texstore.c

这是一个开放源代码的与WINNT/WIN2K/WIN2003兼容的操作系统

                        + dstZoffset * dstImageStride
                        + dstYoffset * dstRowStride
                        + dstXoffset * dstFormat->TexelBytes;
      GLint img, row, col;
      if (!tempImage)
         return GL_FALSE;
      _mesa_adjust_image_for_convolution(ctx, dims, &srcWidth, &srcHeight);
      for (img = 0; img < srcDepth; img++) {
         GLubyte *dstRow = dstImage;
         for (row = 0; row < srcHeight; row++) {
            GLushort *dstUS = (GLushort *) dstRow;
            /* check for byteswapped format */
            if (dstFormat == &_mesa_texformat_rgb565) {
               for (col = 0; col < srcWidth; col++) {
                  dstUS[col] = PACK_COLOR_565( CHAN_TO_UBYTE(src[RCOMP]),
                                               CHAN_TO_UBYTE(src[GCOMP]),
                                               CHAN_TO_UBYTE(src[BCOMP]) );
                  src += 3;
               }
            }
            else {
               for (col = 0; col < srcWidth; col++) {
                  dstUS[col] = PACK_COLOR_565_REV( CHAN_TO_UBYTE(src[RCOMP]),
                                                   CHAN_TO_UBYTE(src[GCOMP]),
                                                   CHAN_TO_UBYTE(src[BCOMP]) );
                  src += 3;
               }
            }
            dstRow += dstRowStride;
         }
         dstImage += dstImageStride;
      }
      _mesa_free((void *) tempImage);
   }
   return GL_TRUE;
}


GLboolean
_mesa_texstore_rgba8888(STORE_PARAMS)
{
   const GLuint ui = 1;
   const GLubyte littleEndian = *((const GLubyte *) &ui);

   (void)littleEndian;
   ASSERT(dstFormat == &_mesa_texformat_rgba8888 ||
          dstFormat == &_mesa_texformat_rgba8888_rev);
   ASSERT(dstFormat->TexelBytes == 4);

   if (!ctx->_ImageTransferState &&
       !srcPacking->SwapBytes &&
       dstFormat == &_mesa_texformat_rgba8888 &&
       baseInternalFormat == GL_RGBA &&
      ((srcFormat == GL_RGBA && srcType == GL_UNSIGNED_INT_8_8_8_8) ||
       (srcFormat == GL_ABGR_EXT && srcType == GL_UNSIGNED_INT_8_8_8_8_REV))) {
      /* simple memcpy path */
      memcpy_texture(ctx, dims,
                     dstFormat, dstAddr, dstXoffset, dstYoffset, dstZoffset,
                     dstRowStride, dstImageStride,
                     srcWidth, srcHeight, srcDepth, srcFormat, srcType,
                     srcAddr, srcPacking);
   }
#if 0
   else if (!ctx->_ImageTransferState &&
	    !srcPacking->SwapBytes &&
	    srcType == GL_UNSIGNED_BYTE && 
	    dstFormat == &_mesa_texformat_rgba8888 &&
	    littleEndian &&
	    /* Three texture formats involved: srcFormat,
	     * baseInternalFormat and destFormat (GL_RGBA). Only two
	     * may differ. _mesa_swizzle_ubyte_image can't handle two
	     * propagations at once correctly. */
	    (srcFormat == baseInternalFormat ||
	     baseInternalFormat == GL_RGBA) &&
	    can_swizzle(srcFormat)) {
      GLubyte dstmap[4];

      /* dstmap - how to swizzle from GL_RGBA to dst format:
       *
       * FIXME - add !litteEndian and _rev varients:
       */
      dstmap[3] = 0;
      dstmap[2] = 1;
      dstmap[1] = 2;
      dstmap[0] = 3;
      
      _mesa_swizzle_ubyte_image(ctx, dims,
				srcFormat,
				dstmap, 4,
				dstAddr, dstXoffset, dstYoffset, dstZoffset,
				dstRowStride, dstImageStride,
				srcWidth, srcHeight, srcDepth, srcAddr,
				srcPacking);      
   }
#endif
   else {
      /* general path */
      const GLchan *tempImage = _mesa_make_temp_chan_image(ctx, dims,
                                                 baseInternalFormat,
                                                 dstFormat->BaseFormat,
                                                 srcWidth, srcHeight, srcDepth,
                                                 srcFormat, srcType, srcAddr,
                                                 srcPacking);
      const GLchan *src = tempImage;
      GLubyte *dstImage = (GLubyte *) dstAddr
                        + dstZoffset * dstImageStride
                        + dstYoffset * dstRowStride
                        + dstXoffset * dstFormat->TexelBytes;
      GLint img, row, col;
      if (!tempImage)
         return GL_FALSE;
      _mesa_adjust_image_for_convolution(ctx, dims, &srcWidth, &srcHeight);
      for (img = 0; img < srcDepth; img++) {
         GLubyte *dstRow = dstImage;
         for (row = 0; row < srcHeight; row++) {
            GLuint *dstUI = (GLuint *) dstRow;
            if (dstFormat == &_mesa_texformat_rgba8888) {
               for (col = 0; col < srcWidth; col++) {
                  dstUI[col] = PACK_COLOR_8888( CHAN_TO_UBYTE(src[RCOMP]),
                                                CHAN_TO_UBYTE(src[GCOMP]),
                                                CHAN_TO_UBYTE(src[BCOMP]),
                                                CHAN_TO_UBYTE(src[ACOMP]) );
                  src += 4;
               }
            }
            else {
               for (col = 0; col < srcWidth; col++) {
                  dstUI[col] = PACK_COLOR_8888_REV( CHAN_TO_UBYTE(src[RCOMP]),
                                                    CHAN_TO_UBYTE(src[GCOMP]),
                                                    CHAN_TO_UBYTE(src[BCOMP]),
                                                    CHAN_TO_UBYTE(src[ACOMP]) );
                  src += 4;
               }
            }
            dstRow += dstRowStride;
         }
         dstImage += dstImageStride;
      }
      _mesa_free((void *) tempImage);
   }
   return GL_TRUE;
}


