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[收藏]PSD格式文件的读取

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发表于 2004-3-8 23:32:59 | 显示全部楼层 |阅读模式
PSD格式文件的读取6 ~# a6 t: Y0 I  u
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  PhotoShop,我想没有人会不知道吧。如今最新的版本是6.0,其图象文件*.PSD和5.5相比变化并不太大。以下我就介绍*.PSD文件的读取方法,并提供完整读取函数。其中:m_Rect为目标区域,m_lpDDS7为目标DirectDraw表面,m_pbAlphaMask为目标Aplha通告指针。Read16函数为从指定文件当前位置读取一个WORD,Read32函数为从指定文件当前位置读取一个DWORD。MAX_PSD_CHANNELS为24。以下就是*.PSD文件的读取方法,有兴趣的朋友可以继续深入研究,到时可别忘了发我一份。& i: I" H) K, w8 R/ z

: _6 z3 m  f% \# z* k' |, g  HRESULT LoadPSD( LPSTR strFilename ) // 读取PSD文件
. t( {8 X$ b' d6 {  {
0 U8 K" j9 U9 E: T& D# b* U. A    DWORD dwWidth, dwHeight; // 宽高
" Z7 l2 F: G) V( a3 X    long lSurfWidth = m_Rect.right - m_Rect.left;
3 i7 p; o5 a: T* H2 i- x* p/ Q    long lSurfHeight = m_Rect.bottom - m_Rect.top;
2 `; V; _  T+ A) ], f% I: E    WORD CompressionType; // 压缩类型
4 r0 T! T9 s. C. y    HDC hDC;
# B& l8 p- F( L& o- Q, g% B    FILE *fpPSD;
& o& q/ f" W; s' p: y! D5 N3 T/ h    WORD ChannelCount; // 通道数
' `6 V4 ]! R9 _; q, e' g& Y/ t9 W0 {( D+ g; a% b
    // 打开PSD文件, a- W1 a. K/ l% d* I6 w& n* `
    if ( ( fpPSD = fopen ( strFilename, "rb" ) ) == NULL ) {
5 f8 H1 {* l9 ^9 t4 w      return E_FAIL;" ?, p7 X! Y/ `8 v. k* Y1 E) D+ p
    }( H. d; D( E% Z% P/ x0 a
" U% k4 ~$ m% d, m2 k2 k
    // 头四个字节为"8BPS"  {' i8 e" m; R9 b$ x+ l/ H
    char signature[5];
6 Q1 m$ x3 Q, ^: U# ], }    signature[0] = fgetc( fpPSD );
# m' z0 r! s% t    signature[1] = fgetc( fpPSD );! K) W8 N7 E  m3 K5 f5 g
    signature[2] = fgetc( fpPSD );0 g, ^8 `* e  q1 Y
    signature[3] = fgetc( fpPSD );
- c* f/ d4 R* O$ U5 {! X    signature[4] = '\0';
; r0 |3 b/ y3 j- X3 d    if ( strcmp( signature,"8BPS" ) != 0 ) {$ R- \8 g+ H" l8 n
      return E_FAIL;
- `" ]: [2 I4 y    }
6 q- k- V+ O8 w' G7 k
1 Y  ~$ x  B3 W" J  N7 B    // 版本必须为10 J( k  R! ?: s/ Y3 c2 l3 m; G
    if ( Read16( fpPSD ) != 1 ) {
( \2 b+ i5 `6 c8 Q/ C% g% l      return E_FAIL;/ ~" _% v0 [, ~9 k
    }
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    // 跳过一些数据 (总是0)
! ^* @: t* X" n- w    Read32( fpPSD );
; e8 ~1 B: Y/ f: U6 a    Read16( fpPSD );2 x8 @& m$ T! Y. y4 T$ I
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    // 读取通道数5 d7 I' j$ Z( \1 M2 `
    ChannelCount = Read16( fpPSD );$ F) V, k; k6 a3 q2 K* f
2 Q" l5 b6 o% T7 F# u( x
    // 确定至少有一个通道
1 [5 Y, W0 k* I; q4 t2 E2 {7 z* N; e    if ( ( ChannelCount < 0 ) || ( ChannelCount > MAX_PSD_CHANNELS ) ) {
+ K2 ?  ]$ x( F      return E_FAIL;
