i << 3) - (j - 7);
break;
}
}
}
bmp->colours = READ_INT(data, 32);
if (bmp->colours == 0)
bmp->colours = (1 << bmp->bpp);
palette_size = 4;
}
data += header_size;
/* we only have a palette for <16bpp */
if (bmp->bpp < 16) {
/* we now have a series of palette entries of the format:
*
* +0 BYTE blue
* +1 BYTE green
* +2 BYTE red
*
* if the palette is from an OS/2 or Win2.x file then the entries
* are padded with an extra byte.
*/
if (bmp->buffer_size < (14 + header_size + (4 * bmp->colours)))
return BMP_INSUFFICIENT_DATA;
bmp->colour_table = (unsigned int *)
malloc(bmp->colours * sizeof(int));
if (!bmp->colour_table)
return BMP_INSUFFICIENT_MEMORY;
for (i = 0; i < bmp->colours; i++) {
bmp->colour_table[i] = data[2] | (data[1] << 8) |
(data[0] << 16);
data += palette_size;
}
}
/* create our bitmap */
flags = BITMAP_NEW | BITMAP_CLEAR_MEMORY;
if ((!bmp->ico) && (bmp->mask[3] == 0))
flags |= BITMAP_OPAQUE;
bmp->bitmap = bitmap_create(bmp->width, bmp->height, flags);
if (!bmp->bitmap) {
if (bmp->colour_table)
free(bmp->colour_table);
bmp->colour_table = NULL;
return BMP_INSUFFICIENT_MEMORY;
}
bmp->bitmap_offset = (int)data - (int)bmp->bmp_data;
bitmap_set_suspendable(bmp->bitmap, bmp, bmp_invalidate);
return BMP_OK;
}
/*
* Finds the closest BMP within an ICO collection
*
* This function finds the BMP with dimensions as close to a specified set
* as possible from the images in the collection.
*
* \param ico the ICO collection to examine
* \param width the preferred width
* \param height the preferred height
*/
struct bmp_image *ico_find(struct ico_collection *ico, int width, int height) {
struct bmp_image *bmp = NULL;
struct ico_image *image;
int x, y, cur, distance = (1 << 24);
for (image = ico->first; image; image = image->next) {
if (((int)image->bmp.width == width) && ((int)image->bmp.height == height))
return &image->bmp;
x = image->bmp.width - width;
y = image->bmp.height - height;
cur = (x * x) + (y * y);
if (cur < distance) {
distance = cur;
bmp = &image->bmp;
}
}
return bmp;
}
/**
* Invalidates a BMP
*
* This function sets the BMP into a state such that the bitmap image data
* can be released from memory.
*
* \param bmp the BMP image to invalidate
*/
void bmp_invalidate(struct bitmap *bitmap, void *private_word) {
struct bmp_image *bmp = (struct bmp_image *)private_word;
bmp->decoded = false;
}
/**
* Decode a BMP
*
* This function decodes the BMP data such that bmp->bitmap is a valid
* image. The state of bmp->decoded is set to TRUE on exit such that it
* can easily be identified which BMPs are in a fully decoded state.
*
* \param bmp the BMP image to decode
* \return BMP_OK on success
*/
bmp_result bmp_decode(struct bmp_image *bmp) {
char *data;
int bytes;
bmp_result result = BMP_OK;
assert(bmp->bitmap);
data = bmp->bmp_data + bmp->bitmap_offset;
bytes = bmp->buffer_size - bmp->bitmap_offset;
switch (bmp->encoding) {
case BMP_ENCODING_RGB:
if (bmp->bpp >= 24)
result = bmp_decode_rgb24(bmp, &data, bytes);
else if (bmp->bpp > 8)
result = bmp_decode_rgb16(bmp, &data, bytes);
else
result = bmp_decode_rgb(bmp, &data, bytes);
break;
case BMP_ENCODING_RLE8:
result = bmp_decode_rle(bmp, data, bytes, 8);
break;
case BMP_ENCODING_RLE4:
result = bmp_decode_rle(bmp, data, bytes, 4);
break;
case BMP_ENCODING_BITFIELDS:
if (bmp->bpp == 32)
result = bmp_decode_rgb24(bmp, &data, bytes);
else if (bmp->bpp == 16)
result = bmp_decode_rgb16(bmp, &data, bytes);
else
return BMP_DATA_ERROR;
}
if ((!bmp->ico) || (result != BMP_OK))
return result;
bytes = (int)bmp->bmp_data + bmp->buffer_size - (int)data;
return bmp_decode_mask(bmp, data, bytes);
}
/**
* Decode BMP data stored in 24bpp colour.
