mirror of
https://github.com/fadden/ciderpress.git
synced 2024-11-23 11:33:58 +00:00
d35a9670b5
We weren't handling oddly sized images well. This was mostly a problem for Apple Preferred Format, PNT/$0002.
289 lines
10 KiB
C++
289 lines
10 KiB
C++
/*
|
|
* CiderPress
|
|
* Copyright (C) 2007 by faddenSoft, LLC. All Rights Reserved.
|
|
* See the file LICENSE for distribution terms.
|
|
*/
|
|
/*
|
|
* DIB (Device-Independent Bitmap) wrapper.
|
|
*
|
|
* [ Ported back from libfadden -- there's a lot of stuff here that we don't
|
|
* want or need, but it's easier to knock the bugs out if everybody is
|
|
* using roughly the same code. ]
|
|
*/
|
|
#ifndef UTIL_DIBITMAP_H
|
|
#define UTIL_DIBITMAP_H
|
|
|
|
|
|
/*
|
|
* Wraps a device-independent bitmap.
|
|
*
|
|
* When the bitmap is initially loaded, the object may or may not allocate a
|
|
* DIB section in system memory. If the DIB handle is requested, a conversion
|
|
* will be forced. This is done for efficiency in situations where the
|
|
* bitmap isn't going to be handed off to GDI, or will only be used as a DDB.
|
|
*
|
|
* Some bitmaps have a transparent color (1-bit alpha) or a full alpha
|
|
* channel. The behavior works like this:
|
|
* - If the bitmap is <= 24 bits, alpha defaults to "off".
|
|
* - If the bitmap is 32 bits, alpha defaults to "full".
|
|
* - If the app calls SetAlphaColor, alpha is set to "transparency".
|
|
* Calling GetPixelRGB returns a 32-bit value for which the alpha value
|
|
* is always set. For "none" it's always 255, for "transparency" it's
|
|
* either set to 0 or 255, and for "full" it's set to rgbReserved in a
|
|
* 32-bit bitmap (or 255 for any other value).
|
|
*/
|
|
class MyDIBitmap {
|
|
public:
|
|
typedef enum AlphaType {
|
|
kAlphaUnknown,
|
|
kAlphaOpaque, // always stuff 255 into rgbReserved
|
|
kAlphaTransparency, // single-bit alpha
|
|
kAlphaFull // alpha channel in rgbReserved
|
|
} AlphaType;
|
|
enum { kAlphaMask = 0xff000000 }; // alpha byte in an ARGB DWORD
|
|
|
|
MyDIBitmap(void) :
|
|
mhBitmap(NULL),
|
|
mpFileBuffer(NULL),
|
|
mWidth(-1),
|
|
mHeight(-1),
|
|
mBpp(-1),
|
|
mPitchBytes(0),
|
|
mNumColorsUsed(0),
|
|
mpColorTable(NULL),
|
|
mColorTableInitialized(false),
|
|
mpPixels(NULL),
|
|
mAlphaType(kAlphaOpaque),
|
|
mTransparentColor(0)
|
|
{
|
|
memset(&mBitmapInfoHdr, 0, sizeof(mBitmapInfoHdr));
|
|
}
|
|
|
|
/*
|
|
* Destroys allocated memory and delete the DIB object.
|
|
*/
|
|
virtual ~MyDIBitmap(void);
|
|
|
|
/*
|
|
* Creates a blank DIB with the requested dimensions.
|
|
*
|
|
* The DIB requires that the array of bytes defining the pixels of the
|
|
* bitmap be padded with zeroes to end on a "LONG data-type boundary",
|
|
* i.e. the start of each line must be 32-bit aligned. This is done
|
|
* automatically behind the scenes.
|
|
*
|
|
* Returns a pointer to the pixel storage on success, or NULL on failure.
|
|
*/
|
|
void* Create(int width, int height, int bitsPerPixel, int colorsUsed,
|
|
bool dibSection = false);
|
|
|
|
/*
|
|
* Set the values in the color table.
|
|
*/
|
|
void SetColorTable(const RGBQUAD* pColorTable);
|
|
|
|
const RGBQUAD* GetColorTable(void) const { return mpColorTable; }
|
|
|
|
/*
|
|
* Zero out a bitmap's pixels. Does not touch the color table.
