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bmpcodec.c
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/*
* Copyright (c) 2004 Ximian
* Copyright (C) 2003-2004,2007 Novell, Inc (http://www.novell.com)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
* and associated documentation files (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
* NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* bmpcodec.c : Contains function definitions for encoding decoding bmp images
*
* Authors:
* Jordi Mas i Hernandez ([email protected])
* Sanjay Gupta ([email protected])
* Mark Steele ([email protected])
* Jonathan Gilbert ([email protected])
* Sebastien Pouliot <[email protected]>
*
* Useful documentation about bitmaps
*
* http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdi/bitmaps_4v1h.asp
* http://www.csdn.net/Dev/Format/windows/Bmp.html
* http://www.fortunecity.com/skyscraper/windows/364/bmpffrmt.html
*
* Header structure
* BITMAPFILEHEADER
* BITMAPINFOHEADER or BITMAPV4HEADER or BITMAPV5HEADER or BITMAPCOREHEADER
* RGBQUADS or RGBTRIPLE (optional)
* Bitmap data
*/
#include "gdiplus-private.h"
#include "bmpcodec.h"
GUID gdip_bmp_image_format_guid = {0xb96b3cabU, 0x0728U, 0x11d3U, {0x9d, 0x7b, 0x00, 0x00, 0xf8, 0x1e, 0xf3, 0x2e}};
/* Codecinfo related data*/
static ImageCodecInfo bmp_codec;
static const WCHAR bmp_codecname[] = {'B', 'u', 'i','l', 't', '-','i', 'n', ' ', 'B', 'M', 'P', 0}; /* Built-in BMP */
static const WCHAR bmp_extension[] = {'*','.','B', 'M', 'P',';', '*','.', 'D','I', 'B',';', '*','.', 'R', 'L', 'E',0}; /* *.BMP;*.DIB;*.RLE */
static const WCHAR bmp_mimetype[] = {'i', 'm', 'a','g', 'e', '/', 'b', 'm', 'p', 0}; /* image/bmp */
static const WCHAR bmp_format[] = {'B', 'M', 'P', 0}; /* BMP */
static const BYTE bmp_sig_pattern[] = { 0x42, 0x4D };
static const BYTE bmp_sig_mask[] = { 0xFF, 0xFF };
ImageCodecInfo *
gdip_getcodecinfo_bmp ()
{
bmp_codec.Clsid = (CLSID) { 0x557cf400, 0x1a04, 0x11d3, { 0x9a, 0x73, 0x0, 0x0, 0xf8, 0x1e, 0xf3, 0x2e } };
bmp_codec.FormatID = gdip_bmp_image_format_guid;
bmp_codec.CodecName = (const WCHAR*) bmp_codecname;
bmp_codec.DllName = NULL;
bmp_codec.FormatDescription = (const WCHAR*) bmp_format;
bmp_codec.FilenameExtension = (const WCHAR*) bmp_extension;
bmp_codec.MimeType = (const WCHAR*) bmp_mimetype;
bmp_codec.Flags = ImageCodecFlagsEncoder | ImageCodecFlagsDecoder | ImageCodecFlagsSupportBitmap | ImageCodecFlagsBuiltin;
bmp_codec.Version = 1;
bmp_codec.SigCount = 1;
bmp_codec.SigSize = 2;
bmp_codec.SigPattern = bmp_sig_pattern;
bmp_codec.SigMask = bmp_sig_mask;
return &bmp_codec;
}
static GpStatus
gdip_get_bmp_pixelformat (BITMAPV5HEADER *bih, PixelFormat *dest)
{
int bitCount = bih->bV5BitCount;
int compression = bih->bV5Compression;
switch (compression) {
case BI_BITFIELDS:
if (bitCount != 16)
return OutOfMemory;
if ((bih->bV5RedMask == 0x7C00) && (bih->bV5GreenMask == 0x3E0) && (bih->bV5BlueMask == 0x1F))
*dest = PixelFormat16bppRGB555;
else if ((bih->bV5RedMask == 0xF800) && (bih->bV5GreenMask == 0x7E0) && (bih->bV5BlueMask == 0x1F))
*dest = PixelFormat16bppRGB565;
else
*dest = PixelFormat32bppRGB;
break;
default:
switch (bitCount) {
case 64:
*dest = PixelFormat64bppARGB;
break;
case 32:
*dest = PixelFormat32bppRGB;
break;
case 24:
*dest = PixelFormat24bppRGB;
break;
case 16:
*dest = PixelFormat16bppRGB555;
