C++ FreeImage_GetBPP函数代码示例

		GLubyte* Texture::loadToBitmap(std::string path, bool flip)
		{
			const char* pathCStr = path.c_str();

			FREE_IMAGE_FORMAT format = FIF_UNKNOWN;
			format = FreeImage_GetFileType(pathCStr);
			if (format == FIF_UNKNOWN)
				format = FreeImage_GetFIFFromFilename(pathCStr);
			if (format == FIF_UNKNOWN) {
				std::cout << "Failed to load image at " << pathCStr << std::endl;
				return nullptr;
			}
			if (!FreeImage_FIFSupportsReading(format))
			{
				std::cout << "Detected image format cannot be read! " << pathCStr << std::endl;
				return nullptr;
			}

			m_bitmap = FreeImage_Load(format, pathCStr);
			if (flip)
				FreeImage_FlipVertical(m_bitmap);

			GLint bitsPerPixel = FreeImage_GetBPP(m_bitmap);
			if (bitsPerPixel == 32)
				m_bitmap32 = m_bitmap;
			else
				m_bitmap32 = FreeImage_ConvertTo32Bits(m_bitmap);

			m_width = FreeImage_GetWidth(m_bitmap32);
			m_height = FreeImage_GetHeight(m_bitmap32);

			return FreeImage_GetBits(m_bitmap32);
		}

void TextureLoader::load(GLuint* tex_name, FREE_IMAGE_FORMAT fif, const char* file)
{
	FIBITMAP* image = FreeImage_Load(fif, file);

	int tex_width = FreeImage_GetWidth(image);
	int tex_height = FreeImage_GetHeight(image);


	glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

	glGenTextures(1, tex_name);
	glBindTexture(GL_TEXTURE_2D, *tex_name);

	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);

	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_DECAL);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_DECAL);

	//printf("BPP: %d\n", FreeImage_GetBPP(image));
	
	int bpp = FreeImage_GetBPP(image) / 8;

	GLenum format = GL_RGBA;

	if(bpp == 3)
		format = GL_RGB;

	gluBuild2DMipmaps(GL_TEXTURE_2D, bpp, tex_width, tex_height, format, GL_UNSIGNED_BYTE, FreeImage_GetBits(image));
}

	Texture::Texture(const char* file) {
		FREE_IMAGE_FORMAT fif = FIF_UNKNOWN;
		FIBITMAP* dib = nullptr;
		fif = FreeImage_GetFileType(file, 0);
		if (fif == FIF_UNKNOWN)
			fif = FreeImage_GetFIFFromFilename(file);
		if (fif != FIF_UNKNOWN) {
			if (FreeImage_FIFSupportsReading(fif))
				dib = FreeImage_Load(fif, file);
			BYTE* pixels = FreeImage_GetBits(dib);
			int width = FreeImage_GetWidth(dib);
			int height = FreeImage_GetHeight(dib);
			int bits = FreeImage_GetBPP(dib);
			int size = width * height * (bits / 8);
			BYTE* result = new BYTE[size];
			memcpy(result, pixels, size);
			FreeImage_Unload(dib);

			glGenTextures(1, &m_ID);
			glBindTexture(GL_TEXTURE_2D, m_ID);
			glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, result ? result : NULL);
			glBindTexture(GL_TEXTURE_2D, 0);
		}
		else {
			m_ID = -1;
		}
	}

/**
 * Helper to encapsulate Bpp conversion using FreeImage, taking into consideration color type. Creates a new bitmap if needed. Can return the same one.
 * @param pHandle		FIBITMAP as defined by the Freeimage library.
 * @param pNewBpp		the new bpp that the supplied FIBITMAP is to be coverted to.
 */
FIBITMAP* FreeImageHelper::convertBpp(FIBITMAP* pHandle, int pNewBpp) {	
	//Convert the bit depth
	FIBITMAP *converted = NULL;
	