*
* \param bmp the BMP image to decode
* \param start the data to decode, updated to last byte read on success
* \param bytes the number of bytes of data available
* \return BMP_OK on success
*/
bmp_result bmp_decode_rgb24(struct bmp_image *bmp, char **start, int bytes) {
char *top, *bottom, *end, *data;
unsigned int *scanline;
unsigned int x, y, swidth, skip;
unsigned int addr;
unsigned int i, word;
data = *start;
swidth = bitmap_get_rowstride(bmp->bitmap);
top = bitmap_get_buffer(bmp->bitmap);
bottom = top + swidth * (bmp->height - 1);
end = data + bytes;
addr = ((unsigned int)data) & 3;
skip = bmp->bpp >> 3;
bmp->decoded = true;
for (y = 0; y < bmp->height; y++) {
while (addr != (((unsigned int)data) & 3))
data++;
if ((data + (skip * bmp->width)) > end)
return BMP_INSUFFICIENT_DATA;
if (bmp->reversed)
scanline = (unsigned int *)(top + (y * swidth));
else
scanline = (unsigned int *)(bottom - (y * swidth));
if (bmp->encoding == BMP_ENCODING_BITFIELDS) {
for (x = 0; x < bmp->width; x++) {
word = data[0] | (data[1] << 8) | (data[2] << 16) |
(data[3] << 24);
scanline[x] = (0xff << 24);
for (i = 0; i < 4; i++)
if (bmp->shift[i] > 0)
scanline[x] ^= ((word & bmp->mask[i]) <<
bmp->shift[i]);
else
scanline[x] ^= ((word & bmp->mask[i]) >>
(-bmp->shift[i]));
data += 4;
}
} else {
for (x = 0; x < bmp->width; x++) {
scanline[x] = data[2] | (data[1] << 8) | (data[0] << 16) |
(data[3] << 24);
data += skip;
}
}
}
*start = data;
return BMP_OK;
}
/**
* Decode BMP data stored in 16bpp colour.
*
* \param bmp the BMP image to decode
* \param start the data to decode, updated to last byte read on success
* \param bytes the number of bytes of data available
* \return BMP_OK on success
*/
bmp_result bmp_decode_rgb16(struct bmp_image *bmp, char **start, int bytes) {
char *top, *bottom, *end, *data;
unsigned int *scanline;
unsigned int x, y, swidth;
unsigned int addr;
unsigned int word, i;
data = *start;
swidth = bitmap_get_rowstride(bmp->bitmap);
top = bitmap_get_buffer(bmp->bitmap);
bottom = top + swidth * (bmp->height - 1);
end = data + bytes;
addr = ((unsigned int)data) & 3;
bmp->decoded = true;
for (y = 0; y < bmp->height; y++) {
if (addr != (((unsigned int)data) & 3))
data += 2;
if ((data + (2 * bmp->width)) > end)
return BMP_INSUFFICIENT_DATA;
if (bmp->reversed)
scanline = (unsigned int *)(top + (y * swidth));
else
scanline = (unsigned int *)(bottom - (y * swidth));
if (bmp->encoding == BMP_ENCODING_BITFIELDS) {
for (x = 0; x < bmp->width; x++) {
word = data[0] | (data[1] << 8);
scanline[x] = (0xff << 24);
for (i = 0; i < 4; i++)
if (bmp->shift[i] > 0)
scanline[x] ^= ((word & bmp->mask[i]) <<
bmp->shift[i]);
else
scanline[x] ^= ((word & bmp->mask[i]) >>
(-bmp->shift[i]));
data += 2;
}
} else {
for (x = 0; x < bmp->width; x++) {
word = data[0] | (data[1] << 8);
scanline[x] = ((word & (31 << 0)) << 19) |
((word & (31 << 5)) << 6) |
((word & (31 << 10)) >> 7);
data += 2;
}
}
}
*start = data;
return BMP_OK;
}
/**
* Decode BMP data stored with a palette and in 8bpp colour or less.