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, {8 n7 P7 h: _% W" }& [0 p3 w    // 读入宽和高
8 ~0 b! S6 x: v8 x: d( ?    dwHeight = Read32( fpPSD );! |% ?& h6 t$ Z0 {9 R# f% |
    dwWidth = Read32( fpPSD );- F' ]6 {9 X$ h
    if ( dwWidth != ( DWORD )lSurfWidth || dwHeight != ( DWORD )lSurfHeight ) {! K' E8 Q9 y# l( o! P8 x: u. V
      return E_FAIL;
2 H1 X  l1 F. F3 K3 C    }& t" S6 N; W/ n7 ]% T' V
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    // 只读入8位通道; q9 g& T5 x8 L4 D+ w1 I/ W, y9 s
    if ( Read16( fpPSD ) != 8 ) {
9 K! `" i! H7 x% {$ l6 {( y+ G) l. B      return E_FAIL;  }" [9 C7 H" z! G' g3 b$ j
    }
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    // 确定模式为RGB.4 A, C8 y4 {9 P$ S; x! J8 \
    // 可能值:! I! m3 N) k. L. f. q% \" v
    // 0: 位图2 o% E! z" b5 N9 p
    // 1: 灰阶/ H7 m, n; b$ P# ?
    // 2: 索引* Y' C  U* p# d' m
    // 3: RGB
) T! F4 V, k# V6 G' o    // 4: CMYK7 l9 w! \$ D$ \) `( Z
    // 7: Multichannel
- b/ ]& ^% O) d2 ^# |    // 8: Duotone
1 F, G# j3 _& X1 Z0 @    // 9: Lab1 m! y% f/ A$ r
    if ( Read16( fpPSD ) != 3 ) {
' f0 R  c' m$ N% l* q) p" J      return E_FAIL;& t' ^+ U8 i: |  U1 ?2 R7 Y
    }3 A, s; s* v- k( L8 l5 _4 |( ~
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    // 跳过数据(如调色板)5 V3 x' h# y  t: W0 v; [! t5 e* n0 m
    int ModeDataCount = Read32( fpPSD );
8 D' h/ M& W* U" Q9 ]* [" C    if ( ModeDataCount )
' R1 G) {; ?3 g$ a; n      fseek( fpPSD, ModeDataCount, SEEK_CUR );
; m! d* B* p; s$ {& }  {/ [
4 g/ Q) @% ~& s8 R& `$ x: Y4 X* n    // 跳过数据(如:pen tool paths, etc)% z) z# c# `0 l$ x
    int ResourceDataCount = Read32( fpPSD );. l. v$ x  t" `, N
    if ( ResourceDataCount ). @" p( c, M( N" n
      fseek( fpPSD, ResourceDataCount, SEEK_CUR );: p* |# f: W5 |" ^# H* J' @, D
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    // 条过保留数据/ f1 W; }; B9 `+ Z1 |" ?
    int ReservedDataCount = Read32( fpPSD );+ n6 P5 F. w+ I' y) t
    if ( ReservedDataCount )7 S* Q! ^% c5 l
      fseek( fpPSD, ReservedDataCount, SEEK_CUR );/ e0 S( F& h3 O, N- p7 B) ?
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    // 0: 非压缩
* B! u% |# H. j* [8 T% O: g    // 1: RLE压缩
" _' ^" B, }9 W4 r: m    CompressionType = Read16( fpPSD );
$ j5 m- [& b3 m' f    if ( CompressionType > 1 ) {
* Z8 Q+ o8 X# P& B/ x8 Y  S6 E      return E_FAIL;! {0 z8 B. q( R
    }
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    BYTE* PSDPixels = new BYTE[ ( lSurfWidth * lSurfHeight ) * 4 ];% ^% u4 `6 F( u) a' e0 s4 x/ K+ R% F

