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-rw-r--r--indra/llimage/llimagebmp.cpp624
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diff --git a/indra/llimage/llimagebmp.cpp b/indra/llimage/llimagebmp.cpp
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+++ b/indra/llimage/llimagebmp.cpp
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+/**
+ * @file llimagebmp.cpp
+ *
+ * Copyright (c) 2001-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+#include "linden_common.h"
+
+#include "llimagebmp.h"
+#include "llerror.h"
+
+#include "llendianswizzle.h"
+
+
+/**
+ * @struct LLBMPHeader
+ *
+ * This struct helps deal with bmp files.
+ */
+struct LLBMPHeader
+{
+ S32 mSize;
+ S32 mWidth;
+ S32 mHeight;
+ S16 mPlanes;
+ S16 mBitsPerPixel;
+ S16 mCompression;
+ S16 mAlignmentPadding; // pads out to next word boundary
+ S32 mImageSize;
+ S32 mHorzPelsPerMeter;
+ S32 mVertPelsPerMeter;
+ S32 mNumColors;
+ S32 mNumColorsImportant;
+};
+
+/**
+ * @struct Win95BmpHeaderExtension
+ */
+struct Win95BmpHeaderExtension
+{
+ U32 mReadMask;
+ U32 mGreenMask;
+ U32 mBlueMask;
+ U32 mAlphaMask;
+ U32 mColorSpaceType;
+ U16 mRed[3]; // Red CIE endpoint
+ U16 mGreen[3]; // Green CIE endpoint
+ U16 mBlue[3]; // Blue CIE endpoint
+ U32 mGamma[3]; // Gamma scale for r g and b
+};
+
+/**
+ * LLImageBMP
+ */
+LLImageBMP::LLImageBMP()
+ :
+ LLImageFormatted(IMG_CODEC_BMP),
+ mColorPaletteColors( 0 ),
+ mColorPalette( NULL ),
+ mBitmapOffset( 0 ),
+ mBitsPerPixel( 0 ),
+ mOriginAtTop( FALSE )
+{
+ mBitfieldMask[0] = 0;
+ mBitfieldMask[1] = 0;
+ mBitfieldMask[2] = 0;
+ mBitfieldMask[3] = 0;
+}
+
+LLImageBMP::~LLImageBMP()
+{
+ delete[] mColorPalette;
+}
+
+
+BOOL LLImageBMP::updateData()
+{
+ resetLastError();
+
+ // Check to make sure that this instance has been initialized with data
+ U8* mdata = getData();
+ if (!mdata || (0 == getDataSize()))
+ {
+ setLastError("Uninitialized instance of LLImageBMP");
+ return FALSE;
+ }
+
+ // Read the bitmap headers in order to get all the useful info
+ // about this image
+
+ ////////////////////////////////////////////////////////////////////
+ // Part 1: "File Header"
+ // 14 bytes consisting of
+ // 2 bytes: either BM or BA
+ // 4 bytes: file size in bytes
+ // 4 bytes: reserved (always 0)
+ // 4 bytes: bitmap offset (starting position of image data in bytes)
+ const S32 FILE_HEADER_SIZE = 14;
+ if ((mdata[0] != 'B') || (mdata[1] != 'M'))
+ {
+ if ((mdata[0] != 'B') || (mdata[1] != 'A'))
+ {
+ setLastError("OS/2 bitmap array BMP files are not supported");
+ return FALSE;
+ }
+ else
+ {
+ setLastError("Does not appear to be a bitmap file");
+ return FALSE;
+ }
+ }
+
+ mBitmapOffset = mdata[13];
+ mBitmapOffset <<= 8; mBitmapOffset += mdata[12];
+ mBitmapOffset <<= 8; mBitmapOffset += mdata[11];
+ mBitmapOffset <<= 8; mBitmapOffset += mdata[10];
+
+
+ ////////////////////////////////////////////////////////////////////
+ // Part 2: "Bitmap Header"
+ const S32 BITMAP_HEADER_SIZE = 40;
+ LLBMPHeader header;
+ llassert( sizeof( header ) == BITMAP_HEADER_SIZE );
