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PSD格式文件的读取) V# P9 f% S" a
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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。
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! y, g# b" Z. N7 w HRESULT LoadPSD( LPSTR strFilename ) // 读取PSD文件1 @, ]+ S3 ^ O( G1 \
{
3 A1 M0 V2 J! q+ V2 u9 S' |* ` DWORD dwWidth, dwHeight; // 宽高. a' S' C9 t% |9 w& p5 _
long lSurfWidth = m_Rect.right - m_Rect.left;
1 _4 ]" V4 b6 R- F9 V; v' Q long lSurfHeight = m_Rect.bottom - m_Rect.top;1 b5 P7 C/ ~: K ?( C% e
WORD CompressionType; // 压缩类型
+ h3 k3 ?; R; H8 u( f, i. L HDC hDC;. o8 {9 {4 \4 x. n: E
FILE *fpPSD;1 Q; ]& {( t" @
WORD ChannelCount; // 通道数% T# C1 u3 @/ Z7 p0 n
. w" {* h, }( I) } // 打开PSD文件
; m0 [1 c0 q6 g* e. u4 b) A if ( ( fpPSD = fopen ( strFilename, "rb" ) ) == NULL ) {. Z: q. ~ A& d1 L1 n
return E_FAIL;/ B- C/ ^. {0 Z
}; X. K5 \$ K6 j N
% k% R. `+ n8 D3 C // 头四个字节为"8BPS"
. O+ c/ ?4 P1 p1 H+ j7 c char signature[5];
) L$ a5 c6 Q( }4 d" K2 t signature[0] = fgetc( fpPSD );2 y i k/ w% O; n1 |6 j+ m
signature[1] = fgetc( fpPSD );
% g/ Y" M, k& V; T signature[2] = fgetc( fpPSD );
4 D2 O2 ?; U5 [. N3 U- l' B0 n signature[3] = fgetc( fpPSD );
) x9 s* R( f/ P8 s) a/ ` signature[4] = '\0';5 @+ o/ k/ c6 B! Y
if ( strcmp( signature,"8BPS" ) != 0 ) {: O; x ]2 M6 s) I
return E_FAIL;
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0 k. o- R L/ N# x8 E2 ^0 h7 w // 版本必须为1- B6 t: O' }' E; s$ K. G0 T
if ( Read16( fpPSD ) != 1 ) {7 N, U o0 Z5 o* y O8 K$ M
return E_FAIL;; R" J+ Y( W4 k0 F) p* v( x
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" i4 W! l: _. b4 ^% c9 H( C // 跳过一些数据 (总是0)7 ~0 [- X& S/ c% b" p3 @$ R
Read32( fpPSD );1 S; Y5 G: n$ c V4 O4 d
Read16( fpPSD );
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// 读取通道数
% S7 ]9 F& T6 M2 z4 M+ Z9 J ChannelCount = Read16( fpPSD );3 x* Q- F9 D0 o# O
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// 确定至少有一个通道
o& Z" y4 M5 ?* @2 k M) F if ( ( ChannelCount < 0 ) || ( ChannelCount > MAX_PSD_CHANNELS ) ) {# L- y. Z6 E0 a) L5 U- \ F
return E_FAIL;
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- h( O# m& L' x" `5 R3 A: F // 读入宽和高- ]: j! j3 o& }& B) ~
dwHeight = Read32( fpPSD );( }) T4 F5 H! H7 K. E
dwWidth = Read32( fpPSD );
' n- Y/ L9 Y& A9 _0 q if ( dwWidth != ( DWORD )lSurfWidth || dwHeight != ( DWORD )lSurfHeight ) {, y8 `& E7 i w) B, p& H: L: [
return E_FAIL;
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// 只读入8位通道
+ K- A# O1 P5 w, A if ( Read16( fpPSD ) != 8 ) {+ x) u' r% u+ f" A5 u
return E_FAIL;7 i* P. p1 @9 f) ~* p- z
}
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7 L- z" Q' b- u* Z" h& A/ X; ] // 确定模式为RGB. r, D; l9 z f; C) [5 L n
// 可能值:
' O9 T, i# s0 a // 0: 位图
' G/ c0 n/ e' c$ ~ // 1: 灰阶7 k7 X1 Q1 X/ z/ Q2 n
// 2: 索引
' j- X) W9 \9 p4 H. s s/ G // 3: RGB
0 M: e4 I! q0 I+ X* Q" e // 4: CMYK3 w: e. p9 y: |3 r7 l6 l8 I
// 7: Multichannel- L2 S7 G m9 C" d% \
// 8: Duotone8 O1 r9 E' g( t! y
// 9: Lab% x( [0 d) u; h) M, R
if ( Read16( fpPSD ) != 3 ) {
% W. D# P7 @* B. r' x% `# ~- s return E_FAIL;6 [# x6 ]1 i7 J5 e9 v/ p7 u L; l
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7 d& u- [; m0 P5 ?6 d8 h' J5 \ // 跳过数据(如调色板), r* I/ ]( i( ^( p: u- j