! {5 A: S3 S" l/ x" m    // 解包数据
5 e5 ?  ]' ]; b. b* C. Z" D    UnPackPSD( fpPSD, lSurfWidth, lSurfHeight, PSDPixels, ChannelCount, CompressionType );
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    fclose( fpPSD );
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    // 复制信息
+ L2 s; y( Q* M; u8 {/ ]    BITMAPINFO BitmapInfo;
- S6 _; e) s/ G: |1 w3 t0 ^    ZeroMemory( &BitmapInfo, sizeof( BitmapInfo ) );
1 e6 `8 O- z# P" @    BitmapInfo.bmiHeader.biSize = sizeof( BitmapInfo.bmiHeader );
" u7 s* S7 J/ c4 }, w6 |3 X# h7 C    BitmapInfo.bmiHeader.biWidth = lSurfWidth;
# n- \9 D% S, s6 N: G    BitmapInfo.bmiHeader.biHeight = -lSurfHeight;3 G, o3 F% M/ n2 _4 [$ V8 n
    BitmapInfo.bmiHeader.biPlanes = 1;
  y! K  o. ^% H( I/ j/ X    BitmapInfo.bmiHeader.biBitCount = 32;5 P6 m8 N0 g  C5 Y; M

+ _8 U! J# E% T6 Q    m_lpDDS7->GetDC( &hDC );
5 g5 q( j3 R' M' t/ P' Y2 c' E# D4 Q% W' [0 S
    int rc = StretchDIBits( hDC,  N, ]6 I: q+ S) U0 r1 n* Q; |
                0,
5 Q9 C+ p/ P% V0 a6 ^: F: F2 B" Y                0,5 }! X2 H! A! p( A3 w/ ^
                lSurfWidth,
5 M5 K0 c2 L3 E2 T: m" g( ]$ S                lSurfHeight,. i* p: ^* j/ j7 V
                0,
2 B2 L; ]' y7 W) u7 L( Q                0,
% K9 A( b) [+ Z$ x6 L5 u                lSurfWidth,
/ h4 h8 y/ V2 U                lSurfHeight,
$ L% G8 B7 A4 A* q8 a0 F                PSDPixels,
( X6 |* E2 z4 [# ]) r" r: P; K" g/ ~                &BitmapInfo,
' }* ^, N: F7 a: I                DIB_RGB_COLORS,+ d5 E% }0 o1 i0 z  ?  k" U  t
                SRCCOPY );
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3 n  M. @) ^4 T( a    m_lpDDS7->ReleaseDC( hDC );& b. @2 e+ t$ O; V3 \$ E) `% B

9 H6 a7 M% [2 u0 O; z    if ( rc == GDI_ERROR ) {
: c  t% R+ n% `* b5 {8 Y      H_ARRAY_DELETE( PSDPixels );+ a- x2 E  a! Z9 G* x  _; X

  I0 q. j0 W- P3 r! P* T  #ifdef _DEBUG
2 a  W* Q5 O. |! h: J4 w    g_pHERR->OutDebugMsg( 3, H2DSERR_INVALID_PSD );
; d& N# T# r# u9 ^1 l  #endif
, O1 A, V/ B! D8 R( W% b, V    return E_FAIL;! ^/ k' B7 E2 ?% c+ v

" h7 w9 }% v/ @8 s( v' A    }
* `1 O9 A% N3 }& Z
, v. o* x8 ]3 O6 }5 q! \    // 是否读取Alpha混合通道
$ R8 }- l3 u: y" Y    if( ChannelCount > 3 ) {: z7 q0 l5 m, y( f+ J( A! i' `
      m_pbAlphaMask = new BYTE[ lSurfWidth * lSurfHeight ];% F8 `1 _' h( Q
& ^0 K' ]5 y: v6 d
    for ( int x = 0; x < lSurfWidth; x++ )
2 d6 C9 L4 T9 g7 f4 y      for ( int y = 0; y < lSurfHeight; y++ ) {$ f. k, N) @. A8 `& {
        m_pbAlphaMask[ ( y * lSurfWidth ) + x ] =
" z! q+ q2 p$ f                PSDPixels[ ( ( ( y * lSurfHeight ) + x ) * 4 ) + 3 ];
* q% N- c0 F* h: F8 c- S9 v      }, k  U0 m% b- }+ z# B
    }
4 f% g& H: l8 @0 c    else {5 O( G( Z) \/ P# [+ z
      m_pbAlphaMask = NULL;
) F5 b% g1 z) |" @/ Z7 E    }4 W5 U  ]/ `( N

' s' v2 ^+ K4 P3 H* ~4 q    H_ARRAY_DELETE( PSDPixels );
7 D3 F9 @) V* ?& k: z; X
7 n+ d( B& q9 ]# }" J' Z3 A    return DD_OK;2 W# U7 h8 p. z
  }2 k2 @# G! D$ G% z2 i6 o" G

) x' [: ?1 `+ y0 I* n. ?# ~  N  // PSD文件解包* x4 \& {8 \) R3 C
 
  A7 P) F1 x0 d* m& C4 r/ n  void CHades2DSurface::UnPackPSD( FILE *fp,     // fp为PSD文件指针,
* f. l+ N3 B% X# y# ~  O                   DWORD dwWidth,   // dwWidth、dwHeight为宽高,
6 O( z  K0 J: \: u$ @! D/ F                   DWORD dwHeight,* H% J: y6 w# }7 I; t1 I  K. j, ]
                   BYTE* pixels,   // pixels为解包目标指针,
4 l) Q7 P6 G( c" J. W$ P; n6 A                   WORD ChannelCnt,  // ChannelCnt为通道数,
2 f2 z8 d  \! B% |9 N                   WORD Compression ) // Compression位压缩类型。 2 L& A' z& H1 i9 D
                