+
+ memcpy((void *)&header, mdata + FILE_HEADER_SIZE, BITMAP_HEADER_SIZE);
+
+ // convert BMP header from little endian (no-op on little endian builds)
+ llendianswizzleone(header.mSize);
+ llendianswizzleone(header.mWidth);
+ llendianswizzleone(header.mHeight);
+ llendianswizzleone(header.mPlanes);
+ llendianswizzleone(header.mBitsPerPixel);
+ llendianswizzleone(header.mCompression);
+ llendianswizzleone(header.mAlignmentPadding);
+ llendianswizzleone(header.mImageSize);
+ llendianswizzleone(header.mHorzPelsPerMeter);
+ llendianswizzleone(header.mVertPelsPerMeter);
+ llendianswizzleone(header.mNumColors);
+ llendianswizzleone(header.mNumColorsImportant);
+
+ BOOL windows_nt_version = FALSE;
+ BOOL windows_95_version = FALSE;
+ if( 12 == header.mSize )
+ {
+ setLastError("Windows 2.x and OS/2 1.x BMP files are not supported");
+ return FALSE;
+ }
+ else
+ if( 40 == header.mSize )
+ {
+ if( 3 == header.mCompression )
+ {
+ // Windows NT
+ windows_nt_version = TRUE;
+ }
+ else
+ {
+ // Windows 3.x
+ }
+ }
+ else
+ if( 12 <= header.mSize && 64 <= header.mSize )
+ {
+ setLastError("OS/2 2.x BMP files are not supported");
+ return FALSE;
+ }
+ else
+ if( 108 == header.mSize )
+ {
+ // BITMAPV4HEADER
+ windows_95_version = TRUE;
+ }
+ else
+ if( 108 < header.mSize )
+ {
+ // BITMAPV5HEADER or greater
+ // Should work as long at Microsoft maintained backwards compatibility (which they did in V4 and V5)
+ windows_95_version = TRUE;
+ }
+
+ S32 width = header.mWidth;
+ S32 height = header.mHeight;
+ if (height < 0)
+ {
+ mOriginAtTop = TRUE;
+ height = -height;
+ }
+ else
+ {
+ mOriginAtTop = FALSE;
+ }
+
+ mBitsPerPixel = header.mBitsPerPixel;
+ S32 components;
+ switch( mBitsPerPixel )
+ {
+ case 8:
+ components = 1;
+ break;
+ case 24:
+ case 32:
+ components = 3;
+ break;
+ case 1:
+ case 4:
+ case 16: // Started work on 16, but doesn't work yet
+ // These are legal, but we don't support them yet.
+ setLastError("Unsupported bit depth");
+ return FALSE;
+ default:
+ setLastError("Unrecognized bit depth");
+ return FALSE;
+ }
+
+ setSize(width, height, components);
+
+ switch( header.mCompression )
+ {
+ case 0:
+ // Uncompressed
+ break;
+
+ case 1:
+ setLastError("8 bit RLE compression not supported.");
+ return FALSE;
+
+ case 2:
+ setLastError("4 bit RLE compression not supported.");
+ return FALSE;
+
+ case 3:
+ // Windows NT or Windows 95
+ break;
+
+ default:
+ setLastError("Unsupported compression format.");
+ return FALSE;
+ }
+
+ ////////////////////////////////////////////////////////////////////
+ // Part 3: Bitfield Masks and other color data
+ S32 extension_size = 0;
+ if( windows_nt_version )
+ {
+ if( (16 != header.mBitsPerPixel) && (32 != header.mBitsPerPixel) )
+ {
+ setLastError("Bitfield encoding requires 16 or 32 bits per pixel.");
+ return FALSE;
+ }
+
+ if( 0 != header.mNumColors )
+ {
+ setLastError("Bitfield encoding is not compatible with a color table.");
+ return FALSE;
+ }
+
+
+ extension_size = 4 * 3;
+ memcpy( mBitfieldMask, mdata + FILE_HEADER_SIZE + BITMAP_HEADER_SIZE, extension_size);