break;
case 8:
*dest = PixelFormat8bppIndexed;
break;
case 4:
*dest = PixelFormat4bppIndexed;
break;
case 1:
*dest = PixelFormat1bppIndexed;
break;
default:
return OutOfMemory;
}
}
return Ok;
}
static void
gdip_bitmap_fill_info_header (GpBitmap *bitmap, PBITMAPINFOHEADER bmi)
{
PixelFormat format = bitmap->active_bitmap->pixel_format;
memset (bmi, 0, sizeof (BITMAPINFOHEADER));
#ifdef WORDS_BIGENDIAN
bmi->biSize = GUINT32_FROM_LE (sizeof (BITMAPINFOHEADER));
bmi->biWidth = GULONG_FROM_LE (bitmap->active_bitmap->width);
bmi->biHeight = GULONG_FROM_LE (bitmap->active_bitmap->height);
bmi->biPlanes = GUINT16_FROM_LE (1);
if (format != PixelFormat24bppRGB)
bmi->biBitCount = GUINT16_FROM_LE (gdip_get_pixel_format_bpp (bitmap->active_bitmap->pixel_format));
else
bmi->biBitCount = GUINT16_FROM_LE (24);
bmi->biCompression = GUINT32_FROM_LE (BI_RGB);
bmi->biSizeImage = GUINT32_FROM_LE (0); /* Many tools expect this may be set to zero for BI_RGB bitmaps */
bmi->biXPelsPerMeter = GULONG_FROM_LE ((int) (0.5f + ((gdip_get_display_dpi() * 3937) / 100)));
bmi->biYPelsPerMeter = GULONG_FROM_LE ((int) (0.5f + ((gdip_get_display_dpi() * 3937) / 100))); /* 1 meter is = 39.37 */
#else
bmi->biSize = sizeof (BITMAPINFOHEADER);
bmi->biWidth = bitmap->active_bitmap->width;
bmi->biHeight = bitmap->active_bitmap->height;
bmi->biPlanes = 1;
if (format != PixelFormat24bppRGB)
bmi->biBitCount = gdip_get_pixel_format_bpp (bitmap->active_bitmap->pixel_format);
else
bmi->biBitCount = 24;
bmi->biCompression = BI_RGB;
bmi->biSizeImage = 0; /* Many tools expect this may be set to zero for BI_RGB bitmaps */
bmi->biXPelsPerMeter = (int) (0.5f + ((gdip_get_display_dpi() * 3937) / 100));
bmi->biYPelsPerMeter = (int) (0.5f + ((gdip_get_display_dpi() * 3937) / 100)); /* 1 meter is = 39.37 */
#endif
}
static GpStatus
gdip_read_bmp_rle_8bit (void *pointer, BYTE *scan0, BOOL upsidedown, int stride, int scanWidth, int scanCount, ImageSource source)
{
BYTE code;
int bytes_read;
int col_offset = 0;
int row_offset = (upsidedown ? (scanCount - 1) * stride : 0);
int row_delta = (upsidedown ? -stride : +stride);
int rows_remaining = scanCount;
BOOL new_row = FALSE;
if (scanWidth > stride)
return InvalidParameter;
while ((rows_remaining > 0)
|| ((row_offset == 0) && (col_offset < scanWidth))) {
bytes_read = gdip_read_bmp_data (pointer, &code, 1, source);
if (bytes_read < 1)
return GenericError; /* TODO?: Add an "unexpected end of file" error code */
if (code == 0) { /* RLE escape code */
bytes_read = gdip_read_bmp_data (pointer, &code, 1, source);
if (bytes_read < 1)
return GenericError; /* TODO?: Add an "unexpected end of file" error code */
switch (code)
{
case 0: /* skip remainder of scan */
{
if (new_row)
new_row = FALSE;
else {
row_offset += row_delta;
rows_remaining--;
col_offset = 0;
}
break;
}
case 1: /* skip remainder of image -- in other words, we're finished :-) */
{
return Ok;
}
case 2: /* jump forward (dx, dy) coordinates */
{
BYTE dx, dy;
bytes_read = gdip_read_bmp_data (pointer, &dx, 1, source);
bytes_read += gdip_read_bmp_data (pointer, &dy, 1, source);
if (bytes_read < 2)
return GenericError; /* TODO?: Add an "unexpected end of file" error code */
/* not really sure how to handle the case where the X delta goes
* past the end of the scan. in the interest of not crashing,
* let's wrap it back around.
