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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; ^$ Z" h$ p: P: {( n) y+ e3 n" @, t0 d2 o

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9 B, B4 D  W3 x  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。
& Q1 |3 j% W& }% G( t0 q
- G9 u- y( t% \% @* l7 N! X( m  HRESULT LoadPSD( LPSTR strFilename ) // 读取PSD文件
% f1 b: G0 \( l) E; [# U( R" a1 d  I" v  {
  d' `" D9 y. _. Z. F" R" E    DWORD dwWidth, dwHeight; // 宽高
3 y- _* t8 U) e) A    long lSurfWidth = m_Rect.right - m_Rect.left;
: B( @( K1 A. h    long lSurfHeight = m_Rect.bottom - m_Rect.top;
( m2 K7 E9 P3 P1 `    WORD CompressionType; // 压缩类型
- e( C$ ~3 l0 ^- m/ N2 n3 ?2 P    HDC hDC;( z3 P' o/ N  i( x/ G8 \% `3 c7 k
    FILE *fpPSD;' x5 q0 ^; ~1 s  i
    WORD ChannelCount; // 通道数9 R9 \/ i  k; S3 e* }& L; m% o; U$ t

+ B5 F7 E& e/ Y" l- Y3 ?8 t" s; ]    // 打开PSD文件/ V9 A0 i+ O8 T( L1 \( h
    if ( ( fpPSD = fopen ( strFilename, "rb" ) ) == NULL ) {
& c  n& R5 a  E/ {) p' t1 W      return E_FAIL;
& J; ]: m3 w$ {( F% h1 _# R+ r    }) L# a' z3 S5 U+ V7 J, X

4 l! Z- Y: Q$ P; n: `; y5 x4 ^    // 头四个字节为"8BPS"' E( e, \7 O$ N
    char signature[5];6 Y# N& B# G, ~+ N2 O- f
    signature[0] = fgetc( fpPSD );( {1 i. c# h! g* s3 q# ?/ A
    signature[1] = fgetc( fpPSD );- J) z) f/ q4 F1 G5 \0 @& p
    signature[2] = fgetc( fpPSD );  u5 k* B  T* m! d- R
    signature[3] = fgetc( fpPSD );
0 _5 g$ W7 d0 k% V* O6 b# Y    signature[4] = '\0';
5 o  {9 p9 `' o  e- }+ L    if ( strcmp( signature,"8BPS" ) != 0 ) {
. H3 E* Q4 y; U& N) ]' {      return E_FAIL;
+ L- f: @! Q& _6 x/ k9 S( s    }
" B& F) P2 P* i0 T+ a9 T4 V9 T& T% F9 a2 {8 e  [9 `$ F; _
    // 版本必须为1
& ]( D& j! b1 T5 g5 K    if ( Read16( fpPSD ) != 1 ) {
; t, K3 Y6 T$ Z% u      return E_FAIL;6 B( R+ t% F; K; L
    }
+ V0 d# O2 o. t& I- g  e  Y
& s+ N# `$ n5 o& S    // 跳过一些数据 (总是0)
7 X5 c, H& i" Q1 N1 z    Read32( fpPSD );
" t* w5 ^. k' J2 f$ ?* d; {    Read16( fpPSD );
: P0 E3 P2 U: E: e5 {
' o  b7 Y' p& o* i    // 读取通道数
2 f1 y, f9 j. B# Q: k9 y    ChannelCount = Read16( fpPSD );9 D  Y4 L$ X% e

+ c" N3 m) P6 g2 Q  L    // 确定至少有一个通道! `  q& |- `0 T; @
    if ( ( ChannelCount < 0 ) || ( ChannelCount > MAX_PSD_CHANNELS ) ) {, _- b0 _! \6 \( q. `  B: A" {0 H
      return E_FAIL;; j' V3 R, D. F' A, V
    }  Q3 c" H+ [& y% y$ g2 v" [" Y1 Q3 R; X