	//Convert Bpp only if needed
	if (pNewBpp != static_cast<int>(FreeImage_GetBPP(pHandle))) {
		//Transform bpp to the pixel format
		switch (pNewBpp) {
			case (4):
				converted = FreeImage_ConvertTo4Bits(pHandle);
				break;
			case (8):
				converted = FreeImage_ConvertTo8Bits(pHandle);
				break;
			case(16):
				converted = FreeImage_ConvertTo16Bits565(pHandle);  //There's option of 16Bits555. But leaves unused bits. Chosen 565 because it's most common
				break;
			case(24):
			   converted = FreeImage_ConvertTo24Bits(pHandle);    
			    break;
			case(32): {
			    converted = FreeImage_ConvertTo32Bits (pHandle); 
				}
			    break;
			default:
				converted = NULL;
				break;
		}
	} else {
		//No change, just set 'converted' handle to current one
		converted = pHandle;
	}

	return converted;
}

/**
 * Freeimage format to Indielib format.
 * @param pHandle		the FIBITMAP that is used for calculation
 */
int FreeImageHelper::calculateINDFormat(FIBITMAP* pHandle) {

	FREE_IMAGE_TYPE imgType = FreeImage_GetImageType(pHandle);

	//Bitmap type (most common)
	if (FIT_BITMAP == imgType) {
		//Depending on the freeimage color type analysis, we determine our IND_ColorFormat
		FREE_IMAGE_COLOR_TYPE colorType = FreeImage_GetColorType(pHandle);

		
			
		if (FIC_MINISBLACK == colorType || FIC_MINISWHITE == colorType) {
			return IND_LUMINANCE;
		} else if (FIC_PALETTE == colorType) {
			return IND_COLOUR_INDEX;
		} else if (FIC_RGB == colorType) {
			//HACK: This is because when converting to 32 bits, even though there is alpha channel,
			//the color analysis function returns FIC_RGB, as alpha is opaque. We rely on that to know
			//if we have alpha channel so it's not good.
			if (FreeImage_GetBPP(pHandle) == 32) {
				return IND_RGBA;
			} else {
				return IND_RGB;
			}
		} else if (FIC_RGBALPHA == colorType) {
			return IND_RGBA;
		}
	}

	//TODO: OTHER IMAGE TYPES

	//Failure
	return IND_UNKNOWN;
}

static void
TestFIA_IO(CuTest* tc)
{
	FIBITMAP *dib1 = NULL, *dib2 = NULL;
	FREE_IMAGE_TYPE type;
	int bpp, err;
    
    const char *file = TEST_DATA_DIR "001.tif";
	dib1 = FIA_LoadFIBFromFile(file);

	CuAssertTrue(tc, dib1 != NULL);

	bpp = FreeImage_GetBPP(dib1);
	type = FreeImage_GetImageType(dib1);

	CuAssertTrue(tc, bpp == 24);
	CuAssertTrue(tc, type == FIT_BITMAP);
	
	err = FIA_SaveFIBToFile (dib1, TEST_DATA_OUTPUT_DIR "/IO/save-colour-test.bmp", BIT8);

	CuAssertTrue(tc, err == FIA_SUCCESS);

	dib2 = FIA_LoadFIBFromFile(TEST_DATA_OUTPUT_DIR "/IO/save-colour-test.bmp");

	err = FIA_BitwiseCompare(dib1, dib2);

	FreeImage_Unload(dib1);
	FreeImage_Unload(dib2);
}

	bitmap_ptr finalize(bool showProgress = true) {
		if (chunks.empty()) {
			return nullptr;
		}
		if (showProgress) {
			std::cout << "Adding all accepted chunks to the final image\n";
		}
		
		const auto it = chunks.begin();
		bitmap_ptr firstChunk = GenericLoader(*it);
		
		auto currentHeight = 0;

		const auto type = FreeImage_GetImageType(firstChunk.get());
		
		const auto bpp = FreeImage_GetBPP(firstChunk.get());
		
		bitmap_ptr finalImage(FreeImage_AllocateT(type, width, height, bpp));

		auto RGBChunkWorker = [=, &finalImage, &currentHeight](const std::string& el)
		{
			bitmap_ptr chunk = GenericLoader(el);
			auto chunkHeight = FreeImage_GetHeight(chunk.get());
			auto chunk_img = FreeImage_Copy(chunk.get(), 0, 0, this->width, chunkHeight);
			if (chunk_img) {
				FreeImage_Paste(finalImage.get(), chunk_img, 0, currentHeight, 256);
			}
			currentHeight += chunkHeight;
		};