*/
col_offset = (col_offset + dx) % scanWidth;
row_offset -= dy * stride; /* BMPs go from bottom to top */
new_row = FALSE;
break;
}
default: /* an uncompressed section, 'code' pixels wide */
{
/* uncompressed sections must be an even number of bytes long,
* even if they are an odd number of *pixels* long.
*/
BOOL pad_byte_present = ((code & 1) != 0);
int bytes_to_read = code;
/* wrap rows properly, even though they are inverted in memory */
while (bytes_to_read > 0) {
int bytes_to_read_this_scan = scanWidth - col_offset;
if (bytes_to_read_this_scan > bytes_to_read)
bytes_to_read_this_scan = bytes_to_read;
bytes_read = gdip_read_bmp_data (
pointer,
&scan0[row_offset + col_offset],
bytes_to_read_this_scan,
source);
if (bytes_read < bytes_to_read_this_scan)
return GenericError; /* TODO?: Add an "unexpected end of file" error code */
col_offset += bytes_read;
bytes_to_read -= bytes_read;
if (col_offset >= scanWidth)
{
col_offset = 0;
row_offset += row_delta;
rows_remaining--;
if (rows_remaining <= 0) /* more data than expected -- let's not make this a fatal error */
return Ok;
new_row = TRUE;
}
else
new_row = FALSE;
}
if (pad_byte_present) {
bytes_read = gdip_read_bmp_data(pointer, &code, 1, source);
if (bytes_read < 1)
return GenericError; /* TODO?: Add an "unexpected end of file" error code */
}
break;
}
}
}
else {
/* we have a run of length 'code'. the colour of the run is the next byte in the file. */
int run_length = code;
BYTE pixel_value;
bytes_read = gdip_read_bmp_data(pointer, &pixel_value, 1, source);
if (bytes_read < 1)
return GenericError; /* TODO?: Add an "unexpected end of file" error code */
while (run_length > 0) {
int bytes_to_run_this_scan = scanWidth - col_offset;
if (bytes_to_run_this_scan > run_length)
bytes_to_run_this_scan = run_length;
memset (scan0 + row_offset + col_offset, pixel_value, bytes_to_run_this_scan);
col_offset += bytes_to_run_this_scan;
run_length -= bytes_to_run_this_scan;
if (col_offset >= scanWidth)
{
col_offset = 0;
row_offset += row_delta;
rows_remaining--;
if (rows_remaining <= 0) /* more data than expected -- let's not make this a fatal error */
return Ok;
new_row = TRUE;
}
else
new_row = FALSE;
}
}
}
return Ok;
}
ARGB
gdip_convert_16bppRGB555_ToARGB (WORD pixel)
{
return ((pixel & 0x1F) >> 2) | 8 * ((pixel & 0x1F) | 8 * (((((pixel >> 5) & 0x1F) | (((pixel >> 10) & 0x1C) << 8)) & 0xFFFFFFFC) | 32 * (((pixel >> 5) & 0x1F) | ((((pixel >> 10) & 0x1F) | 0xFFFFFFE0) << 8))));
}
ARGB
gdip_convert_16bppRGB565_ToARGB (WORD pixel)
{
return ((pixel & 0x1F) >> 2) | 8 * ((pixel & 0x1F) | 2 * (((((pixel >> 5) & 0x3F) | (((pixel >> 11) & 0xFFFFFFFC) << 10)) & 0xFFFFFFF0) | ((((pixel >> 5) & 0x3F) | ((((pixel >> 11)) | 0xFFFFFFE0) << 9)) << 6)));
}
static GpStatus
gdip_read_bmp_rle_4bit (void *pointer, BYTE *scan0, BOOL upsidedown, int stride, int scanWidth, int scanCount, ImageSource source)
{
BYTE code;
int bytes_read;
int col_offset = 0;
int row_offset = (upsidedown ? (scanCount - 1) * stride : 0);
int row_delta = (upsidedown ? -stride : +stride);
int rows_remaining = scanCount;
BOOL new_row = FALSE;
if ((scanWidth & 1) != 0)
scanWidth++;
if (scanWidth > stride * 2)
return InvalidParameter;
while (rows_remaining > 0) {
bytes_read = gdip_read_bmp_data (pointer, &code, 1, source);
if (bytes_read < 1)
return GenericError; /* TODO?: Add an "unexpected end of file" error code */
if (code == 0) { /* RLE escape code */
bytes_read = gdip_read_bmp_data (pointer, &code, 1, source);
if (bytes_read < 1)
return GenericError; /* TODO?: Add an "unexpected end of file" error code */
switch (code)
{
case 0: /* skip remainder of scan */
{
if (new_row)
new_row = FALSE;
else {
row_offset += row_delta;
rows_remaining--;
col_offset = 0;
}
break;
}
case 1: /* skip remainder of image -- in other words, we're finished :-) */
{
return Ok;
}
case 2: /* jump forward (dx, dy) coordinates */
{
BYTE dx, dy;
bytes_read = gdip_read_bmp_data (pointer, &dx, 1, source);
bytes_read += gdip_read_bmp_data (pointer, &dy, 1, source);
if (bytes_read < 2)
return GenericError; /* TODO?: Add an "unexpected end of file" error code */
/* not really sure how to handle the case where the X delta goes
* past the end of the scan. in the interest of not crashing,
* let's wrap it back around.