*
* \param bmp the BMP image to decode
* \param start the data to decode, updated to last byte read on success
* \param bytes the number of bytes of data available
* \return BMP_OK on success
*/
bmp_result bmp_decode_rgb(struct bmp_image *bmp, char **start, int bytes) {
char *top, *bottom, *end, *data;
unsigned int *scanline;
unsigned int addr;
unsigned int x, y, swidth;
int i;
int bit_shifts[8];
int ppb = 8 / bmp->bpp;
int bit_mask = (1 << bmp->bpp) - 1;
int cur_byte = 0, bit;
for (i = 0; i < ppb; i++)
bit_shifts[i] = 8 - ((i + 1) * bmp->bpp);
data = *start;
swidth = bitmap_get_rowstride(bmp->bitmap);
top = bitmap_get_buffer(bmp->bitmap);
bottom = top + swidth * (bmp->height - 1);
end = data + bytes;
addr = ((unsigned int)data) & 3;
bmp->decoded = true;
for (y = 0; y < bmp->height; y++) {
while (addr != (((unsigned int)data) & 3))
data++;
bit = 32;
if ((data + (bmp->width / ppb)) > end)
return BMP_INSUFFICIENT_DATA;
if (bmp->reversed)
scanline = (unsigned int *)(top + (y * swidth));
else
scanline = (unsigned int *)(bottom - (y * swidth));
for (x = 0; x < bmp->width; x++) {
if (bit >= ppb) {
bit = 0;
cur_byte = *data++;
}
scanline[x] = bmp->colour_table[(cur_byte >>
bit_shifts[bit++]) & bit_mask];
}
}
*start = data;
return BMP_OK;
}
/**
* Decode a 1bpp mask for an ICO
*
* \param bmp the BMP image to decode
* \param data the data to decode
* \param bytes the number of bytes of data available
* \return BMP_OK on success
*/
bmp_result bmp_decode_mask(struct bmp_image *bmp, char *data, int bytes) {
char *top, *bottom, *end;
unsigned int *scanline;
unsigned int addr;
unsigned int x, y, swidth;
int cur_byte = 0;
swidth = bitmap_get_rowstride(bmp->bitmap);
top = bitmap_get_buffer(bmp->bitmap);
bottom = top + swidth * (bmp->height - 1);
end = data + bytes;
addr = ((unsigned int)data) & 3;
for (y = 0; y < bmp->height; y++) {
while (addr != (((unsigned int)data) & 3))
data++;
if ((data + (bmp->width >> 3)) > end)
return BMP_INSUFFICIENT_DATA;
scanline = (unsigned int *)(bottom - (y * swidth));
for (x = 0; x < bmp->width; x++) {
if ((x & 7) == 0)
cur_byte = *data++;
if ((cur_byte & 128) == 0)
scanline[x] |= (0xff << 24);
cur_byte = cur_byte << 1;
}
}
return BMP_OK;
}
/**
* Decode BMP data stored encoded in either RLE4 or RLE8.