GLboolean
_mesa_texstore_argb8888(STORE_PARAMS)
{
   const GLuint ui = 1;
   const GLubyte littleEndian = *((const GLubyte *) &ui);

   ASSERT(dstFormat == &_mesa_texformat_argb8888 ||
          dstFormat == &_mesa_texformat_argb8888_rev);
   ASSERT(dstFormat->TexelBytes == 4);

   if (!ctx->_ImageTransferState &&
       !srcPacking->SwapBytes &&
       dstFormat == &_mesa_texformat_argb8888 &&
       baseInternalFormat == GL_RGBA &&
       srcFormat == GL_BGRA &&
       ((srcType == GL_UNSIGNED_BYTE && littleEndian) ||
        srcType == GL_UNSIGNED_INT_8_8_8_8_REV)) {
      /* simple memcpy path (little endian) */
      memcpy_texture(ctx, dims,
                     dstFormat, dstAddr, dstXoffset, dstYoffset, dstZoffset,
                     dstRowStride, dstImageStride,
                     srcWidth, srcHeight, srcDepth, srcFormat, srcType,
                     srcAddr, srcPacking);
   }
   else if (!ctx->_ImageTransferState &&
       !srcPacking->SwapBytes &&
       dstFormat == &_mesa_texformat_argb8888_rev &&
       baseInternalFormat == GL_RGBA &&
       srcFormat == GL_BGRA &&
       ((srcType == GL_UNSIGNED_BYTE && !littleEndian) ||
        srcType == GL_UNSIGNED_INT_8_8_8_8)) {
      /* simple memcpy path (big endian) */
      memcpy_texture(ctx, dims,
                     dstFormat, dstAddr, dstXoffset, dstYoffset, dstZoffset,
                     dstRowStride, dstImageStride,
                     srcWidth, srcHeight, srcDepth, srcFormat, srcType,
                     srcAddr, srcPacking);
   }
   else if (!ctx->_ImageTransferState &&
            !srcPacking->SwapBytes &&
	    dstFormat == &_mesa_texformat_argb8888 &&
            srcFormat == GL_RGB &&
            srcType == GL_UNSIGNED_BYTE) {

      int img, row, col;
      GLubyte *dstImage = (GLubyte *) dstAddr
                        + dstZoffset * dstImageStride
                        + dstYoffset * dstRowStride
                        + dstXoffset * dstFormat->TexelBytes;
      for (img = 0; img < srcDepth; img++) {
         const GLint srcRowStride = _mesa_image_row_stride(srcPacking,
                                                 srcWidth, srcFormat, srcType);
         GLubyte *srcRow = (GLubyte *) _mesa_image_address(dims, srcPacking,
                  srcAddr, srcWidth, srcHeight, srcFormat, srcType, img, 0, 0);
         GLubyte *dstRow = dstImage;
         for (row = 0; row < srcHeight; row++) {
            for (col = 0; col < srcWidth; col++) {
               dstRow[col * 4 + 0] = srcRow[col * 3 + BCOMP];
               dstRow[col * 4 + 1] = srcRow[col * 3 + GCOMP];
               dstRow[col * 4 + 2] = srcRow[col * 3 + RCOMP];
               dstRow[col * 4 + 3] = 0xff;
            }
            dstRow += dstRowStride;
            srcRow += srcRowStride;
         }
         dstImage += dstImageStride;
      }
   }
   else if (!ctx->_ImageTransferState &&
            !srcPacking->SwapBytes &&
	    dstFormat == &_mesa_texformat_argb8888 &&
            srcFormat == GL_RGBA &&
            srcType == GL_UNSIGNED_BYTE) {