*/
col_offset = (col_offset + dx) % scanWidth;
row_offset -= dy * stride; /* BMPs go from bottom to top */
new_row = FALSE;
break;
}
default: /* an uncompressed section, 'code' pixels wide */
{
int pixels_to_read = code;
int bytes_of_data = (pixels_to_read + 1) / 2;
/* uncompressed sections must be an even number of bytes long,
* even if they are an odd number of *pixels* long.
*/
BOOL pad_byte_present = ((bytes_of_data & 1) != 0);
int bytes_to_read = pixels_to_read / 2; /* leave off the last pixel for now */
/* wrap rows properly, even though they are inverted in memory */
while (bytes_to_read > 0) {
if ((scanWidth - col_offset) == 1) {
/* special case: a pair of pixels is split across two rows. */
BYTE pixels, same_row_pixel, next_row_pixel;
bytes_read = gdip_read_bmp_data (pointer, &pixels, 1, source);
if (bytes_read < 1)
return GenericError; /* TODO?: Add an "unexpected end of file" error code */
same_row_pixel = (pixels >> 4) & 0x0F;
next_row_pixel = pixels & 0x0F;
if ((col_offset & 1) != 0) {
BYTE old_pixel = 0xF0 & scan0[row_offset + col_offset / 2];
scan0[row_offset + col_offset / 2] = (old_pixel & 0xF0) | same_row_pixel;
}
else
scan0[row_offset + col_offset / 2] = same_row_pixel << 4;
col_offset = 1;
row_offset += row_delta;
rows_remaining--;
if (rows_remaining <= 0) /* more data than expected -- let's not make this a fatal error */
return Ok;
scan0[row_offset] = next_row_pixel << 4;
new_row = FALSE;
}
else if ((col_offset & 1) == 0) {
/* alignment is good; we can read pairs of pixels as bytes.
* if there are an odd number of pixels in a scan, though,
* then the last pixel will need to be special-cased. also,
* if the scan width is odd, then a byte will be split
* across a row ending. I don't know if this is in the spec,
* but it is the most resistant to crashing.