5 `2 y( M% V9 O    // 读入宽和高( j. V1 e6 Q0 ^7 D' Q- ^; M
    dwHeight = Read32( fpPSD );8 g; ~6 }* J( {
    dwWidth = Read32( fpPSD );# V) v+ V+ A6 p8 e! H  x
    if ( dwWidth != ( DWORD )lSurfWidth || dwHeight != ( DWORD )lSurfHeight ) {# s$ c! O. M( k4 k2 l8 ?- H
      return E_FAIL;
  A4 D9 E+ ?( a6 M+ V6 P    }# J5 t* D& C  |& s: d% G" d6 `
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    // 只读入8位通道' L. R# e% y( h* t
    if ( Read16( fpPSD ) != 8 ) {
, }5 ~% Z6 h/ w' S! f      return E_FAIL;- l2 ~. R" Z$ H& k1 E
    }
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# M# u9 N5 u1 v$ i1 X6 l    // 确定模式为RGB.
( R6 R" |/ E( p    // 可能值:
- A# ]9 b2 W( E6 Q9 D% W  g- ]    // 0: 位图9 X* {4 B$ x% b" G, c; V& E( t3 P
    // 1: 灰阶
7 z, d* ~  L( {- g: _    // 2: 索引
! b% \) f, W# H, {7 }8 P" ~% Y6 |( A    // 3: RGB; a- v. q4 ?3 o. Z
    // 4: CMYK
: V' O3 r2 C2 O* C    // 7: Multichannel
9 W4 J& k3 w# H9 U4 ?    // 8: Duotone4 c* p5 O5 t" ~9 |
    // 9: Lab+ V: b( p. H* K& N
    if ( Read16( fpPSD ) != 3 ) {" \* K; m, l8 E+ \
      return E_FAIL;
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    // 跳过数据(如调色板)
* F- D# S8 z8 J  l* `  D8 `    int ModeDataCount = Read32( fpPSD );* L4 E" R9 R: Q" M8 {! a
    if ( ModeDataCount )
! |+ L# L0 K2 V( o$ Y/ i3 w      fseek( fpPSD, ModeDataCount, SEEK_CUR );
* w. ]# S: y: G) n6 W# ^' ^% H) l, H1 `* x/ l1 N7 R! Q  y
    // 跳过数据(如:pen tool paths, etc)- Q" t+ J! k, J5 e9 [4 ^2 R
    int ResourceDataCount = Read32( fpPSD );/ ]* }4 `& u, s& y5 a
    if ( ResourceDataCount )# H5 Z" y9 n% r/ z% t  U# |
      fseek( fpPSD, ResourceDataCount, SEEK_CUR );/ i% D. e' S6 S1 |/ W

! O" ]! ]1 L" h1 g+ Y/ P    // 条过保留数据, B' o2 S; ]; F" @" B
    int ReservedDataCount = Read32( fpPSD );5 B$ R( m& l+ }$ v1 H2 L. Z
    if ( ReservedDataCount )% Q1 M8 K' U6 U( r
      fseek( fpPSD, ReservedDataCount, SEEK_CUR );
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( O( L! o  d: D. T& t    // 0: 非压缩* d. w, B2 ?# D- V; |
    // 1: RLE压缩
# T) t- t+ i% y# m    CompressionType = Read16( fpPSD );4 K0 S0 }: j0 Z4 I; q, l
    if ( CompressionType > 1 ) {
3 ]5 b/ u4 n0 [) @$ X, ?      return E_FAIL;
' c# U2 _7 c' e# O7 x    }! _4 m4 m$ y' B2 ]
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    BYTE* PSDPixels = new BYTE[ ( lSurfWidth * lSurfHeight ) * 4 ];2 [* x4 T- g( s3 n
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    // 解包数据
' \( q1 r% n0 G9 g: ~% `    UnPackPSD( fpPSD, lSurfWidth, lSurfHeight, PSDPixels, ChannelCount, CompressionType );
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" ?5 @% {9 ~1 l# \# @) {    fclose( fpPSD );- ^3 o4 u5 b& L6 y( t- ?