*
* \param bmp the BMP image to decode
* \param data the data to decode
* \param bytes the number of bytes of data available
* \param size the size of the RLE tokens (4 or 8)
* \return BMP_OK on success
*/
bmp_result bmp_decode_rle(struct bmp_image *bmp, char *data, int bytes, int size) {
char *top, *bottom, *end;
unsigned int *scanline;
unsigned int swidth;
int i, length, pixels_left;
unsigned int x = 0, y = 0, last_y = 0;
unsigned int pixel = 0, pixel2;
if (bmp->ico)
return BMP_DATA_ERROR;
swidth = bitmap_get_rowstride(bmp->bitmap);
top = bitmap_get_buffer(bmp->bitmap);
bottom = top + swidth * (bmp->height - 1);
end = data + bytes;
bmp->decoded = true;
do {
if (data + 2 > end)
return BMP_INSUFFICIENT_DATA;
length = *data++;
if (length == 0) {
length = *data++;
if (length == 0) {
/* 00 - 00 means end of scanline */
x = 0;
if (last_y == y) {
if (++y > bmp->height)
return BMP_DATA_ERROR;
}
last_y = y;
} else if (length == 1) {
/* 00 - 01 means end of RLE data */
return BMP_OK;
} else if (length == 2) {
/* 00 - 02 - XX - YY means move cursor */
if (data + 2 > end)
return BMP_INSUFFICIENT_DATA;
x += *data++;
if (x >= bmp->width)
return BMP_DATA_ERROR;
y += *data++;
if (y >= bmp->height)
return BMP_DATA_ERROR;
} else {
/* 00 - NN means escape NN pixels */
if (bmp->reversed) {
pixels_left = (y + 1) * bmp->width - x;
scanline = (unsigned int *)(top + (y * swidth));
} else {
pixels_left = (bmp->height - y + 1) * bmp->width - x;
scanline = (unsigned int *)(bottom - (y * swidth));
}
if (length > pixels_left)
length = pixels_left;
if (data + length > end)
return BMP_INSUFFICIENT_DATA;
/* the following code could be easily optimised by simply
* checking the bounds on entry and using some simply copying
* routines if so */
if (size == 8) {
for (i = 0; i < length; i++) {
if (x >= bmp->width) {
x = 0;
if (++y > bmp->height)
return BMP_DATA_ERROR;
scanline -= bmp->width;
}
scanline[x++] = bmp->colour_table[(int)*data++];
}
} else {
for (i = 0; i < length; i++) {
if (x >= bmp->width) {
x = 0;
if (++y > bmp->height)
return BMP_DATA_ERROR;
scanline -= bmp->width;
}
if ((i & 1) == 0) {
pixel = *data++;
scanline[x++] = bmp->colour_table
[pixel >> 4];
} else {
scanline[x++] = bmp->colour_table
[pixel & 0xf];
}
}
length = (length + 1) >> 1;
}
if ((length & 1) && (*data++ != 0x00))
return BMP_DATA_ERROR;
}
} else {
/* NN means perform RLE for NN pixels */
if (bmp->reversed) {
pixels_left = (y + 1) * bmp->width - x;
scanline = (unsigned int *)(top + (y * swidth));
} else {
pixels_left = (bmp->height - y + 1) * bmp->width - x;
scanline = (unsigned int *)(bottom - (y * swidth));
}
if (length > pixels_left)
length = pixels_left;
/* the following code could be easily optimised by simply
* checking the bounds on entry and using some simply copying
* routines if so */
if (size == 8) {
pixel = bmp->colour_table[(int)*data++];
for (i = 0; i < length; i++) {
if (x >= bmp->width) {
x = 0;
if (++y > bmp->height)
return BMP_DATA_ERROR;
scanline -= bmp->width;
}
scanline[x++] = pixel;
}
} else {
pixel2 = *data++;
pixel = bmp->colour_table[pixel2 >> 4];
pixel2 = bmp->colour_table[pixel2 & 0xf];
for (i = 0; i < length; i++) {
if (x >= bmp->width) {
x = 0;
if (++y > bmp->height)
return BMP_DATA_ERROR;
scanline -= bmp->width;
}
if ((i & 1) == 0)
scanline[x++] = pixel;
else
scanline[x++] = pixel2;
}
}
}
} while (data < end);
return BMP_OK;
}
/**
* Finalise a BMP prior to destruction.
*
* \param bmp the BMP image to finalise
*/
void bmp_finalise(struct bmp_image *bmp) {
if (bmp->bitmap)
bitmap_destroy(bmp->bitmap);
bmp->bitmap = NULL;
if (bmp->colour_table)
free(bmp->colour_table);
bmp->colour_table = NULL;
}
/**
* Finalise an ICO prior to destruction.
*
* \param ico the ICO image to finalise
*/
void ico_finalise(struct ico_collection *ico) {
struct ico_image *image;
for (image = ico->first; image; image = image->next)
bmp_finalise(&image->bmp);
while (ico->first) {
image = ico->first;
ico->first = image->next;
free(image);
}
}
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