*/
int bytes_to_read_this_scan = (scanWidth - col_offset) / 2;
if (bytes_to_read_this_scan > bytes_to_read)
bytes_to_read_this_scan = bytes_to_read;
bytes_read = gdip_read_bmp_data (
pointer,
&scan0[row_offset + col_offset / 2],
bytes_to_read_this_scan,
source);
if (bytes_read < bytes_to_read_this_scan)
return GenericError; /* TODO?: Add an "unexpected end of file" error code */
col_offset += bytes_read * 2;
bytes_to_read -= bytes_read;
new_row = FALSE;
}
else {
/* bad alignment; nybble-swapping will be required */
BYTE last_high_nybble = 0xF0 & scan0[row_offset + col_offset / 2];
int bytes_to_read_this_scan = (scanWidth - col_offset) / 2;
if (bytes_to_read_this_scan > bytes_to_read)
bytes_to_read_this_scan = bytes_to_read;
while (bytes_to_read_this_scan >= 0) {
BYTE pixels;
bytes_read = gdip_read_bmp_data (pointer, &pixels, 1, source);
if (bytes_read < 1)
return GenericError; /* TODO?: Add an "unexpected end of file" error code */
scan0[row_offset + col_offset / 2] = last_high_nybble | (pixels >> 4);
last_high_nybble = (pixels << 4) & 0xF0;
col_offset += 2; /* two pixels processed */
bytes_to_read_this_scan--;
}
new_row = FALSE;
}
if (col_offset >= scanWidth) {
col_offset = 0;
row_offset += row_delta;
rows_remaining--;
if (rows_remaining <= 0) /* more data than expected -- let's not make this a fatal error */
return Ok;
new_row = TRUE;
}
}
if ((pixels_to_read & 1) != 0) {
/* half of a byte remains to be inserted into the correct nybble */
BYTE pixel;
bytes_read = gdip_read_bmp_data (pointer, &pixel, 1, source);
if (bytes_read < 1)
return GenericError; /* TODO?: Add an "unexpected end of file" error code */
pixel >>= 4; /* the last pixel is in the high nybble */
if ((col_offset & 1) != 0) {
BYTE old_pixel = 0xF0 & scan0[row_offset + col_offset / 2];
scan0[row_offset + col_offset / 2] = (old_pixel & 0xF0) | pixel;
}
else
scan0[row_offset + col_offset / 2] = pixel << 4;
col_offset++;
if (col_offset >= scanWidth) {
col_offset = 0;
row_offset += row_delta;
rows_remaining--;
if (rows_remaining <= 0) /* more data than expected -- let's not make this a fatal error */
return Ok;
new_row = TRUE;
}
else
new_row = FALSE;
}
if (pad_byte_present) {
bytes_read = gdip_read_bmp_data(pointer, &code, 1, source);
if (bytes_read < 1)
return GenericError; /* TODO?: Add an "unexpected end of file" error code */
}
break;
}
}
}
else {
/* we have a run of length 'code'. the colour of the run is the next byte in the file.
* something weird is happening here in 4-bit land, though; a byte stores two pixels.
* what happens is rather odd: the run is actually of two alternating colours (which
* may, of course, be the same, but are not required to be). we need to make sure that
* the colours end up in the right nybbles of the output bytes.
*/
int run_pixels = code;
int run_length = run_pixels / 2;
BYTE pixel_values;
BYTE inverted_pixel_values;
bytes_read = gdip_read_bmp_data(pointer, &pixel_values, 1, source);
if (bytes_read < 1)
return GenericError; /* TODO?: Add an "unexpected end of file" error code */
inverted_pixel_values = ((pixel_values & 0x0F) << 4) | ((pixel_values & 0xF0) >> 4);
if ((col_offset & 1) != 0) {
BYTE temp = inverted_pixel_values;
inverted_pixel_values = pixel_values;
pixel_values = temp;
}
while (run_length > 0) {
if ((scanWidth - col_offset) == 1) {
/* special case: a pair of pixels is split across two rows. */
BYTE same_row_pixel = (pixel_values >> 4) & 0x0F;
BYTE next_row_pixel = pixel_values & 0x0F;
if ((col_offset & 1) != 0) {
BYTE old_pixel = 0xF0 & scan0[row_offset + col_offset / 2];
scan0[row_offset + col_offset / 2] = (old_pixel & 0xF0) | same_row_pixel;
}
else
scan0[row_offset + col_offset / 2] = same_row_pixel << 4;
col_offset = 1;
row_offset += row_delta;
rows_remaining--;