|
|
*/
|
|
void ClearPixels(void);
|
|
|
|
/*
|
|
* Create a DDB from the current bitmap in the specified DC, and return its
|
|
* handle. The returned handle must eventually be disposed with DeleteObject.
|
|
*
|
|
* Since we're just supplying pointers to various pieces of data, there's no
|
|
* need for us to have a DIB section.
|
|
*
|
|
* Returns NULL on failure.
|
|
*/
|
|
HBITMAP ConvertToDDB(HDC dc) const;
|
|
|
|
/*
|
|
* Opens the file and call the FILE* version.
|
|
*/
|
|
int CreateFromFile(const WCHAR* fileName);
|
|
|
|
/*
|
|
* Create a DIB by reading a BMP or TGA file into memory.
|
|
*/
|
|
int CreateFromFile(FILE* fp, long len);
|
|
|
|
/*
|
|
* Creates object from a copy of the file in memory. Set "doDelete" to
|
|
* transfer ownership of object.
|
|
*
|
|
* We want to hang on to the data buffer, but if we don't own it then we
|
|
* have to make a copy.
|
|
*
|
|
* If "doDelete" is set, memory will be deleted if function fails.
|
|
*/
|
|
int CreateFromBuffer(void* buffer, long len, bool doDelete);
|
|
|
|
/*
|
|
* Creates the object from a resource embedded in the application.
|
|
*
|
|
* Use MAKEINTRESOURCE to load a resource by ordinal.
|
|
*/
|
|
void* CreateFromResource(HINSTANCE hInstance, const WCHAR* rsrc);
|
|
|
|
/*
|
|
* Write the bitmap to the named file. Opens the file and calls the FILE*
|
|
* function.
|
|
*/
|
|
int WriteToFile(const WCHAR* fileName) const;
|
|
|
|
/*
|
|
* Write the bitmap to a file.
|
|
*
|
|
* Pass in an open, seeked file pointer (make sure to use "wb" mode).
|
|
*
|
|
* Returns 0 on success, or nonzero (errno) on failure.
|
|
*/
|
|
int WriteToFile(FILE* fp) const;
|
|
|
|
// simple getters
|
|
virtual int GetWidth(void) const { return mWidth; }
|
|
virtual int GetHeight(void) const { return mHeight; }
|
|
int GetBpp(void) const { return mBpp; }
|
|
int GetNumColorsUsed(void) const { return mNumColorsUsed; }
|
|
|
|
// retrieve current alpha mode
|
|
AlphaType GetAlphaType(void) const { return mAlphaType; }
|
|
|
|
/*
|
|
* Retrieve the transparency color key, if any.
|
|
*
|
|
* Returns "false" if no color key has been set.
|
|
*/
|
|
bool GetTransparentColor(RGBQUAD* pColor) const;
|
|
|
|
/*
|
|
* Set the transparent color. Changes the alpha mode to kAlphaTransparency.
|
|
*/
|
|
void SetTransparentColor(const RGBQUAD* pColor);
|
|
|
|
/*
|
|
* Look up an RGB color in an indexed color table.
|
|
*
|
|
* Returns the index of the color, or -1 if not found (-2 on error, e.g. this
|
|
* isn't an indexed-color bitmap or the color table hasn't been created).
|
|
*/
|
|
int LookupColor(const RGBQUAD* pRgbQuad);
|
|
|
|
// set/get individual pixel values; the "RGB" functions always set
|
|
// alpha to zero, while "RGBA" follow the current alpha mode
|
|
|
|
void FASTCALL GetPixelRGB(int x, int y, RGBQUAD* pRgbQuad) const;
|
|
void FASTCALL SetPixelRGB(int x, int y, const RGBQUAD* pRgbQuad);
|
|
void FASTCALL GetPixelRGBA(int x, int y, RGBQUAD* pRgbQuad) const;
|
|
void FASTCALL SetPixelRGBA(int x, int y, const RGBQUAD* pRgbQuad);
|
|
void FASTCALL GetPixelIndex(int x, int y, int* pIdx) const;
|
|
void FASTCALL SetPixelIndex(int x, int y, int idx);
|
|
|
|
// Return a pointer to the raw pixel storage.
|
|
void* GetPixelBuf(void) const { return mpPixels; }
|
|
|
|
// Return the DIB handle; keep in mind that this HBITMAP is different
|
|
// from a DDB HBITMAP, and many calls that take an HBITMAP will fail.