int ModeDataCount = Read32( fpPSD );5 ?2 q2 a1 _0 J" U8 o( {
if ( ModeDataCount )
; p+ {$ C9 T+ C. n% i( ? fseek( fpPSD, ModeDataCount, SEEK_CUR );9 u5 {; o$ a; b9 e. O
' Z* e: S, t4 r! d5 h' f // 跳过数据(如:pen tool paths, etc)
) ]6 j, @9 F5 J! S6 [ int ResourceDataCount = Read32( fpPSD );' ^, L4 L* T2 [0 t% C
if ( ResourceDataCount )
/ L+ i' F. n2 G5 g" r- F3 V fseek( fpPSD, ResourceDataCount, SEEK_CUR );
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// 条过保留数据
$ R2 I# d9 u; t! L* \9 r int ReservedDataCount = Read32( fpPSD );
' k$ U; {( i. j% h if ( ReservedDataCount )
' A3 @3 G8 D% Y, J' s) g5 O8 q7 { fseek( fpPSD, ReservedDataCount, SEEK_CUR );; H$ T8 ~ w# ^1 @5 `* D' n. q; h2 n, b
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// 0: 非压缩
4 L% `' Z2 N( s; t // 1: RLE压缩
- V A9 \" ?) [% @" w0 [ CompressionType = Read16( fpPSD );
: p5 @: k& ^9 ^! ?3 j" w if ( CompressionType > 1 ) {
. M; c3 H( m+ l: Q& v! a" o return E_FAIL;
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9 K0 G4 o+ m! m+ E" z3 z BYTE* PSDPixels = new BYTE[ ( lSurfWidth * lSurfHeight ) * 4 ];
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// 解包数据
4 A$ }0 m$ H8 I- Z& s UnPackPSD( fpPSD, lSurfWidth, lSurfHeight, PSDPixels, ChannelCount, CompressionType );6 _% b' } f. X8 _
; l+ E+ f7 h. o fclose( fpPSD );! I6 k7 ]' y# U2 p' h8 \0 S
* D9 Q. Y* N9 f% J" e // 复制信息! T f% H" j% P8 q
BITMAPINFO BitmapInfo;: \0 c% @1 I/ h2 F3 g7 e
ZeroMemory( &BitmapInfo, sizeof( BitmapInfo ) );( J1 [. V, M+ d% p/ E* c" z& P
BitmapInfo.bmiHeader.biSize = sizeof( BitmapInfo.bmiHeader );( z5 q7 E! w1 @
BitmapInfo.bmiHeader.biWidth = lSurfWidth;+ b: p* N8 J3 ]$ ^& w7 X$ y& E
BitmapInfo.bmiHeader.biHeight = -lSurfHeight;5 c, _6 S8 ?5 S: M! H
BitmapInfo.bmiHeader.biPlanes = 1; p& Y) x( S; O6 g1 f" k& \% ]
BitmapInfo.bmiHeader.biBitCount = 32;
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m_lpDDS7->GetDC( &hDC );. w7 _" c/ R. r7 {. ^% C
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int rc = StretchDIBits( hDC,5 ]) X3 L! I2 E- R" M0 {
0,
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& P- U. M( }5 A lSurfWidth," `0 g0 @5 H) Z+ ^5 ?
lSurfHeight,
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0,
' g- t; ]& F! I4 C8 s5 ^9 B lSurfWidth,' W/ y. c" w+ [' D6 O
lSurfHeight,. _+ T7 W% n6 ^4 C+ k* e) y
PSDPixels,
3 d) Z0 D" A3 ?& g4 X$ p; m &BitmapInfo,& `% R, G0 `+ s I- I
DIB_RGB_COLORS,; \! c2 q+ ^2 [5 @+ c$ t' G; j
SRCCOPY );
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m_lpDDS7->ReleaseDC( hDC );
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if ( rc == GDI_ERROR ) {9 h4 W) t2 y% B- `, u V
H_ARRAY_DELETE( PSDPixels );8 ]3 f: g- j2 |5 g
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#ifdef _DEBUG
2 q: p) p) ^$ U; O1 N g_pHERR->OutDebugMsg( 3, H2DSERR_INVALID_PSD );
- D6 q0 W$ Z* V% s- A' ] #endif
3 q, a. |3 v' X( A- W; h return E_FAIL;% h# C* y3 l+ X8 |9 S9 W
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// 是否读取Alpha混合通道: i" L' ^$ N8 ]3 P" t1 P# o
if( ChannelCount > 3 ) {1 y) P! Q/ u: H8 @$ E, W
m_pbAlphaMask = new BYTE[ lSurfWidth * lSurfHeight ];$ @9 n! d$ q3 D2 L( N9 @
, ^4 f) z6 n4 h0 A1 S$ s: g8 P for ( int x = 0; x < lSurfWidth; x++ ); h) [' m; m6 P' Y& ~7 z( `' E
for ( int y = 0; y < lSurfHeight; y++ ) {% J" G: G3 d, Y5 ?