if (rows_remaining <= 0) /* more data than expected -- let's not make this a fatal error */
return Ok;
scan0[row_offset] = next_row_pixel << 4;
new_row = FALSE;
if ((scanWidth & 1) != 0) {
/* if the width of the scan is odd, then the nybbles swap
* places each time they cross from one row to the next
*/
BYTE temp = inverted_pixel_values;
inverted_pixel_values = pixel_values;
pixel_values = temp;
}
}
else {
int bytes_to_run_this_scan;
/* make sure we're byte-aligned; if we're not, we need to store a nybble first */
if ((col_offset & 1) != 0) {
BYTE old_pixel = 0xF0 & scan0[row_offset + col_offset / 2];
scan0[row_offset + col_offset / 2] = (old_pixel & 0xF0) | (pixel_values & 0x0F);
col_offset++;
}
bytes_to_run_this_scan = (scanWidth - col_offset) / 2;
if (bytes_to_run_this_scan > run_length)
bytes_to_run_this_scan = run_length;
memset (scan0 + row_offset + col_offset / 2, pixel_values, bytes_to_run_this_scan);
col_offset += bytes_to_run_this_scan * 2;
run_length -= bytes_to_run_this_scan;
if (col_offset >= scanWidth) {
col_offset = 0;
row_offset += row_delta;
rows_remaining--;
if (rows_remaining <= 0) /* more data than expected -- let's not make this a fatal error */
return Ok;
new_row = TRUE;
if ((scanWidth & 1) != 0) {
/* if the width of the scan is odd, then the nybbles swap
* places each time they cross from one row to the next
*/
BYTE temp = inverted_pixel_values;
inverted_pixel_values = pixel_values;
pixel_values = temp;
}
}
else
new_row = FALSE;
}
}
if ((run_pixels & 1) != 0) {
/* half of a byte remains to be inserted into the correct nybble */
BYTE pixel = pixel_values >> 4; /* the last pixel is in the high nybble */
if ((col_offset & 1) != 0) {
BYTE old_pixel = 0xF0 & scan0[row_offset + col_offset / 2];
scan0[row_offset + col_offset / 2] = (old_pixel & 0xF0) | pixel;
}
else
scan0[row_offset + col_offset / 2] = pixel << 4;
col_offset++;
if (col_offset >= scanWidth) {
col_offset = 0;
row_offset += row_delta;
rows_remaining--;
if (rows_remaining <= 0) /* more data than expected -- let's not make this a fatal error */
return Ok;
new_row = TRUE;
}
else
new_row = FALSE;
}
}
}
return Ok;
}
GpStatus
gdip_read_BITMAPINFOHEADER (void *pointer, ImageSource source, BITMAPV5HEADER *bmi, BOOL *os2format, BOOL *upsidedown)
{
DWORD dw = 0;
BYTE *data_read = (BYTE*)&dw;
int size = sizeof (DWORD);
int size_read = gdip_read_bmp_data (pointer, data_read, size, source);
if (size_read < size)
return OutOfMemory;
DWORD headerSize = (data_read[3]<<24 | data_read[2]<<16 | data_read[1]<<8 | data_read[0]);
switch (headerSize) {
case BITMAPCOREHEADER_SIZE:
bmi->bV5Size = headerSize;
/* Old OS/2 format. Width and Height fields are WORDs instead of DWORDS */
dw = 0;
size_read = gdip_read_bmp_data (pointer, data_read, size, source);
if (size_read < size)
return OutOfMemory;
bmi->bV5Width = (data_read[1]<<8 | data_read[0]);
bmi->bV5Height = (data_read[3]<<8 | data_read[2]);
*os2format = TRUE;
break;
case sizeof (BITMAPINFOHEADER):
case sizeof (BITMAPV3HEADER):
case sizeof (BITMAPV4HEADER):
case sizeof (BITMAPV5HEADER):
bmi->bV5Size = headerSize;
dw = 0;
size_read = gdip_read_bmp_data (pointer, data_read, size, source);
if (size_read < size)
return OutOfMemory;
bmi->bV5Width = (data_read[3]<<24 | data_read[2]<<16 | data_read[1]<<8 | data_read[0]);
dw = 0;
size_read = gdip_read_bmp_data (pointer, data_read, size, source);
if (size_read < size)
return OutOfMemory;
bmi->bV5Height = (data_read[3]<<24 | data_read[2]<<16 | data_read[1]<<8 | data_read[0]);
break;
default:
/* This is an unknown or invalid header. */
return OutOfMemory;
}
dw = 0;
size_read = gdip_read_bmp_data (pointer, data_read, size, source);
if (size_read < size)
return OutOfMemory;
bmi->bV5Planes = (data_read[1]<<8 | data_read[0]);
bmi->bV5BitCount = (data_read[3]<<8 | data_read[2]);
