bool readImage(SImage& image, MemChunk& data, int index)
{
// Get image info
SImage::info_t info;
FIBITMAP* bm = getFIInfo(data, info);
// Check it created/read ok
if (!bm)
{
Global::error = "Unable to read image data (unsupported format?)";
return false;
}
// Get image palette if it exists
RGBQUAD* bm_pal = FreeImage_GetPalette(bm);
Palette8bit palette;
if (bm_pal)
{
int a = 0;
int b = FreeImage_GetColorsUsed(bm);
if (b > 256)
b = 256;
for (; a < b; a++)
palette.setColour(a, rgba_t(bm_pal[a].rgbRed, bm_pal[a].rgbGreen, bm_pal[a].rgbBlue, 255));
}
// Create image
if (info.has_palette)
image.create(info, &palette);
else
image.create(info);
uint8_t* img_data = imageData(image);
// Convert to 32bpp & flip vertically
FIBITMAP* rgba = FreeImage_ConvertTo32Bits(bm);
FreeImage_FlipVertical(rgba);
// Load raw RGBA data
uint8_t* bits_rgba = FreeImage_GetBits(rgba);
int c = 0;
for (int a = 0; a < info.width * info.height; a++)
{
img_data[c++] = bits_rgba[a * 4 + 2]; // Red
img_data[c++] = bits_rgba[a * 4 + 1]; // Green
img_data[c++] = bits_rgba[a * 4]; // Blue
img_data[c++] = bits_rgba[a * 4 + 3]; // Alpha
}
// Free memory
FreeImage_Unload(rgba);
FreeImage_Unload(bm);
return true;
}
/* SImage::shrinkPalette
* Shifts all the used colours to the beginning of the palette
*******************************************************************/
void SImage::shrinkPalette(Palette8bit* pal)
{
// If the picture is not paletted, stop.
if (type != PALMASK)
return;
// Get palette to use
if (has_palette || !pal)
pal = &palette;
// Init variables
Palette8bit newpal;
bool* usedcolours = new bool[256];
int* remap = new int[256];
memset(usedcolours, 0, 256);
size_t used = 0;
// Count all color indices actually used on the picture
for (int a = 0; a < width*height; ++a)
{
usedcolours[data[a]] = true;
}
// Create palette remapping information
for (size_t b = 0; b < 256; ++b)
{
if (usedcolours[b])
{
newpal.setColour(used, pal->colour(b));
remap[b] = used;
++used;
}
}
// Remap image to new palette indices
for (int c = 0; c < width*height; ++c)
{
data[c] = remap[data[c]];
}
pal->copyPalette(&newpal);
// Cleanup
delete[] usedcolours;
delete[] remap;
}
