| /* |
| * Copyright (c) 2008, 2009, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| #include "utility/rect.h" |
| |
| #if defined(__cplusplus) |
| extern "C" { |
| #endif |
| |
| /** |
| * bitsPerPixel must be 32 for now. |
| * outBuf must be large enough to conatin all the rectangles. |
| */ |
| int BitmapToYXBandedRectangles(int bitsPerPixel, int width, int height, unsigned char * buf, RECT_T * outBuf) |
| { |
| //XXX: we might want to reuse the code in the splashscreen library, |
| // though we'd have to deal with the ALPHA_THRESHOLD and different |
| // image formats in this case. |
| int widthBytes = width * bitsPerPixel / 8; |
| int alignedWidth = (((widthBytes - 1) / 4) + 1) * 4; |
| |
| RECT_T * out = outBuf; |
| |
| RECT_T *pPrevLine = NULL, *pFirst = out, *pThis = pFirst; |
| int i, j, i0; |
| int length; |
| |
| for (j = 0; j < height; j++) { |
| /* generate data for a scanline */ |
| |
| unsigned char *pSrc = (unsigned char *) buf + j * alignedWidth; |
| RECT_T *pLine = pThis; |
| |
| i = 0; |
| |
| do { |
| // pSrc[0,1,2] == B,G,R; pSrc[3] == Alpha |
| while (i < width && !pSrc[3]) { |
| pSrc += 4; |
| ++i; |
| } |
| if (i >= width) |
| break; |
| i0 = i; |
| while (i < width && pSrc[3]) { |
| pSrc += 4; |
| ++i; |
| } |
| RECT_SET(*pThis, i0, j, i - i0, 1); |
| ++pThis; |
| } while (i < width); |
| |
| /* check if the previous scanline is exactly the same, merge if so |
| (this is the only optimization we can use for YXBanded rectangles, |
| and win32 supports YXBanded only */ |
| |
| length = pThis - pLine; |
| if (pPrevLine && pLine - pPrevLine == length) { |
| for (i = 0; i < length && RECT_EQ_X(pPrevLine[i], pLine[i]); ++i) { |
| } |
| if (i == pLine - pPrevLine) { |
| // do merge |
| for (i = 0; i < length; i++) { |
| RECT_INC_HEIGHT(pPrevLine[i]); |
| } |
| pThis = pLine; |
| continue; |
| } |
| } |
| /* or else use the generated scanline */ |
| |
| pPrevLine = pLine; |
| } |
| |
| return pThis - pFirst; |
| } |
| |
| #if defined(__cplusplus) |
| } |
| #endif |