static void pSaveImageAs(HWND hwnd)
{
OPENFILENAMEW sfn;
ImageCodecInfo *codecInfo;
WCHAR szSaveFileName[MAX_PATH];
WCHAR *szFilterMask;
GUID rawFormat;
UINT num;
UINT size;
UINT sizeRemain;
UINT j;
WCHAR *c;
GdipGetImageEncodersSize(&num, &size);
codecInfo = malloc(size);
if (!codecInfo)
{
DPRINT1("malloc() failed in pSaveImageAs()\n");
return;
}
GdipGetImageEncoders(num, size, codecInfo);
GdipGetImageRawFormat(image, &rawFormat);
sizeRemain = 0;
for (j = 0; j < num; ++j)
{
// Every pair needs space for the Description, twice the Extensions, 1 char for the space, 2 for the braces and 2 for the NULL terminators.
sizeRemain = sizeRemain + (((wcslen(codecInfo[j].FormatDescription) + (wcslen(codecInfo[j].FilenameExtension) * 2) + 5) * sizeof(WCHAR)));
}
/* Add two more chars for the last terminator */
sizeRemain = sizeRemain + (sizeof(WCHAR) * 2);
szFilterMask = malloc(sizeRemain);
if (!szFilterMask)
{
DPRINT1("cannot allocate memory for filter mask in pSaveImageAs()");
free(codecInfo);
return;
}
ZeroMemory(szSaveFileName, sizeof(szSaveFileName));
ZeroMemory(szFilterMask, sizeRemain);
ZeroMemory(&sfn, sizeof(sfn));
sfn.lStructSize = sizeof(sfn);
sfn.hwndOwner = hwnd;
sfn.hInstance = hInstance;
sfn.lpstrFile = szSaveFileName;
sfn.lpstrFilter = szFilterMask;
sfn.nMaxFile = MAX_PATH;
sfn.Flags = OFN_OVERWRITEPROMPT | OFN_HIDEREADONLY;
c = szFilterMask;
for (j = 0; j < num; ++j)
{
StringCbPrintfExW(c, sizeRemain, &c, &sizeRemain, 0, L"%ls (%ls)", codecInfo[j].FormatDescription, codecInfo[j].FilenameExtension);
/* Skip the NULL character */
c++;
sizeRemain -= sizeof(*c);
StringCbPrintfExW(c, sizeRemain, &c, &sizeRemain, 0, L"%ls", codecInfo[j].FilenameExtension);
/* Skip the NULL character */
c++;
sizeRemain -= sizeof(*c);
if (IsEqualGUID(&rawFormat, &codecInfo[j].FormatID) == TRUE)
{
sfn.nFilterIndex = j + 1;
}
}
if (GetSaveFileNameW(&sfn))
{
if (GdipSaveImageToFile(image, szSaveFileName, &codecInfo[sfn.nFilterIndex - 1].Clsid, NULL) != Ok)
{
DPRINT1("GdipSaveImageToFile() failed\n");
}
}
free(szFilterMask);
free(codecInfo);
}
int
main (int argc, char **argv)
{
GpImage *img;
gunichar2 *unis;
GpBitmap *bitmap;
GpStatus status;
int original_palette_size;
int reloaded_palette_size;
ColorPalette *original_palette;
ColorPalette *reloaded_palette;
GdiplusStartupInput gdiplusStartupInput;
ULONG_PTR gdiplusToken;
PixelFormat pixel_format;
ARGB color;
GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);
// PNG resave should preserve the palette transparency. Let's test it
// by loading a PNG file and its palette, then resaving it and loading
// it again for comparison.
unis = g_utf8_to_utf16 ("test-trns.png", -1, NULL, NULL, NULL);
status = GdipLoadImageFromFile (unis, &img);
CHECK_STATUS(1);
g_free (unis);
status = GdipGetImagePaletteSize (img, &original_palette_size);
CHECK_STATUS(1);
CHECK_ASSERT(original_palette_size > 0);
original_palette = malloc (original_palette_size);
GdipGetImagePalette (img, original_palette, original_palette_size);
CHECK_STATUS(1);
unis = g_utf8_to_utf16 ("test-trns-resave.png", -1, NULL, NULL, NULL);
status = GdipSaveImageToFile (img, unis, &png_clsid, NULL);
CHECK_STATUS(1);
GdipDisposeImage (img);
status = GdipLoadImageFromFile (unis, &img);
CHECK_STATUS(1);
g_free (unis);
status = GdipGetImagePaletteSize (img, &reloaded_palette_size);
CHECK_STATUS(1);
CHECK_ASSERT(reloaded_palette_size > 0);
CHECK_ASSERT(reloaded_palette_size == original_palette_size);
reloaded_palette = malloc (reloaded_palette_size);
GdipGetImagePalette (img, reloaded_palette, reloaded_palette_size);
CHECK_STATUS(1);
CHECK_ASSERT(memcmp (original_palette, reloaded_palette, original_palette_size) == 0);
GdipDisposeImage (img);
img = NULL;
unlink ("test-trns-resave.png");
free (original_palette);
free (reloaded_palette);
// Test grayscale image with alpha channel. The image should be converted
// into 32-bit ARGB format and the alpha channel should be preserved.
unis = g_utf8_to_utf16 ("test-gsa.png", -1, NULL, NULL, NULL);
status = GdipCreateBitmapFromFile (unis, &bitmap);
CHECK_STATUS(1);
g_free (unis);
status = GdipGetImagePixelFormat (bitmap, &pixel_format);
CHECK_STATUS(1);
CHECK_ASSERT(pixel_format == PixelFormat32bppARGB);
status = GdipBitmapGetPixel (bitmap, 0, 0, &color);
CHECK_STATUS(1);
CHECK_ASSERT(color == 0xffffff);
status = GdipBitmapGetPixel (bitmap, 1, 7, &color);
CHECK_STATUS(1);
CHECK_ASSERT(color == 0xe8b3b3b3);
GdipDisposeImage (bitmap);
return 0;
}