/ {8 L5 w8 w3 D    // 复制信息1 {0 z: y5 `$ X% n4 e
    BITMAPINFO BitmapInfo;6 h% Z$ z( b5 a/ f9 w$ E. P0 a4 Q& r
    ZeroMemory( &BitmapInfo, sizeof( BitmapInfo ) );
& C4 T& K  T5 F' e: [    BitmapInfo.bmiHeader.biSize = sizeof( BitmapInfo.bmiHeader );# j! h3 M9 J9 ]- Y0 b# p
    BitmapInfo.bmiHeader.biWidth = lSurfWidth;
6 U+ {1 ~' @  ^- E6 ^, _# p    BitmapInfo.bmiHeader.biHeight = -lSurfHeight;' b4 g( r# n# ?; ]: E
    BitmapInfo.bmiHeader.biPlanes = 1;8 i. ?+ r2 I& K, @
    BitmapInfo.bmiHeader.biBitCount = 32;8 i* R$ ?' N( ~- _1 A( i( E
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    m_lpDDS7->GetDC( &hDC );
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6 o; ~) O" Z$ n7 V/ H  p    int rc = StretchDIBits( hDC,
6 r- y( i; h* C7 G( Z( l                0,
$ k: w! i) N! W- O                0,! C, O# e' s! ]" y8 y
                lSurfWidth,
# \( X( h1 W& J. {, C6 X' X9 Z                lSurfHeight,
0 k# I0 r6 f* O* K: }                0,! Q8 U. a( ^1 J
                0,% q* P6 S# e& `" D4 I: z9 J
                lSurfWidth,
  D- n2 P8 F5 O, d                lSurfHeight,( C* ~( m0 X) C. V
                PSDPixels,
) B' ~) Q% B; S1 ~/ m                &BitmapInfo,: I+ U, u& n/ _# E4 G( q
                DIB_RGB_COLORS,
- i8 L0 V5 r% l. `, E' l: C0 l                SRCCOPY );
# N( G8 N5 E% y0 N: @( I0 }
% `& V% w. H2 U6 Z, X& ]4 b    m_lpDDS7->ReleaseDC( hDC );
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* D; e9 z" u7 Q    if ( rc == GDI_ERROR ) {
+ K- q1 u7 `1 O: O+ e% x% ^$ F6 [0 N      H_ARRAY_DELETE( PSDPixels );
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- l- z  d. f6 A6 [9 X6 W3 [* b4 ]& t  #ifdef _DEBUG
: n8 q4 _  G1 t    g_pHERR->OutDebugMsg( 3, H2DSERR_INVALID_PSD );) F- i% p' G% p2 M
  #endif
! z6 k0 o# f* _( |    return E_FAIL;
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    }7 o: w: U/ s2 w. e+ s2 F

