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55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
#pragma once
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#ifndef BMP_IO_H
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#define BMP_IO_H
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#include "MMBitmap.h"
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#include "file_io.h"
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enum _BMPReadError {
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kBMPGenericError = 0,
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kBMPAccessError,
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kBMPInvalidKeyError,
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kBMPUnsupportedHeaderError,
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kBMPInvalidColorPanesError,
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kBMPUnsupportedColorDepthError,
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kBMPUnsupportedCompressionError,
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kBMPInvalidPixelDataError
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};
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typedef MMIOError MMBMPReadError;
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/* Returns description of given MMBMPReadError.
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* Returned string is constant and hence should not be freed. */
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const char *MMBMPReadErrorString(MMIOError error);
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/* Attempts to read bitmap file at path; returns new MMBitmap on success, or
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* NULL on error. If |error| is non-NULL, it will be set to the error code
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* on return.
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*
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* Currently supports:
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* - Uncompressed Windows v3/v4/v5 24-bit or 32-bit BMP.
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* - OS/2 v1 or v2 24-bit BMP.
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* - Does NOT yet support: 1-bit, 4-bit, 8-bit, 16-bit, compressed bitmaps,
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* or PNGs/JPEGs disguised as BMPs (and returns NULL if those are given).
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*
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* Responsibility for destroy()'ing returned MMBitmap is left up to caller. */
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MMBitmapRef newMMBitmapFromBMP(const char *path, MMBMPReadError *error);
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/* Returns a buffer containing the raw BMP file data in Windows v3 BMP format,
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* ready to be saved to a file. If |len| is not NULL, it will be set to the
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* number of bytes allocated in the returned buffer.
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*
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* Responsibility for free()'ing data is left up to the caller. */
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uint8_t *createBitmapData(MMBitmapRef bitmap, size_t *len);
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/* Saves bitmap to file in Windows v3 BMP format.
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* Returns 0 on success, -1 on error. */
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int saveMMBitmapAsBMP(MMBitmapRef bitmap, const char *path);
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/* Swaps bitmap from Quadrant 1 to Quadran III format, or vice versa
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* (upside-down Cartesian/PostScript/GL <-> right side up QD/CG raster format).
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*/
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void flipBitmapData(void *data, size_t width, size_t height, size_t bytewidth);
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#endif /* BMP_IO_H */
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