/* The OS/2 format doesn't have any of these other fields */
if (*os2format) {
bmi->bV5Compression = 0;
bmi->bV5SizeImage = 0;
bmi->bV5XPelsPerMeter = 0;
bmi->bV5YPelsPerMeter = 0;
bmi->bV5ClrUsed = 0;
bmi->bV5ClrImportant = 0;
return Ok;
}
dw = 0;
size_read = gdip_read_bmp_data (pointer, data_read, size, source);
if (size_read < size)
return OutOfMemory;
bmi->bV5Compression = (data_read[3]<<24 | data_read[2]<<16 | data_read[1]<<8 | data_read[0]);
/* If the height is negative then the bitmap is sideup. */
if (bmi->bV5Height < 0) {
*upsidedown = FALSE;
bmi->bV5Height = -bmi->bV5Height;
}
dw = 0;
size_read = gdip_read_bmp_data (pointer, data_read, size, source);
if (size_read < size)
return OutOfMemory;
bmi->bV5SizeImage = (data_read[3]<<24 | data_read[2]<<16 | data_read[1]<<8 | data_read[0]);
dw = 0;
size_read = gdip_read_bmp_data (pointer, data_read, size, source);
if (size_read < size)
return OutOfMemory;
bmi->bV5XPelsPerMeter = (data_read[3]<<24 | data_read[2]<<16 | data_read[1]<<8 | data_read[0]);
dw = 0;
size_read = gdip_read_bmp_data (pointer, data_read, size, source);
if (size_read < size)
return OutOfMemory;
bmi->bV5YPelsPerMeter = (data_read[3]<<24 | data_read[2]<<16 | data_read[1]<<8 | data_read[0]);
dw = 0;
size_read = gdip_read_bmp_data (pointer, data_read, size, source);
if (size_read < size)
return OutOfMemory;
bmi->bV5ClrUsed = (data_read[3]<<24 | data_read[2]<<16 | data_read[1]<<8 | data_read[0]);
dw = 0;
size_read = gdip_read_bmp_data (pointer, data_read, size, source);
if (size_read < size)
return OutOfMemory;
bmi->bV5ClrImportant = (data_read[3]<<24 | data_read[2]<<16 | data_read[1]<<8 | data_read[0]);
/* We've finished reading the BITMAPINFOHEADER but later versions are larger. */
if (bmi->bV5Size == sizeof (BITMAPINFOHEADER)) {
// A 16bpp BITMAPINFOHEADER BI_BITFIELDS image is followed by a red, green and blue mask.
if (bmi->bV5BitCount != 16 || bmi->bV5Compression != BI_BITFIELDS)
return Ok;
}
dw = 0;
size_read = gdip_read_bmp_data (pointer, data_read, size, source);
if (size_read < size)
return OutOfMemory;
bmi->bV5RedMask = (data_read[3]<<24 | data_read[2]<<16 | data_read[1]<<8 | data_read[0]);
dw = 0;
size_read = gdip_read_bmp_data (pointer, data_read, size, source);
if (size_read < size)
return OutOfMemory;
bmi->bV5GreenMask = (data_read[3]<<24 | data_read[2]<<16 | data_read[1]<<8 | data_read[0]);
dw = 0;
size_read = gdip_read_bmp_data (pointer, data_read, size, source);
if (size_read < size)
return OutOfMemory;
bmi->bV5BlueMask = (data_read[3]<<24 | data_read[2]<<16 | data_read[1]<<8 | data_read[0]);
if (bmi->bV5Size == sizeof (BITMAPINFOHEADER))
return Ok;
dw = 0;
size_read = gdip_read_bmp_data (pointer, data_read, size, source);
if (size_read < size)
return OutOfMemory;
bmi->bV5AlphaMask = (data_read[3]<<24 | data_read[2]<<16 | data_read[1]<<8 | data_read[0]);
/* We don't use any information in BITMAPV4HEADER or BITMAPV5HEADER, so there is no point going through all of
* the other fields. This leaves the rest of the structure uninitialized. */
size = headerSize - sizeof (BITMAPV3HEADER);
if (size > 0) {
while (size > sizeof (DWORD)) {
if (gdip_read_bmp_data (pointer, data_read, sizeof (DWORD), source) != sizeof (DWORD))
return OutOfMemory;
size -= sizeof (DWORD);
}
if (size > 0) {
if (gdip_read_bmp_data (pointer, data_read, size, source) != size)
return OutOfMemory;
}
}
return Ok;
}
/* For use with in-memory bitmaps, where the BITMAPFILEHEADER doesn't exists */
GpStatus
gdip_read_bmp_image (void *pointer, GpImage **image, ImageSource source)
{
BITMAPV5HEADER bmi;
GpBitmap *result = NULL;
BYTE *pixels = NULL;
int i;
PixelFormat format;
int colours;
BOOL os2format = FALSE;
BOOL upsidedown = TRUE;
int size_read;
BYTE *data_read = NULL;
int line;
int loop;
long index;