8 k. v2 w3 ~/ `/ X                 / ^! x. o+ q, @
  {/ \+ v6 }# k5 q" t
    int Default[4] = { 0, 0, 0, 255 };
' t1 b, S2 D% l$ R2 Q/ A    int chn[4] = { 2, 1, 0, 3};
- g, f: H2 F7 u- X8 K    int PixelCount = dwWidth * dwHeight;
8 H& X3 a! ~1 @- S# H
+ f, I( c  Z  |5 {  j" g+ r8 F9 F, ~    if ( Compression ) {: L" |& R2 I, t: f
      fseek( fp, dwHeight * ChannelCnt * 2, SEEK_CUR );
" \8 w) _2 F4 c* a4 g6 l# i. W+ r  X- @
      for ( int c = 0; c < 4; c++ ) {" k. S0 p! v- K0 `, _- Z
        int pn = 0;* H, b2 D8 }  f1 V& \( m
        int channel = chn[c];. P- _' `$ k% C; G4 t

" O' ?: M& Q  }6 Y+ R5 k* t& U0 R8 j        if ( channel >= ChannelCnt ) {
4 S: ^( U) }  e8 H5 n9 u1 q( |          for ( pn=0; pn < PixelCount ;pn++ ) {
' n: K& I+ U, f" c8 V            pixels[ ( pn * 4 ) + channel ] = Default[ channel ];
2 N$ z& Q. y/ S7 }$ ]$ H6 B          }& h7 O$ H7 Y7 }: f( @
        }
: ~' `5 V* F1 I; A- X        else // 非压缩/ p% }# }8 q) @; [
        {+ j/ ~. Y' I5 k8 d
          int count = 0;
2 G) |( p+ [; W, \3 O. i8 _          while( count < PixelCount ) {" y& c- h6 [/ V. q
            int len = fgetc( fp );
/ |* d& W6 G. o            if( len == 128 ) { }8 `' M" t$ d. T! y, q5 u0 D
            else if ( len < 128 ) // 非RLE0 [6 _, L! V9 h+ E% K6 ~: e
            {" i* I$ P; [% y' X& B! v+ c: X4 G
              len++;% Y! L* `# o3 j
              count += len;
2 g8 ^3 G* W3 l9 M              while(len) {
0 |" g$ U8 ~( H4 x: L7 t' y                pixels[ ( pn * 4 ) + channel ] = fgetc( fp );
& u( ~6 y" X0 T                pn++;
9 G+ S, r/ ]1 ^" G" Z3 E                len--;, M% {$ k. d) o6 i9 t
              }4 Q+ G; O2 r3 J9 N
            }9 a+ G+ z) E0 g6 ^) f
             else if ( len > 128 ) // RLE打包3 y+ `. {9 p7 b" L
            {$ u" V1 Q' R7 M; n# w+ n
              len ^= 0x0FF;* C0 L" ~, k+ w
              len += 2;7 S' R8 C0 U# d3 \3 [
              unsigned char val = fgetc( fp );8 A2 ~4 a( A- ]# H
              count += len;6 p1 E9 e5 ~7 T' E: D
              while( len ) {8 v4 v/ t' `- M
                pixels[ ( pn * 4 ) + channel ] = val;
. J: S- ^. G( D" @& }4 E$ ?4 q: m  V                pn++;$ B4 A" _' D+ \6 _4 R
                len--;
% e* @. L1 B) a              }9 G) e6 W  V* x* D# b# h: X
            }% d8 H; [& A1 y, i
          }
7 `5 |7 G+ d* H: n8 w6 t% K5 z        }$ I& R8 u9 E8 D3 O. v# {
      }
! w4 [- m' i0 n. }" A    }
/ z7 h/ M7 B; c$ C0 u    else
) W7 S4 d- t* k- f3 _3 f7 `# F5 q    {
( A6 J* l, ?  M3 z; \4 Y" r2 P      for ( int c=0; c < 4; c++ ) {1 Z! S# C7 P) p! ~4 m
        int channel = chn[c];
' Y5 O1 }( k% P1 @. n        if ( channel > ChannelCnt ) {
/ o4 Z8 v) ?9 J& r' v- l& G+ `          for( int pn = 0; pn < PixelCount; pn++ ) {1 T0 w3 c  D' Y0 }
            pixels[ ( pn * 4 ) + channel ] = Default[ channel ];9 p& G" l8 \+ j' j# m/ |" a
          }* a8 @5 U0 ?7 K; S2 U2 Q2 j' W- D( `
        }
/ p; e( \5 v5 I4 b9 [        else {
+ n4 f; w# N6 X9 p          for( int n = 0; n < PixelCount; n++ ) {, }2 d" `: _& w
            pixels[ ( n * 4 ) + channel ] = fgetc( fp );
  [& S) d6 I# p0 ^          }
4 h& k8 Q% @* O9 j% B! H- Y        }' q! m. X3 N3 g1 ^
      }9 t3 c( [8 ^; U3 y$ j0 f/ c
    }4 o* a' Y: \# ^3 j3 }% n7 L1 U
  }
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