Bitmap.h

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/** @file Bitmap.h
 *  @brief Defines bitmap format helper for textures
 *
 * Used for file formats which embed their textures into the model file.
 */

#ifndef AI_BITMAP_H_INC
#define AI_BITMAP_H_INC

namespace Assimp {

class Bitmap {

	protected:

		struct Header {

			uint16_t type;

			uint32_t size;

			uint16_t reserved1;

			uint16_t reserved2;

			uint32_t offset;

			// We define the struct size because sizeof(Header) might return a wrong result because of structure padding.
			// Moreover, we must use this ugly and error prone syntax because Visual Studio neither support constexpr or sizeof(name_of_field).
			static const std::size_t header_size =
				sizeof(uint16_t) + // type
				sizeof(uint32_t) + // size
				sizeof(uint16_t) + // reserved1
				sizeof(uint16_t) + // reserved2
				sizeof(uint32_t);  // offset

		};

		struct DIB {

			uint32_t size;

			int32_t width;

			int32_t height;

			uint16_t planes;

			uint16_t bits_per_pixel;

			uint32_t compression;

			uint32_t image_size;

			int32_t x_resolution;

			int32_t y_resolution;

			uint32_t nb_colors;

			uint32_t nb_important_colors;

			// We define the struct size because sizeof(DIB) might return a wrong result because of structure padding.
			// Moreover, we must use this ugly and error prone syntax because Visual Studio neither support constexpr or sizeof(name_of_field).
			static const std::size_t dib_size =
				sizeof(uint32_t) + // size
				sizeof(int32_t) +  // width
				sizeof(int32_t) +  // height
				sizeof(uint16_t) + // planes
				sizeof(uint16_t) + // bits_per_pixel
				sizeof(uint32_t) + // compression
				sizeof(uint32_t) + // image_size
				sizeof(int32_t) +  // x_resolution
				sizeof(int32_t) +  // y_resolution
				sizeof(uint32_t) + // nb_colors
				sizeof(uint32_t);  // nb_important_colors

		};

		static const std::size_t mBytesPerPixel = 4;

	public:

		static void Save(aiTexture* texture, IOStream* file);

	protected:

		static void WriteHeader(Header& header, IOStream* file);

		static void WriteDIB(DIB& dib, IOStream* file);

		static void WriteData(aiTexture* texture, IOStream* file);

};

}

#endif // AI_BITMAP_H_INC