		std::for_each(chunks.begin(), chunks.end(), RGBChunkWorker);
		return finalImage;
	}

void
FreeImageStack::loadImage(unsigned int iSlice, npp::ImageNPP_8u_C1 & rImage)
const
{
    NPP_ASSERT_MSG(iSlice < slices(), "Slice index exceeded number of slices in stack.");
    FIBITMAP * pBitmap = FreeImage_LockPage(pImageStack_, iSlice);
    NPP_ASSERT_NOT_NULL(pBitmap);
            // make sure this is an 8-bit single channel image
    NPP_DEBUG_ASSERT(FreeImage_GetColorType(pBitmap) == FIC_MINISBLACK);
    NPP_DEBUG_ASSERT(FreeImage_GetBPP(pBitmap) == 8);
    
    NPP_DEBUG_ASSERT(FreeImage_GetWidth(pBitmap) == nWidth_);
    NPP_DEBUG_ASSERT(FreeImage_GetHeight(pBitmap) == nHeight_);
    unsigned int    nSrcPitch = FreeImage_GetPitch(pBitmap);
    unsigned char * pSrcData  = FreeImage_GetBits(pBitmap);
    
    if (rImage.width() == nWidth_ && rImage.height() == nHeight_)
    {
        NPP_CHECK_CUDA(cudaMemcpy2D(rImage.data(), rImage.pitch(), pSrcData, nSrcPitch, 
                                    nWidth_, nHeight_, cudaMemcpyHostToDevice));
    }
    else
    {
                // create new NPP image
        npp::ImageNPP_8u_C1 oImage(nWidth_, nHeight_);
                // transfer slice data into new device image
        NPP_CHECK_CUDA(cudaMemcpy2D(oImage.data(), oImage.pitch(), pSrcData, nSrcPitch, 
                                    nWidth_, nHeight_, cudaMemcpyHostToDevice));
                // swap the result image with the reference passed into this method
        rImage.swap(oImage);
    }
                // release locked slice
    FreeImage_UnlockPage(pImageStack_, pBitmap, FALSE);
}

FIBITMAP* DLL_CALLCONV
FIA_ShiftImageEdgeToCenter(FIBITMAP *src)
{
	int width = FreeImage_GetWidth(src);
	int height = FreeImage_GetHeight(src);
	int xhalf = (width / 2);
	int yhalf = (height / 2);
	int bytes_pp = FreeImage_GetBPP(src) / 8;
	int xhalf_bytes = xhalf * bytes_pp;

	//std::cout << "width " << width << std::endl;
	//std::cout << "xhalf " << xhalf << std::endl;
	
	FIBITMAP *dst = FIA_CloneImageType(src, width, height);

	for(int y=0; y < yhalf; y++) { 
		
		BYTE* srcbits = (BYTE *) FIA_GetScanLineFromTop(src, y);
		BYTE* outbits = (BYTE *) FIA_GetScanLineFromTop(dst, y + yhalf);

		memcpy(outbits + xhalf_bytes, srcbits, xhalf_bytes);
		memcpy(outbits, srcbits + xhalf_bytes, xhalf_bytes);
	}

	for(int y=yhalf; y < height; y++) { 
		
		BYTE* srcbits = (BYTE *) FIA_GetScanLineFromTop(src, y);
		BYTE* outbits = (BYTE *) FIA_GetScanLineFromTop(dst, y - yhalf);

		memcpy(outbits + xhalf_bytes, srcbits, xhalf_bytes);
		memcpy(outbits, srcbits + xhalf_bytes, xhalf_bytes);
	}

	return dst;
}

/**
Invert only color components, skipping Alpha/Black
(Can be useful as public/utility function)
*/
static
BOOL invertColor(FIBITMAP* dib) {
	FREE_IMAGE_TYPE type = FreeImage_GetImageType(dib);
	const unsigned Bpp = FreeImage_GetBPP(dib)/8;
	
