gecko-dev/gfx/public/nsIImage.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#ifndef nsIImage_h___
#define nsIImage_h___
#include "nsISupports.h"
#include "nsRect.h"
#include "nsIRenderingContext.h"
typedef struct
{
//I lifted this from the image lib. The difference is that
//this uses nscolor instead of NI_RGB. Multiple color pollution
//is a bad thing. MMP
PRInt32 NumColors; // Number of colors in the colormap.
// A negative value can be used to denote a
// possibly non-unique set.
//nscolor *Map; // Colormap colors.
PRUint8 *Index; // NULL, if map is in index order, otherwise
// specifies the indices of the map entries. */
} nsColorMap;
typedef enum {
nsMaskRequirements_kNoMask,
nsMaskRequirements_kNeeds1Bit,
nsMaskRequirements_kNeeds8Bit
} nsMaskRequirements;
#define nsImageUpdateFlags_kColorMapChanged 0x1
#define nsImageUpdateFlags_kBitsChanged 0x2
// IID for the nsIImage interface
#define NS_IIMAGE_IID \
{ 0x0b4faaa0, 0xaa3a, 0x11d1, \
{ 0xa8, 0x24, 0x00, 0x40, 0x95, 0x9a, 0x28, 0xc9 } }
// Interface to Images
class nsIImage : public nsISupports
{
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public:
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/**
* Build and initialize the nsIImage
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* @param aWidth The width in pixels of the desired pixelmap
* @param aHeight The height in pixels of the desired pixelmap
* @param aDepth The number of bits per pixel for the pixelmap
* @param aMaskRequirements A flag indicating if a alpha mask should be allocated
*/
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virtual nsresult Init(PRInt32 aWidth, PRInt32 aHeight, PRInt32 aDepth, nsMaskRequirements aMaskRequirements) = 0;
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/**
* Get the number of bytes per pixel for this image
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* @update - dwc 2/3/99
* @return - the number of bytes per pixel
*/
virtual PRInt32 GetBytesPix() = 0;
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/**
* Get the width for the pixelmap
* @update - dwc 2/1/99
* @return The width in pixels for the pixelmap
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*/
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virtual PRInt32 GetWidth() = 0;
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/**
* Get the height for the pixelmap
* @update - dwc 2/1/99
* @return The height in pixels for the pixelmap
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*/
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virtual PRInt32 GetHeight() = 0;
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/**
* Get a pointer to the bits for the pixelmap, only if it is not optimized
* @update - dwc 2/1/99
* @return address of the DIB pixel array
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*/
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virtual PRUint8 * GetBits() = 0;
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/**
* Get the number of bytes needed to get to the next scanline for the pixelmap
* @update - dwc 2/1/99
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@return The number of bytes in each scanline
*/
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virtual PRInt32 GetLineStride() = 0;
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/**
* Get a pointer to the bits for the alpha mask
* @update - dwc 2/1/99
* @return address of the alpha mask pixel array
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*/
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virtual PRUint8 * GetAlphaBits() = 0;
/**
* Get the width of the alpha mask
* @update - dwc 2/1/99
* @return The width in pixels
*/
virtual PRInt32 GetAlphaWidth() = 0;
/**
* Get the height of the alpha mask
* @update - dwc 2/1/99
* @return The width in pixels
*/
virtual PRInt32 GetAlphaHeight() = 0;
/**
* Get the number of bytes per scanline for the alpha mask
* @update - dwc 2/1/99
* @return The number of bytes in each scanline
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*/
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virtual PRInt32 GetAlphaLineStride() = 0;
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/**
* Update the nsIImage color table
* @update - dwc 2/1/99
* @param aFlags Used to pass in parameters for the update
* @param aUpdateRect The rectangle to update
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*/
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virtual void ImageUpdated(nsIDeviceContext *aContext, PRUint8 aFlags, nsRect *aUpdateRect) = 0;
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/**
* Returns if the pixelmap has been converted to an optimized pixelmap
* @update - dwc 2/1/99
* @return If true, it is optimized
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*/
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virtual PRBool IsOptimized() = 0;
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/**
* Converted this pixelmap to an optimized pixelmap for the device
* @update - dwc 2/1/99
* @param aContext The device to optimize for
* @return the result of the operation, if NS_OK, then the pixelmap is optimized
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*/
virtual nsresult Optimize(nsIDeviceContext* aContext) = 0;
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/**
* Get the colormap for the nsIImage
* @update - dwc 2/1/99
* @return if non null, the colormap for the pixelmap,otherwise the image is not color mapped
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*/
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virtual nsColorMap * GetColorMap() = 0;
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/**
* BitBlit the nsIImage to a device, the source can be scaled to the dest
* @update - dwc 2/1/99
* @param aSurface the surface to blit to
* @param aX The destination horizontal location
* @param aY The destination vertical location
* @param aWidth The destination width of the pixelmap
* @param aHeight The destination height of the pixelmap
* @return if TRUE, no errors
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*/
NS_IMETHOD Draw(nsIRenderingContext &aContext, nsDrawingSurface aSurface, PRInt32 aX, PRInt32 aY, PRInt32 aWidth, PRInt32 aHeight) = 0;
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/**
* BitBlit the nsIImage to a device, the source and dest can be scaled
* @update - dwc 2/1/99
* @param aSurface the surface to blit to
* @param aSX The source width of the pixelmap
* @param aSY The source vertical location
* @param aSWidth The source width of the pixelmap
* @param aSHeight The source height of the pixelmap
* @param aDX The destination horizontal location
* @param aDY The destination vertical location
* @param aDWidth The destination width of the pixelmap
* @param aDHeight The destination height of the pixelmap
* @return if TRUE, no errors
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*/
NS_IMETHOD Draw(nsIRenderingContext &aContext, nsDrawingSurface aSurface, PRInt32 aSX, PRInt32 aSY, PRInt32 aSWidth, PRInt32 aSHeight,
PRInt32 aDX, PRInt32 aDY, PRInt32 aDWidth, PRInt32 aDHeight) = 0;
/**
* Set the alpha level for the image
* @update - dwc 2/1/99
* @param the alpha level to set for the image, from 0 to 100%
*/
virtual void SetAlphaLevel(PRInt32 aAlphaLevel) = 0;
/**
* Get the alpha level for the image
* @update - dwc 2/1/99
* @return the alpha level for the image, from 0 to 100%
*/
virtual PRInt32 GetAlphaLevel() = 0;
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/**
* Return information about the bits for this structure
* @update - dwc 2/1/99
* @return a bitmap info structure for the Device Dependent Bits
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*/
virtual void* GetBitInfo() = 0;
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//get the color space metrics for this image
//virtual NI_ColorSpec * GetColorSpec() = 0; fix
//get the color which should be considered transparent.
//if this image is color mapped, this value will be an
//index into the color map. hokey? yes, but it avoids
//another silly api or struct.
//virtual nscolor GetTransparentColor() = 0; fix.
};
//change notification API flag bits
#define NS_IMAGE_UPDATE_COLORMAP 1
#define NS_IMAGE_UPDATE_PIXELS 2
#define NS_IMAGE_UPDATE_ALPHA 4
#endif