GpStatus status;
unsigned long long int size;
status = gdip_read_BITMAPINFOHEADER (pointer, source, &bmi, &os2format, &upsidedown);
if (status != Ok)
goto error;
colours = (bmi.bV5ClrUsed == 0 && bmi.bV5BitCount <= 8) ? (1 << bmi.bV5BitCount) : bmi.bV5ClrUsed;
status = gdip_get_bmp_pixelformat (&bmi, &format);
if (status != Ok) {
/* bit count mismatch */
goto error;
}
result = gdip_bitmap_new_with_frame (NULL, TRUE);
if (!result) {
status = OutOfMemory;
goto error;
}
result->type = ImageTypeBitmap;
result->image_format = BMP;
result->active_bitmap->pixel_format = format;
result->active_bitmap->width = bmi.bV5Width;
result->active_bitmap->height = bmi.bV5Height;
/* biWidth and biHeight are LONG (32 bits signed integer) */
size = bmi.bV5Width;
switch (result->active_bitmap->pixel_format) {
case PixelFormat1bppIndexed:
result->active_bitmap->stride = (size + 7) / 8;
break;
case PixelFormat4bppIndexed:
result->active_bitmap->stride = (size + 1) / 2;
break;
case PixelFormat8bppIndexed:
result->active_bitmap->stride = size;
break;
default:
/* For other types, we assume 32 bit and translate into 32 bit from source format */
result->active_bitmap->pixel_format = PixelFormat32bppRGB;
/* fall-thru */
case PixelFormat24bppRGB:
case PixelFormat64bppARGB:
/* stride is a (signed) _int_ and once multiplied by 4 it should hold a value that can be allocated by GdipAlloc
* this effectively limits 'width' to 536870911 pixels */
size *= 4;
if (size > G_MAXINT32) {
status = InvalidParameter;
goto error;
}
result->active_bitmap->stride = size;
break;
}
/* Ensure 32bits alignment */
gdip_align_stride (result->active_bitmap->stride);
if (colours) {
result->active_bitmap->palette = GdipAlloc (sizeof(ColorPalette) + sizeof(ARGB) * colours);
if (result->active_bitmap->palette == NULL) {
status = OutOfMemory;
goto error;
}
result->active_bitmap->palette->Flags = 0;
result->active_bitmap->palette->Count = colours;
/* Read optional colour table */
size = (os2format) ? 3 /* RGBTRIPLE */ : 4 /* RGBquads */;
data_read = (BYTE*) GdipAlloc(size);
if (data_read == NULL) {
status = OutOfMemory;
goto error;
}
for (i = 0; i < colours; i++) {
size_read = gdip_read_bmp_data (pointer, data_read, size, source);
if (size_read < size) {
status = OutOfMemory;
goto error;
}
set_pixel_bgra (result->active_bitmap->palette->Entries, i * 4,
(data_read[0] & 0xFF), /* B */
(data_read[1] & 0xFF), /* G */
(data_read[2] & 0xFF), /* R */
0xFF); /* Alpha */
}
GdipFree(data_read);
data_read = NULL;
}
size = result->active_bitmap->stride;
/* ensure total 'size' does not overflow an integer and fits inside our 2GB limit */
size *= result->active_bitmap->height;
if (size > G_MAXINT32) {
status = OutOfMemory;
goto error;
}
pixels = GdipAlloc (size);
if (pixels == NULL) {
status = OutOfMemory;
goto error;
}
if (gdip_is_an_indexed_pixelformat (format) && ((bmi.bV5Compression == BI_RLE4) || (bmi.bV5Compression == BI_RLE8))) {
switch (bmi.bV5Compression) {
case BI_RLE4:
gdip_read_bmp_rle_4bit (pointer, pixels, upsidedown, result->active_bitmap->stride, result->active_bitmap->width, result->active_bitmap->height, source);
break;
case BI_RLE8:
gdip_read_bmp_rle_8bit (pointer, pixels, upsidedown, result->active_bitmap->stride, result->active_bitmap->width, result->active_bitmap->height, source);
break;
}
} else {
/* Size contains the size of the lines on disk */
switch (bmi.bV5BitCount) {
case 1: {
size = ((result->active_bitmap->width + 31) & ~31) / 8;
loop = result->active_bitmap->width / 8;
/* we assume 0s for 1 bit, only setting 1s */
memset(pixels, 0, result->active_bitmap->stride * result->active_bitmap->height);
break;
}
case 4: {
size = ((bmi.bV5BitCount * result->active_bitmap->width + 31) & ~31) / 8;
loop = ((result->active_bitmap->width + 1) &~1) / 2;