m_pbAlphaMask[ ( y * lSurfWidth ) + x ] =
! q; W; F+ G" {3 k' [- O PSDPixels[ ( ( ( y * lSurfHeight ) + x ) * 4 ) + 3 ];
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. P% l$ @1 {9 F* t else {
( f+ \4 [9 H' K m_pbAlphaMask = NULL; t2 j/ T) y1 h: J6 C/ `
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H_ARRAY_DELETE( PSDPixels );. J+ ?0 [( y: x: H! {
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return DD_OK;
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: |0 X' f) Q3 c% R, \' U( a // PSD文件解包9 |7 K& @( q3 @
1 h1 K, G5 B% M# q8 o void CHades2DSurface::UnPackPSD( FILE *fp, // fp为PSD文件指针,
% p! p+ I& B6 V+ w2 d DWORD dwWidth, // dwWidth、dwHeight为宽高,
4 t: I) B/ p, |' q DWORD dwHeight,2 X \' F; p, N9 V
BYTE* pixels, // pixels为解包目标指针,) B* T, c2 U6 p/ b: v: c
WORD ChannelCnt, // ChannelCnt为通道数,8 Y4 ?$ h1 ^& `! w
WORD Compression ) // Compression位压缩类型。
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int Default[4] = { 0, 0, 0, 255 };
8 t8 ?& `0 S$ j( i( u+ ^ int chn[4] = { 2, 1, 0, 3};
0 A: i# ?6 X6 ~! ~ int PixelCount = dwWidth * dwHeight;
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if ( Compression ) {7 s% H( e% p. v- u% Q
fseek( fp, dwHeight * ChannelCnt * 2, SEEK_CUR );7 t* N0 P3 a0 K' l4 S b
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for ( int c = 0; c < 4; c++ ) {3 U' r _& a/ M
int pn = 0;
& i3 B! J/ U/ L( `: ~9 J int channel = chn[c];
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# x& x `/ R, @% S if ( channel >= ChannelCnt ) {
0 C8 c( Z" W7 S! Z1 o& g for ( pn=0; pn < PixelCount ;pn++ ) {+ |. i: E/ O+ z9 I" v/ V
pixels[ ( pn * 4 ) + channel ] = Default[ channel ];
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( T) T+ o8 \- x else // 非压缩
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int count = 0;
1 ^9 n" N1 D1 ]: f+ l while( count < PixelCount ) {- L# Q, ]. l3 X
int len = fgetc( fp );
9 _# h$ D! Z7 R2 c if( len == 128 ) { }7 c! W9 }3 ]9 f2 }
else if ( len < 128 ) // 非RLE
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len++;
& t$ @' U! V+ ~+ r; Z count += len;
% L+ E- G' v# w/ R4 \# O1 ~ while(len) {" m) M! ~ Y% Z3 ?9 U6 r
pixels[ ( pn * 4 ) + channel ] = fgetc( fp );
* r( U8 r. L7 j6 \7 ^$ T5 k8 K pn++;) P) H [* z n
len--;' B# o7 f5 }5 e1 H$ P# ?1 p
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else if ( len > 128 ) // RLE打包1 ^+ H% x9 f4 E! E4 G
{
- ` q+ ^- n7 {+ z0 S len ^= 0x0FF;
' z2 w- I( F5 X: j# h len += 2;
! f+ `4 l+ h1 Q8 }/ A/ f! W: ? unsigned char val = fgetc( fp );
% n% P$ F% F" ^7 L; b. P count += len;' W$ M+ |2 l9 @0 `- n
while( len ) {3 l, h: M( C6 s# e
pixels[ ( pn * 4 ) + channel ] = val;
( L9 F1 x( G& S2 |" d pn++;
/ i8 x- ^! u. N2 r, b len--;" f& a- O4 P2 C! z7 [
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}
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}
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else" H; X" o& l% e- v9 U
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for ( int c=0; c < 4; c++ ) {
* {, c7 i& k8 ]9 L9 s* |1 b int channel = chn[c];
0 L% M, H: O; g. t* P" B if ( channel > ChannelCnt ) {
: y' h5 ^' H! ?* S! X8 {9 D for( int pn = 0; pn < PixelCount; pn++ ) {9 _! I `5 ]+ p, a8 H3 c
pixels[ ( pn * 4 ) + channel ] = Default[ channel ];
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}
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for( int n = 0; n < PixelCount; n++ ) {
, ? u$ P* a1 W0 G9 G7 j3 k6 g. O. G7 ? pixels[ ( n * 4 ) + channel ] = fgetc( fp );
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}
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