forked from mia/Aegisub
126 lines
3.4 KiB
C++
126 lines
3.4 KiB
C++
// Copyright (c) 2005, Rodrigo Braz Monteiro
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of the Aegisub Group nor the names of its contributors
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// may be used to endorse or promote products derived from this software
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// without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// -----------------------------------------------------------------------------
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//
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// AEGISUB
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//
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// Website: http://aegisub.cellosoft.com
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// Contact: mailto:zeratul@cellosoft.com
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//
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///////////
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// Headers
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#include "prs_video_frame.h"
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//////////
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// Macros
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#ifndef MIN
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#define MIN(a,b) ((a)<(b))?(a):(b)
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#endif
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#ifndef MAX
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#define MAX(a,b) ((a)>(b))?(a):(b)
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#endif
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#ifndef MID
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#define MID(a,b,c) MAX(a,MIN(b,c))
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#endif
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///////////////
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// Constructor
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PRSVideoFrame::PRSVideoFrame () {
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for (int i=0;i<4;i++) data[i] = 0;
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w = 0;
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h = 0;
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ownData = false;
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}
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//////////////
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// Destructor
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PRSVideoFrame::~PRSVideoFrame () {
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if (ownData) {
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for (int i=0;i<4;i++) delete [] data[i];
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}
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}
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///////////////////////////////////
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// Overlay frame on top of another
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void PRSVideoFrame::Overlay(PRSVideoFrame *dstFrame,int x,int y,unsigned char alpha,unsigned char blend) {
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// TODO: Colorspace conversion, for now, the function assumes RGB32 on RGB32!
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// Get pointers
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const unsigned char *src;
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unsigned char *dst;
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// Get boundaries
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int srcBpp = 4;
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int dstBpp = 4;
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int srcRowLen = pitch;
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int dstRowLen = dstFrame->pitch;
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int dstStarty = MAX(0,y);
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int dstEndy = MIN(y+h,dstFrame->h);
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int height = dstEndy - dstStarty;
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int rowLen = MID(0,w,dstFrame->w - x);
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// Values
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char sc1,sc2,sc3,a,ia;
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char dc1,dc2,dc3,da;
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// Draw each row
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for (int j=0;j<height;j++) {
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src = (const unsigned char *) data[0] + j*srcRowLen;
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dst = (unsigned char *) dstFrame->data[0] + (j+dstStarty)*dstRowLen + x*dstBpp;
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// Draw the row
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for (int i=0;i<rowLen;i++) {
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// Read alpha
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a = *src++;
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da = *dst;
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ia = 255-a;
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// Read colors
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sc1 = *src++;
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dc1 = *(dst+1);
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sc2 = *src++;
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dc2 = *(dst+2);
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sc3 = *src++;
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dc3 = *(dst+3);
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// Write colors
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*dst++ = 255-(ia*(255-da)/255);
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*dst++ = (sc1*a + dc1*ia)/255;
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*dst++ = (sc2*a + dc2*ia)/255;
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*dst++ = (sc3*a + dc3*ia)/255;
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}
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}
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}
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