|
|
HBITMAP GetHandle(void) {
|
|
if (mhBitmap == NULL && mpFileBuffer != NULL)
|
|
ConvertBufToDIBSection();
|
|
return mhBitmap;
|
|
}
|
|
|
|
int GetPitch(void) const { return mPitchBytes; }
|
|
|
|
/*
|
|
* Blit a block of pixels from one bitmap to another.
|
|
*
|
|
* The bitmaps must share a common format, and the rectangles must be the
|
|
* same size. We could implement color conversion and resizing here, but
|
|
* for now let's not.
|
|
*/
|
|
static bool Blit(MyDIBitmap* pDstBits, const RECT* pDstRect,
|
|
const MyDIBitmap* pSrcBits, const RECT* pSrcRect);
|
|
|
|
private:
|
|
DECLARE_COPY_AND_OPEQ(MyDIBitmap)
|
|
|
|
enum { kBMPMagic = 0x4d42 }; // "BM"
|
|
|
|
/* for .TGA files; does not map directly to file */
|
|
typedef struct TargaHeader {
|
|
unsigned char idLength;
|
|
unsigned char colorMapType;
|
|
unsigned char imageType;
|
|
unsigned short colorMapOrigin;
|
|
unsigned short colorMapLen;
|
|
unsigned char colorMapEntryLen;
|
|
unsigned short xOffset;
|
|
unsigned short yOffset;
|
|
unsigned short width;
|
|
unsigned short height;
|
|
unsigned char bitsPerPixel;
|
|
unsigned char imageDescriptor;
|
|
} TargaHeader;
|
|
enum {
|
|
kTargaHeaderLen = 18,
|
|
kTargaUnmappedRGB = 2, // for imageType field
|
|
};
|
|
|
|
/*
|
|
* Set up internal structures for the BMP file.
|
|
*
|
|
* On error, "vbuf" is discarded.
|
|
*/
|
|
int ImportBMP(void* vbuf, long len);
|
|
|
|
/*
|
|
* Set up internal structures for the TGA file.
|
|
*
|
|
* We handle 16-, 24-, and 32-bit .TGA files only. They happen to use the
|
|
* same byte layout as BMP files, so we do very little work here. If we
|
|
* tried to write the raw data to a BMP file we could end up in trouble,
|
|
* because we don't force the "pitch must be multiple of 4 bytes" rule.
|
|
*
|
|
* On error, "vbuf" is discarded.
|
|
*/
|
|
int ImportTGA(void* vbuf, long len);
|
|
|
|
/*
|
|
* If the bitmap wasn't initially created as a DIB section, transform it now
|
|
* so the application can use it in GDI calls.
|
|
*
|
|
* Returns 0 on success, -1 on error.
|
|
*/
|
|
int ConvertBufToDIBSection(void);
|
|
|
|
/*
|
|
* Create object from a buffer of new[]-created memory that we own.
|
|
*
|
|
* The memory will be discarded if this function fails.
|
|
*
|
|
* We don't want to create a DIB section if the eventual user of this data
|
|
* doesn't need it (e.g. it's just getting converted into a 3D texture
|
|
* without using any GDI calls), so we just leave the pixels in the file
|
|
* buffer for now.
|
|
*/
|
|
int CreateFromNewBuffer(void* vbuf, long len);
|
|
|
|
BITMAPINFOHEADER mBitmapInfoHdr;
|
|
/* either mhBitmap or mpFileContents will be non-NULL, but not both */
|
|
HBITMAP mhBitmap; // DIB section handle, not DDB
|
|
void* mpFileBuffer; // buffer with contents of .BMP
|
|
int mWidth;
|
|
int mHeight;
|
|
int mBpp; // #of bits per pixel
|
|
int mPitchBytes; // memory line pitch, in bytes
|
|
int mNumColorsUsed;
|
|
RGBQUAD* mpColorTable;
|
|
bool mColorTableInitialized;
|
|
void* mpPixels; // points to system-allocated mem
|
|
AlphaType mAlphaType;
|
|
DWORD mTransparentColor; // for single-bit alpha bitmaps
|
|
};
|
|
|
|
#endif /*UTIL_DIBITMAP_H*/
|