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gdiplus: Implement BMP encoding. 

Implement the encoding function for GDI+ images so that
GdipSaveImageToStream can encode images as BMP files.
This commit is contained in:
Nathan Beckmann 2008-03-10 08:16:56 -07:00 committed by Alexandre Julliard
parent 9475e3f53b
commit 75841d8323
2 changed files with 47 additions and 5 deletions
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46
dlls/gdiplus/image.c
View File

@ -838,10 +838,54 @@ GpStatus WINGDIPAPI GdipSaveImageToFile(GpImage *image, GDIPCONST WCHAR* filenam
* Encoding functions -
* These functions encode an image in different image file formats.
*/
#define BITMAP_FORMAT_BMP 0x4d42 /* "BM" */
#define BITMAP_FORMAT_JPEG 0xd8ff
#define BITMAP_FORMAT_GIF 0x4947
#define BITMAP_FORMAT_PNG 0x5089
#define BITMAP_FORMAT_APM 0xcdd7
static GpStatus encode_image_BMP(LPVOID bitmap_bits, LPBITMAPINFO bitmap_info,
void **output, unsigned int *output_size)
{
return NotImplemented;
int num_palette_entries;
BITMAPFILEHEADER *bmp_file_hdr;
BITMAPINFO *bmp_info_hdr;
if (bitmap_info->bmiHeader.biClrUsed) {
num_palette_entries = bitmap_info->bmiHeader.biClrUsed;
if (num_palette_entries > 256) num_palette_entries = 256;
} else {
if (bitmap_info->bmiHeader.biBitCount <= 8)
num_palette_entries = 1 << bitmap_info->bmiHeader.biBitCount;
else
num_palette_entries = 0;
}
*output_size =
sizeof(BITMAPFILEHEADER) +
sizeof(BITMAPINFOHEADER) +
num_palette_entries * sizeof(RGBQUAD) +
bitmap_info->bmiHeader.biSizeImage;
*output = GdipAlloc(*output_size);
bmp_file_hdr = (BITMAPFILEHEADER*) *output;
bmp_file_hdr->bfType = BITMAP_FORMAT_BMP;
bmp_file_hdr->bfSize = *output_size;
bmp_file_hdr->bfOffBits =
sizeof(BITMAPFILEHEADER) +
sizeof(BITMAPINFOHEADER) +
num_palette_entries * sizeof (RGBQUAD);
bmp_info_hdr = (BITMAPINFO*) ((unsigned char*)(*output) + sizeof(BITMAPFILEHEADER));
memcpy(bmp_info_hdr, bitmap_info, sizeof(BITMAPINFOHEADER) + num_palette_entries * sizeof(RGBQUAD));
memcpy((unsigned char *)(*output) +
sizeof(BITMAPFILEHEADER) +
sizeof(BITMAPINFOHEADER) +
num_palette_entries * sizeof(RGBQUAD),
bitmap_bits, bitmap_info->bmiHeader.biSizeImage);
return Ok;
}
typedef GpStatus encode_image_func(LPVOID bitmap_bits, LPBITMAPINFO bitmap_info,

6
dlls/gdiplus/tests/image.c
View File

@ -159,10 +159,8 @@ static void test_SavingImages(void)
stat = GdipGetImageEncoders(n, s, codecs);
if (stat != Ok) goto cleanup;
todo_wine {
stat = GdipSaveImageToFile((GpImage*)bm, filename, &codecs[0].Clsid, 0);
expect(stat, Ok);
}
stat = GdipSaveImageToFile((GpImage*)bm, filename, &codecs[0].Clsid, 0);
expect(stat, Ok);
cleanup:
if (codecs)