102 lines
3.5 KiB
C++
102 lines
3.5 KiB
C++
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// ImageComposingCallback
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// Declares the cImageComposingCallback class that implements a subset of cCallback for composing per-region images
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#pragma once
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#include "Callback.h"
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/** Implements the plumbing for composing per-region images from multiple chunks.
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To use this class, create a descendant that writes the image data using
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SetPixel() or SetPixelURow() functions.
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For the purpose of this class the image data is indexed U (horz) * V (vert), to avoid confusion with other coords.
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The image is a 32bpp raw imagedata, written into a BMP file.
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*/
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class cImageComposingCallback :
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public cCallback
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{
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public:
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enum
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{
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INVALID_REGION_COORD = 99999, ///< Used for un-assigned region coords
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IMAGE_WIDTH = 32 * 16,
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IMAGE_HEIGHT = 32 * 16,
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PIXEL_COUNT = IMAGE_WIDTH * IMAGE_HEIGHT, ///< Total pixel count of the image data
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} ;
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cImageComposingCallback(const AString & a_FileNamePrefix);
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virtual ~cImageComposingCallback();
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// cCallback overrides:
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virtual bool OnNewRegion(int a_RegionX, int a_RegionZ) override;
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virtual void OnRegionFinished(int a_RegionX, int a_RegionZ) override;
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// New introduced overridable functions:
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/** Called when a file is about to be saved, to generate the filename */
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virtual AString GetFileName(int a_RegionX, int a_RegionZ);
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/** Called before the file is saved */
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virtual void OnBeforeImageSaved(int a_RegionX, int a_RegionZ, const AString & a_FileName) {}
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/** Called after the image is saved to a file */
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virtual void OnAfterImageSaved(int a_RegionX, int a_RegionZ, const AString & a_FileName) {}
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/** Called when a new region is beginning, to erase the image data */
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virtual void OnEraseImage(void);
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// Functions for manipulating the image:
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/** Erases the entire image with the specified color */
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void EraseImage(int a_Color);
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/** Erases the specified chunk's portion of the image with the specified color. Note that chunk coords are relative to the current region */
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void EraseChunk(int a_Color, int a_RelChunkX, int a_RelChunkZ);
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/** Returns the current region X coord */
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int GetCurrentRegionX(void) const { return m_CurrentRegionX; }
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/** Returns the current region Z coord */
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int GetCurrentRegionZ(void) const { return m_CurrentRegionZ; }
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/** Sets the pixel at the specified UV coords to the specified color */
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void SetPixel(int a_RelU, int a_RelV, int a_Color);
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/** Returns the color of the pixel at the specified UV coords; -1 if outside */
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int GetPixel(int a_RelU, int a_RelV);
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/** Sets a row of pixels. a_Pixels is expected to be a_CountU pixels wide. a_RelUStart + a_CountU is assumed less than image width */
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void SetPixelURow(int a_RelUStart, int a_RelV, int a_CountU, int * a_Pixels);
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/** "Shades" the given color based on the shade amount given
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Shade amount 0 .. 63 shades the color from black to a_Color.
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Shade amount 64 .. 127 shades the color from a_Color to white.
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All other shade amounts have undefined results.
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*/
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static int ShadeColor(int a_Color, int a_Shade);
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/** Mixes the two colors in the specified ratio; a_Ratio is between 0 and 256, 0 returning a_Src */
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static int MixColor(int a_Src, int a_Dest, int a_Ratio);
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protected:
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/** Prefix for the filenames, when generated by the default GetFileName() function */
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AString m_FileNamePrefix;
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/** Coords of the currently processed region */
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int m_CurrentRegionX, m_CurrentRegionZ;
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/** Raw image data; 1 MiB worth of data, therefore unsuitable for stack allocation. [u + IMAGE_WIDTH * v] */
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int * m_ImageData;
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void SaveImage(const AString & a_FileName);
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} ;
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