+ }
+ else
+ if( windows_95_version )
+ {
+ Win95BmpHeaderExtension win_95_extension;
+ extension_size = sizeof( win_95_extension );
+
+ llassert( sizeof( win_95_extension ) + BITMAP_HEADER_SIZE == 108 );
+ memcpy( &win_95_extension, mdata + FILE_HEADER_SIZE + BITMAP_HEADER_SIZE, sizeof( win_95_extension ) );
+
+ if( 3 == header.mCompression )
+ {
+ memcpy( mBitfieldMask, mdata + FILE_HEADER_SIZE + BITMAP_HEADER_SIZE, 4 * 4);
+ }
+
+ // Color correction ignored for now
+ }
+
+
+ ////////////////////////////////////////////////////////////////////
+ // Part 4: Color Palette (optional)
+ // Note: There's no color palette if there are 16 or more bits per pixel
+ S32 color_palette_size = 0;
+ mColorPaletteColors = 0;
+ if( header.mBitsPerPixel < 16 )
+ {
+ if( 0 == header.mNumColors )
+ {
+ mColorPaletteColors = (1 << header.mBitsPerPixel);
+ }
+ else
+ {
+ mColorPaletteColors = header.mNumColors;
+ }
+ }
+ color_palette_size = mColorPaletteColors * 4;
+
+ if( 0 != mColorPaletteColors )
+ {
+ mColorPalette = new U8[color_palette_size];
+ memcpy( mColorPalette, mdata + FILE_HEADER_SIZE + BITMAP_HEADER_SIZE + extension_size, color_palette_size );
+ }
+
+ return TRUE;
+}
+
+BOOL LLImageBMP::decode(LLImageRaw* raw_image, F32 decode_time)
+{
+ llassert_always(raw_image);
+
+ resetLastError();
+
+ // Check to make sure that this instance has been initialized with data
+ U8* mdata = getData();
+ if (!mdata || (0 == getDataSize()))
+ {
+ setLastError("llimagebmp trying to decode an image with no data!");
+ return FALSE;
+ }
+
+ raw_image->resize(getWidth(), getHeight(), 3);
+
+ U8* src = mdata + mBitmapOffset;
+ U8* dst = raw_image->getData();
+
+ BOOL success = FALSE;
+
+ switch( mBitsPerPixel )
+ {
+ case 8:
+ if( mColorPaletteColors >= 256 )
+ {
+ success = decodeColorTable8( dst, src );
+ }
+ break;
+
+ case 16:
+ success = decodeColorMask16( dst, src );
+ break;
+
+ case 24:
+ success = decodeTruecolor24( dst, src );
+ break;
+
+ case 32:
+ success = decodeColorMask32( dst, src );
+ break;
+ }
+
+ if( success && mOriginAtTop )
+ {
+ raw_image->verticalFlip();
+ }
+
+ return success;
+}
+
+U32 LLImageBMP::countTrailingZeros( U32 m )
+{
+ U32 shift_count = 0;
+ while( !(m & 1) )
+ {
+ shift_count++;
+ m >>= 1;
+ }
+ return shift_count;
+}
+
+
+BOOL LLImageBMP::decodeColorMask16( U8* dst, U8* src )
+{
+ llassert( 16 == mBitsPerPixel );
+
+ if( !mBitfieldMask[0] && !mBitfieldMask[1] && !mBitfieldMask[2] )
+ {
+ // Use default values
+ mBitfieldMask[0] = 0x00007C00;
+ mBitfieldMask[1] = 0x000003E0;
+ mBitfieldMask[2] = 0x0000001F;
+ }
+
+ S32 src_row_span = getWidth() * 2;
+ S32 alignment_bytes = (3 * src_row_span) % 4; // round up to nearest multiple of 4
+
+ U32 r_shift = countTrailingZeros( mBitfieldMask[2] );
+ U32 g_shift = countTrailingZeros( mBitfieldMask[1] );
+ U32 b_shift = countTrailingZeros( mBitfieldMask[0] );
+
+ for( S32 row = 0; row < getHeight(); row++ )
+ {
+ for( S32 col = 0; col < getWidth(); col++ )
+ {
+ U32 value = *((U16*)src);