; i/ |! R; e! e    // 是否读取Alpha混合通道% Q+ M8 T" q7 C5 m: J& q9 ?! T
    if( ChannelCount > 3 ) {
7 K  g( X% m( A4 G3 U      m_pbAlphaMask = new BYTE[ lSurfWidth * lSurfHeight ];
" Q( E  _1 e# a4 x' e" Q( Q
( d* _6 z: H  j; A" Q2 B/ e    for ( int x = 0; x < lSurfWidth; x++ ); x2 T+ \" ^1 T5 N
      for ( int y = 0; y < lSurfHeight; y++ ) {
, H1 ~* s* {; s7 z: J2 r9 \. p7 I        m_pbAlphaMask[ ( y * lSurfWidth ) + x ] =
! F, m! ~5 P/ h                PSDPixels[ ( ( ( y * lSurfHeight ) + x ) * 4 ) + 3 ];  y3 v- \% T9 A4 L/ I9 ?+ ~8 ~$ z! x
      }
& M4 A- m7 {# v% s# Z    }/ Z) v7 d% A: Q& G0 O. ]+ b7 B
    else {
9 @: i% U% L, o5 \      m_pbAlphaMask = NULL;) W$ j3 ^. V; F2 r3 k, k
    }
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    H_ARRAY_DELETE( PSDPixels );
; r3 @+ p8 {0 F- F8 o, X' |. U+ P6 {
    return DD_OK;
1 i) ?/ E9 w6 f9 v  }
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  // PSD文件解包/ ]0 o# R* h2 P. |* Q, O
 * D; p; e4 Z, {8 _; b4 ]
  void CHades2DSurface::UnPackPSD( FILE *fp,     // fp为PSD文件指针,
" w0 D) g7 D. d7 ^) b: T) e+ f                   DWORD dwWidth,   // dwWidth、dwHeight为宽高,% K. P' @' u) h/ g7 T1 n
                   DWORD dwHeight,; X  V6 ]. o% s# n- I) j
                   BYTE* pixels,   // pixels为解包目标指针,4 ~1 s* M; t4 u" `  U2 W
                   WORD ChannelCnt,  // ChannelCnt为通道数,
6 s4 Q0 T* U7 {, F                   WORD Compression ) // Compression位压缩类型。
& r- U- x( W8 A: D. K                
2 h( O7 S: r# Q                 8 r1 Q/ P6 |6 h% Q2 l2 J
  {
. F$ W. Y; X' A4 {; T5 \( I1 Y. L    int Default[4] = { 0, 0, 0, 255 };
' D( O" _( j. W! X+ l* A+ X( r    int chn[4] = { 2, 1, 0, 3};
6 ~+ N4 i, z" v. M7 \2 Y    int PixelCount = dwWidth * dwHeight;$ H- j/ V( U. [: @& [$ ~
0 z- ~/ B! S; k4 P- n9 ]
    if ( Compression ) {
& Y6 ]' O& e9 d6 V  |      fseek( fp, dwHeight * ChannelCnt * 2, SEEK_CUR );
1 D; m6 U% v" N  h1 s
! B& F( n8 t' D7 s) _6 k      for ( int c = 0; c < 4; c++ ) {
7 ?5 ?! n; G+ @0 j: @2 j        int pn = 0;
% |7 V; `$ U" ~  c! @% B        int channel = chn[c];7 w$ W  A. q9 {7 R3 z
. ^& w- u% {6 \2 J+ j; n
        if ( channel >= ChannelCnt ) {
; C2 v* c+ I1 T% e          for ( pn=0; pn < PixelCount ;pn++ ) {
9 V# G. C5 R" s  I            pixels[ ( pn * 4 ) + channel ] = Default[ channel ];
7 l% b- R' j0 N' F5 n$ W          }
) H# Y5 v* d/ O. W3 s2 E        }
0 c8 M3 h, b& f- A* X' T        else // 非压缩
$ n' ]# k6 e* v; R, R* H8 Z        {
6 L; ^" K( i* J6 N          int count = 0;
0 h2 X: h# A& a  f: I3 ?          while( count < PixelCount ) {
8 h3 y: t2 A8 V' ]" W' n& {. s            int len = fgetc( fp );( a7 C/ z) n9 D$ [4 ?& G5 D
            if( len == 128 ) { }
$ m- g& @/ z( _: W4 d* A& l            else if ( len < 128 ) // 非RLE/ H" _4 `. W* q  i5 t0 n$ I
            {/ G4 F" j7 T1 v# ]& ^0 }$ a# V
              len++;
& h6 _: b7 ~/ q% _              count += len;; h7 A1 k: R2 X" L  n
              while(len) {
/ ^0 C! @. l% Z3 p                pixels[ ( pn * 4 ) + channel ] = fgetc( fp );
0 m6 N; j3 W$ o, ?1 F                pn++;$ b  H8 s* W. k
                len--;
0 h+ _4 @! s- B# t1 d# O              }
! l" r/ y1 Z1 }# a8 x            }8 E- U$ v4 c8 r2 b
             else if ( len > 128 ) // RLE打包( h4 D; G7 ~9 w% B" r" M
            {5 E, ~, Q& M! m; K( n* F
              len ^= 0x0FF;* ?- }1 K4 c4 k/ P
              len += 2;
: r( r4 n3 k' }7 M+ j              unsigned char val = fgetc( fp );/ }8 x! E! v% s0 G$ H
              count += len;* t8 A1 X  g) c# E  [3 m+ Y
              while( len ) {; G/ R% ]# n  ]9 y
                pixels[ ( pn * 4 ) + channel ] = val;$ P" s; r) c1 p; X
                pn++;
5 [% e6 k/ h5 [7 o                len--;
! U' M. F/ \3 J0 n              }
- M/ @9 g6 I& ^# F3 N            }" K) _  ~2 F, W0 e: }: X9 q
          }9 L# V! x3 Q. P2 I: i
        }/ a( I1 I2 b/ S2 ?& |
      }% H1 E9 L6 w6 |7 ^4 ], v5 D
    }  T. H3 ?4 a2 I2 ^/ g3 B
    else: C6 C) P2 G8 V) f4 P, `
    {& Q; o- l4 L" q' a5 o0 {: b
      for ( int c=0; c < 4; c++ ) {- K) _3 E0 o3 r9 S1 `
        int channel = chn[c];
* R8 o/ w" E0 ~: T4 B/ A' `: [% _        if ( channel > ChannelCnt ) {
, Z2 K! i8 ]. Z( z8 F4 m8 M          for( int pn = 0; pn < PixelCount; pn++ ) {5 f. f5 @9 w( O. `8 x$ l
            pixels[ ( pn * 4 ) + channel ] = Default[ channel ];9 s3 E( ]3 Y/ @4 s1 V! ?
          }- `& j% d  P/ k; f
        }5 J' S8 }" S# B
        else {
6 K) P0 |( k4 s4 J( h5 T& m          for( int n = 0; n < PixelCount; n++ ) {: x* z! A2 a! ]' m% g
            pixels[ ( n * 4 ) + channel ] = fgetc( fp );* D: g  w, h, r0 i
          }
5 Q  O+ k3 Y! g0 I0 ~        }
( e/ m3 u8 T" \7 X1 ^. e4 g9 a# w      }8 }, _/ _7 H/ Q) @+ M; w1 f4 d: F3 l
    }
$ B; U- E1 r  q% D( n  }
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