	if((type == FIT_BITMAP && Bpp == 4) || type == FIT_RGBA16) {
		const unsigned width = FreeImage_GetWidth(dib);
		const unsigned height = FreeImage_GetHeight(dib);
		BYTE *line_start = FreeImage_GetScanLine(dib, 0);
		const unsigned pitch = FreeImage_GetPitch(dib);
		const unsigned triBpp = Bpp - (Bpp == 4 ? 1 : 2);
				
		for(unsigned y = 0; y < height; y++) {
			BYTE *line = line_start;

			for(unsigned x = 0; x < width; x++) {
				for(unsigned b=0; b < triBpp; ++b) {
					line[b] = ~line[b];
				}
					
				line += Bpp;
			}
			line_start += pitch;
		}
		
		return TRUE;
	}
	else {
		return FreeImage_Invert(dib);
	}
}

HBITMAP BmpFilterLoadBitmap(BOOL *bIsTransparent, const wchar_t *ptszFilename)
{
	FIBITMAP *dib = (FIBITMAP*)Image_Load(ptszFilename, IMGL_RETURNDIB);
	if (dib == nullptr)
		return nullptr;

	FIBITMAP *dib32 = nullptr;
	if (FreeImage_GetBPP(dib) != 32) {
		dib32 = FreeImage_ConvertTo32Bits(dib);
		FreeImage_Unload(dib);
	}
	else dib32 = dib;

	if (dib32 == nullptr)
		return nullptr;

	if (FreeImage_IsTransparent(dib32))
		if (bIsTransparent)
			*bIsTransparent = TRUE;

	if (FreeImage_GetWidth(dib32) > 128 || FreeImage_GetHeight(dib32) > 128) {
		FIBITMAP *dib_new = FreeImage_MakeThumbnail(dib32, 128, FALSE);
		FreeImage_Unload(dib32);
		if (dib_new == nullptr)
			return nullptr;
		dib32 = dib_new;
	}

	HBITMAP bitmap = FreeImage_CreateHBITMAPFromDIB(dib32);
	FreeImage_Unload(dib32);
	FreeImage_CorrectBitmap32Alpha(bitmap, FALSE);
	return bitmap;
}

template<class Tdst, class Tsrc> FIBITMAP* 
CONVERT_TYPE<Tdst, Tsrc>::convert(FIBITMAP *src, FREE_IMAGE_TYPE dst_type) {

	FIBITMAP *dst = NULL;

	unsigned width	= FreeImage_GetWidth(src);
	unsigned height = FreeImage_GetHeight(src);
	unsigned bpp	= FreeImage_GetBPP(src);

	// allocate dst image

	dst = FreeImage_AllocateT(dst_type, width, height, bpp, 
			FreeImage_GetRedMask(src), FreeImage_GetGreenMask(src), FreeImage_GetBlueMask(src));
	if(!dst) return NULL;

	// convert from src_type to dst_type
	
	for(unsigned y = 0; y < height; y++) {
		const Tsrc *src_bits = reinterpret_cast<Tsrc*>(FreeImage_GetScanLine(src, y));
		Tdst *dst_bits = reinterpret_cast<Tdst*>(FreeImage_GetScanLine(dst, y));

		for(unsigned x = 0; x < width; x++) {
			*dst_bits++ = static_cast<Tdst>(*src_bits++);
		}
	}

	return dst;
}

BOOL DLL_CALLCONV
FreeImage_GetBackgroundColor(FIBITMAP *dib, RGBQUAD *bkcolor) {
	if(dib && bkcolor) {
		if(FreeImage_HasBackgroundColor(dib)) {
			// get the background color
			RGBQUAD *bkgnd_color = &((FREEIMAGEHEADER *)dib->data)->bkgnd_color;
			memcpy(bkcolor, bkgnd_color, sizeof(RGBQUAD));
			// get the background index
			if(FreeImage_GetBPP(dib) == 8) {
				RGBQUAD *pal = FreeImage_GetPalette(dib);
				for(unsigned i = 0; i < FreeImage_GetColorsUsed(dib); i++) {
					if(bkgnd_color->rgbRed == pal[i].rgbRed) {
						if(bkgnd_color->rgbGreen == pal[i].rgbGreen) {
							if(bkgnd_color->rgbBlue == pal[i].rgbBlue) {
								bkcolor->rgbReserved = (BYTE)i;
								return TRUE;
							}
						}
					}
				}
			}

			bkcolor->rgbReserved = 0;

			return TRUE;
		}
	}

	return FALSE;
}

std::shared_ptr<FIBITMAP> load_image(const std::wstring& filename)
{
	if(!boost::filesystem::exists(filename))
		BOOST_THROW_EXCEPTION(file_not_found() << boost::errinfo_file_name(narrow(filename)));