+ dst[0] = U8((value & mBitfieldMask[2]) >> r_shift); // Red
+ dst[1] = U8((value & mBitfieldMask[1]) >> g_shift); // Green
+ dst[2] = U8((value & mBitfieldMask[0]) >> b_shift); // Blue
+ src += 2;
+ dst += 3;
+ }
+ src += alignment_bytes;
+ }
+
+ return TRUE;
+}
+
+BOOL LLImageBMP::decodeColorMask32( U8* dst, U8* src )
+{
+ // Note: alpha is not supported
+
+ llassert( 32 == mBitsPerPixel );
+
+ if( !mBitfieldMask[0] && !mBitfieldMask[1] && !mBitfieldMask[2] )
+ {
+ // Use default values
+ mBitfieldMask[0] = 0x00FF0000;
+ mBitfieldMask[1] = 0x0000FF00;
+ mBitfieldMask[2] = 0x000000FF;
+ }
+
+
+ S32 src_row_span = getWidth() * 4;
+ S32 alignment_bytes = (3 * src_row_span) % 4; // round up to nearest multiple of 4
+
+ U32 r_shift = countTrailingZeros( mBitfieldMask[0] );
+ U32 g_shift = countTrailingZeros( mBitfieldMask[1] );
+ U32 b_shift = countTrailingZeros( mBitfieldMask[2] );
+
+ for( S32 row = 0; row < getHeight(); row++ )
+ {
+ for( S32 col = 0; col < getWidth(); col++ )
+ {
+ U32 value = *((U32*)src);
+ dst[0] = U8((value & mBitfieldMask[0]) >> r_shift); // Red
+ dst[1] = U8((value & mBitfieldMask[1]) >> g_shift); // Green
+ dst[2] = U8((value & mBitfieldMask[2]) >> b_shift); // Blue
+ src += 4;
+ dst += 3;
+ }
+ src += alignment_bytes;
+ }
+
+ return TRUE;
+}
+
+
+BOOL LLImageBMP::decodeColorTable8( U8* dst, U8* src )
+{
+ llassert( (8 == mBitsPerPixel) && (mColorPaletteColors >= 256) );
+
+ S32 src_row_span = getWidth() * 1;
+ S32 alignment_bytes = (3 * src_row_span) % 4; // round up to nearest multiple of 4
+
+ for( S32 row = 0; row < getHeight(); row++ )
+ {
+ for( S32 col = 0; col < getWidth(); col++ )
+ {
+ S32 index = 4 * src[0];
+ dst[0] = mColorPalette[index + 2]; // Red
+ dst[1] = mColorPalette[index + 1]; // Green
+ dst[2] = mColorPalette[index + 0]; // Blue
+ src++;
+ dst += 3;
+ }
+ src += alignment_bytes;
+ }
+
+ return TRUE;
+}
+
+
+BOOL LLImageBMP::decodeTruecolor24( U8* dst, U8* src )
+{
+ llassert( 24 == mBitsPerPixel );
+ llassert( 3 == getComponents() );
+ S32 src_row_span = getWidth() * 3;
+ S32 alignment_bytes = (3 * src_row_span) % 4; // round up to nearest multiple of 4
+
+ for( S32 row = 0; row < getHeight(); row++ )
+ {
+ for( S32 col = 0; col < getWidth(); col++ )
+ {
+ dst[0] = src[2]; // Red
+ dst[1] = src[1]; // Green
+ dst[2] = src[0]; // Blue
+ src += 3;
+ dst += 3;
+ }
+ src += alignment_bytes;
+ }
+
+ return TRUE;
+}
+
+BOOL LLImageBMP::encode(const LLImageRaw* raw_image, F32 encode_time)
+{
+ llassert_always(raw_image);
+
+ resetLastError();
+
+ S32 src_components = raw_image->getComponents();
+ S32 dst_components = ( src_components < 3 ) ? 1 : 3;
+
+ if( (2 == src_components) || (4 == src_components) )
+ {
+ llinfos << "Dropping alpha information during BMP encoding" << llendl;
+ }
+
+ setSize(raw_image->getWidth(), raw_image->getHeight(), dst_components);
+
+ U8 magic[14];
+ LLBMPHeader header;
+ int header_bytes = 14+sizeof(header);
+ llassert(header_bytes == 54);
+ if (getComponents() == 1)
+ {
+ header_bytes += 1024; // Need colour LUT.
