1 /*
2 Copyright (C) 2003 Rice1964
3 
4 This program is free software; you can redistribute it and/or
5 modify it under the terms of the GNU General Public License
6 as published by the Free Software Foundation; either version 2
7 of the License, or (at your option) any later version.
8 
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 GNU General Public License for more details.
13 
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
17 
18 */
19 
20 
21 #ifndef __SURFACEHANDLER_H__
22 #define __SURFACEHANDLER_H__
23 
24 #include "typedefs.h"
25 
26 /////////////// Define a struct to use as
27 ///////////////  storage for all the surfaces
28 ///////////////  created so far.
29 class CTexture;
30 
31 typedef struct
32 {
33     unsigned short int  dwWidth;            // Describes the width of the real texture area. Use lPitch to move between successive lines
34     unsigned short int  dwHeight;           // Describes the height of the real texture area
35     unsigned short int  dwCreatedWidth;     // Describes the width of the created texture area. Use lPitch to move between successive lines
36     unsigned short int  dwCreatedHeight;    // Describes the height of the created texture area
37     int        lPitch;             // Specifies the number of bytes on each row (not necessarily bitdepth*width/8)
38     void        *lpSurface;         // Pointer to the top left pixel of the image
39 } DrawInfo;
40 
41 
42 enum TextureFmt
43 {
44     TEXTURE_FMT_A8R8G8B8,
45     TEXTURE_FMT_A4R4G4B4,
46     TEXTURE_FMT_UNKNOWN,
47 };
48 
49 enum TextureUsage
50 {
51     AS_NORMAL,
52     AS_RENDER_TARGET,
53     AS_BACK_BUFFER_SAVE,
54 };
55 
56 class CTexture
57 {
58 public:
59     virtual ~CTexture();
60 
61     uint32_t      m_dwWidth;    // The requested Texture width.
62     uint32_t      m_dwHeight;   // The requested Texture height.
63 
64     unsigned int m_dwCreatedTextureWidth;    // What was actually created
65     unsigned int m_dwCreatedTextureHeight;
66 
67     float       m_fXScale;      // = m_dwCorrectedWidth/m_dwWidth
68     float       m_fYScale;      // = m_dwCorrectedHeight/m_dwWidth
69 
70     bool        m_bScaledS;
71     bool        m_bScaledT;
72 
73     bool        m_bClampedS;
74     bool        m_bClampedT;
75 
76     bool        m_bIsEnhancedTexture;
77 
78     TextureUsage    m_Usage;
79 
80     virtual void ScaleImageToSurface(bool scaleS, bool scaleT);
81     virtual void ClampImageToSurfaceS();
82     virtual void ClampImageToSurfaceT();
83 
GetTexture()84     virtual LPRICETEXTURE GetTexture() { return m_pTexture; }
85 
86     uint32_t          GetPixelSize();
87     TextureFmt      GetSurfaceFormat(void); // Surface pixel format...
SetOthersVariables(void)88     inline void     SetOthersVariables(void)
89     {
90         m_bClampedS = m_bScaledS = (m_dwWidth == m_dwCreatedTextureWidth);
91         m_bClampedT = m_bScaledT = (m_dwHeight == m_dwCreatedTextureHeight);
92     }
93 
94     // Provides access to "surface"
95     virtual bool StartUpdate(DrawInfo *di)=0;
96     virtual void EndUpdate(DrawInfo *di)=0;
97 
98     virtual void RestoreAlphaChannel(void); // Restore Alpha channel from RGB channel
99 
100 protected:
101     CTexture(uint32_t dwWidth, uint32_t dwHeight, TextureUsage usage);
102     LPRICETEXTURE   m_pTexture;
103     TextureFmt      m_dwTextureFmt;
104 };
105 
106 #endif
107 
108