	FREE_IMAGE_FORMAT fif = FIF_UNKNOWN;
	fif = FreeImage_GetFileTypeU(filename.c_str(), 0);
	if(fif == FIF_UNKNOWN) 
		fif = FreeImage_GetFIFFromFilenameU(filename.c_str());
		
	if(fif == FIF_UNKNOWN || !FreeImage_FIFSupportsReading(fif)) 
		BOOST_THROW_EXCEPTION(invalid_argument() << msg_info("Unsupported image format."));
		
	auto bitmap = std::shared_ptr<FIBITMAP>(FreeImage_LoadU(fif, filename.c_str(), 0), FreeImage_Unload);
		  
	if(FreeImage_GetBPP(bitmap.get()) != 32)
	{
		bitmap = std::shared_ptr<FIBITMAP>(FreeImage_ConvertTo32Bits(bitmap.get()), FreeImage_Unload);
		if(!bitmap)
			BOOST_THROW_EXCEPTION(invalid_argument() << msg_info("Unsupported image format."));			
	}

	//PNG-images need to be premultiplied with their alpha
	if(fif == FIF_PNG)
	{
		image_view<bgra_pixel> original_view(FreeImage_GetBits(bitmap.get()), FreeImage_GetWidth(bitmap.get()), FreeImage_GetHeight(bitmap.get()));
		premultiply(original_view);
	}
	
	return bitmap;
}

static void
TestFIA_ColourTextTest(CuTest* tc)
{
    const char *file = TEST_DATA_DIR "fly.bmp";
	int bpp;

    FIBITMAP *src = FIA_LoadFIBFromFile(file);
    CuAssertTrue(tc, src != NULL);
    
    FIBITMAP *dst = FreeImage_ConvertTo24Bits(src);

    FIA_DrawHorizontalColourText (dst, 10, 10, FIA_AGG_FONT_VERDANA_12_BOLD, "A quick brown fox jumps over the lazy dog 0123456789", FIA_RGBQUAD(0, 255, 0));
    FIA_DrawHorizontalColourText (dst, 10, 40, FIA_AGG_FONT_VERDANA_16, "A quick brown fox jumps over the lazy dog 0123456789", FIA_RGBQUAD(0, 0, 255));
    FIA_DrawHorizontalColourText (dst, 10, 60, FIA_AGG_FONT_GSE_8x16_BOLD, "A quick brown fox jumps over the lazy dog 0123456789", FIA_RGBQUAD(0, 255, 255));
	FIA_DrawHorizontalColourText (dst, 1000, 600, FIA_AGG_FONT_GSE_8x16_BOLD, "A quick brown fox jumps over the lazy dog 0123456789", FIA_RGBQUAD(0, 255, 255));
	FIA_DrawHorizontalColourText (dst, -500, -600, FIA_AGG_FONT_GSE_8x16_BOLD, "A quick brown fox jumps over the lazy dog 0123456789", FIA_RGBQUAD(0, 255, 255));
	FIA_DrawHorizontalColourText (dst, 0, 200, FIA_AGG_FONT_GSE_8x16_BOLD, "A quick brown fox jumps over the lazy dog 0123456789", FIA_RGBQUAD(0, 255, 255));
	FIA_DrawHorizontalColourText (dst, 0, 300, FIA_AGG_FONT_GSE_8x16_BOLD, "A quick brown fox jumps over the lazy dog 0123456789", FIA_RGBQUAD(0, 255, 255));

	bpp = FreeImage_GetBPP(dst);

    CuAssertTrue(tc, dst != NULL);

    FIA_SaveFIBToFile(dst, TEST_DATA_OUTPUT_DIR "Drawing/TestFIA_ColourTextTest.bmp", BIT24);

    FreeImage_Unload(src);
    FreeImage_Unload(dst);
}