+ }
+ int line_bytes = getComponents() * getWidth();
+ int alignment_bytes = (3 * line_bytes) % 4;
+ line_bytes += alignment_bytes;
+ int file_bytes = line_bytes*getHeight() + header_bytes;
+
+ // Allocate the new buffer for the data.
+ allocateData(file_bytes);
+
+ magic[0] = 'B'; magic[1] = 'M';
+ magic[2] = (U8) file_bytes;
+ magic[3] = (U8)(file_bytes>>8);
+ magic[4] = (U8)(file_bytes>>16);
+ magic[5] = (U8)(file_bytes>>24);
+ magic[6] = magic[7] = magic[8] = magic[9] = 0;
+ magic[10] = (U8) header_bytes;
+ magic[11] = (U8)(header_bytes>>8);
+ magic[12] = (U8)(header_bytes>>16);
+ magic[13] = (U8)(header_bytes>>24);
+ header.mSize = 40;
+ header.mWidth = getWidth();
+ header.mHeight = getHeight();
+ header.mPlanes = 1;
+ header.mBitsPerPixel = (getComponents()==1)?8:24;
+ header.mCompression = 0;
+ header.mAlignmentPadding = 0;
+ header.mImageSize = 0;
+#if LL_DARWIN
+ header.mHorzPelsPerMeter = header.mVertPelsPerMeter = 2834; // 72dpi
+#else
+ header.mHorzPelsPerMeter = header.mVertPelsPerMeter = 0;
+#endif
+ header.mNumColors = header.mNumColorsImportant = 0;
+
+ // convert BMP header to little endian (no-op on little endian builds)
+ llendianswizzleone(header.mSize);
+ llendianswizzleone(header.mWidth);
+ llendianswizzleone(header.mHeight);
+ llendianswizzleone(header.mPlanes);
+ llendianswizzleone(header.mBitsPerPixel);
+ llendianswizzleone(header.mCompression);
+ llendianswizzleone(header.mAlignmentPadding);
+ llendianswizzleone(header.mImageSize);
+ llendianswizzleone(header.mHorzPelsPerMeter);
+ llendianswizzleone(header.mVertPelsPerMeter);
+ llendianswizzleone(header.mNumColors);
+ llendianswizzleone(header.mNumColorsImportant);
+
+ U8* mdata = getData();
+
+ // Output magic, then header, then the palette table, then the data.
+ U32 cur_pos = 0;
+ memcpy(mdata, magic, 14);
+ cur_pos += 14;
+ memcpy(mdata+cur_pos, &header, 40);
+ cur_pos += 40;
+ if (getComponents() == 1)
+ {
+ S32 n;
+ for (n=0; n < 256; n++)
+ {
+ mdata[cur_pos++] = (U8)n;
+ mdata[cur_pos++] = (U8)n;
+ mdata[cur_pos++] = (U8)n;
+ mdata[cur_pos++] = 0;
+ }
+ }
+
+ // Need to iterate through, because we need to flip the RGB.
+ const U8* src = raw_image->getData();
+ U8* dst = mdata + cur_pos;
+
+ for( S32 row = 0; row < getHeight(); row++ )
+ {
+ for( S32 col = 0; col < getWidth(); col++ )
+ {
+ switch( src_components )
+ {
+ case 1:
+ *dst++ = *src++;
+ break;
+ case 2:
+ {
+ U32 lum = src[0];
+ U32 alpha = src[1];
+ *dst++ = (U8)(lum * alpha / 255);
+ src += 2;
+ break;
+ }
+ case 3:
+ case 4:
+ dst[0] = src[2];
+ dst[1] = src[1];
+ dst[2] = src[0];
+ src += src_components;
+ dst += 3;
+ break;
+ }
+
+ for( S32 i = 0; i < alignment_bytes; i++ )
+ {
+ *dst++ = 0;
+ }
+ }
+ }
+
+ return TRUE;
+}
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