      int img, row, col;
      GLubyte *dstImage = (GLubyte *) dstAddr
                        + dstZoffset * dstImageStride
                        + dstYoffset * dstRowStride
                        + dstXoffset * dstFormat->TexelBytes;
      for (img = 0; img < srcDepth; img++) {
         const GLint srcRowStride = _mesa_image_row_stride(srcPacking,
                                                 srcWidth, srcFormat, srcType);
         GLubyte *srcRow = (GLubyte *) _mesa_image_address(dims, srcPacking,
                  srcAddr, srcWidth, srcHeight, srcFormat, srcType, img, 0, 0);
         GLubyte *dstRow = dstImage;
         for (row = 0; row < srcHeight; row++) {
            for (col = 0; col < srcWidth; col++) {
               dstRow[col * 4 + 0] = srcRow[col * 4 + BCOMP];
               dstRow[col * 4 + 1] = srcRow[col * 4 + GCOMP];
               dstRow[col * 4 + 2] = srcRow[col * 4 + RCOMP];
               dstRow[col * 4 + 3] = srcRow[col * 4 + ACOMP];
            }
            dstRow += dstRowStride;
            srcRow += srcRowStride;
         }
         dstImage += dstImageStride;
      }
   }
   else if (!ctx->_ImageTransferState &&
	    !srcPacking->SwapBytes &&
	    dstFormat == &_mesa_texformat_argb8888 &&
	    srcType == GL_UNSIGNED_BYTE && 
	    littleEndian &&
	    /* Three texture formats involved: srcFormat,
	     * baseInternalFormat and destFormat (GL_RGBA). Only two
	     * may differ. _mesa_swizzle_ubyte_image can't handle two
	     * propagations at once correctly. */
	    (srcFormat == baseInternalFormat ||
	     baseInternalFormat == GL_RGBA) &&
	    can_swizzle(srcFormat)) {

      GLubyte dstmap[4];

      /* dstmap - how to swizzle from GL_RGBA to dst format:
       */
      dstmap[3] = 3;		/* alpha */
      dstmap[2] = 0;		/* red */
      dstmap[1] = 1;		/* green */
      dstmap[0] = 2;		/* blue */
 
      _mesa_swizzle_ubyte_image(ctx, dims,
				srcFormat,
				dstmap, 4,
				dstAddr, dstXoffset, dstYoffset, dstZoffset,
				dstRowStride, dstImageStride,
				srcWidth, srcHeight, srcDepth, srcAddr,
				srcPacking);      
   }
   else {
      /* general path */
      const GLchan *tempImage = _mesa_make_temp_chan_image(ctx, dims,
                                                 baseInternalFormat,
                                                 dstFormat->BaseFormat,
                                                 srcWidth, srcHeight, srcDepth,
                                                 srcFormat, srcType, srcAddr,
                                                 srcPacking);
      const GLchan *src = tempImage;
      GLubyte *dstImage = (GLubyte *) dstAddr
                        + dstZoffset * dstImageStride
                        + dstYoffset * dstRowStride
                        + dstXoffset * dstFormat->TexelBytes;
      GLint img, row, col;
      if (!tempImage)
         return GL_FALSE;
      _mesa_adjust_image_for_convolution(ctx, dims, &srcWidth, &srcHeight);
      for (img = 0; img < srcDepth; img++) {
         GLubyte *dstRow = dstImage;
         for (row = 0; row < srcHeight; row++) {
            GLuint *dstUI = (GLuint *) dstRow;
            if (dstFormat == &_mesa_texformat_argb8888) {
               for (col = 0; col < srcWidth; col++) {
                  dstUI[col] = PACK_COLOR_8888( CHAN_TO_UBYTE(src[ACOMP]),
                                                CHAN_TO_UBYTE(src[RCOMP]),
                                                CHAN_TO_UBYTE(src[GCOMP]),
                                                CHAN_TO_UBYTE(src[BCOMP]) );
                  src += 4;
               }
            }
            else {
               for (col = 0; col < srcWidth; col++) {
                  dstUI[col] = PACK_COLOR_8888_REV( CHAN_TO_UBYTE(src[ACOMP]),
                                                    CHAN_TO_UBYTE(src[RCOMP]),
                                                    CHAN_TO_UBYTE(src[GCOMP]),
                                                    CHAN_TO_UBYTE(src[BCOMP]) );
                  src += 4;
               }
            }
            dstRow += dstRowStride;
         }
         dstImage += dstImageStride;
      }
      _mesa_free((void *) tempImage);
   }
   return GL_TRUE;
}


GLboolean
_mesa_texstore_rgb888(STORE_PARAMS)
{
   const GLuint ui = 1;
   const GLubyte littleEndian = *((const GLubyte *) &ui);

   ASSERT(dstFormat == &_mesa_texformat_rgb888);
   ASSERT(dstFormat->TexelBytes == 3);

   if (!ctx->_ImageTransferState &&
       !srcPacking->SwapBytes &&
       baseInternalFormat == GL_RGB &&
       srcFormat == GL_BGR &&
       srcType == GL_UNSIGNED_BYTE &&
       littleEndian) {
      /* simple memcpy path */
      memcpy_texture(ctx, dims,