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Originally committed to SVN as r257.

This commit is contained in:
Rodrigo Braz Monteiro 2006-03-30 03:32:45 +00:00
parent 6591c59afd
commit 84ffb67b04
2 changed files with 81 additions and 69 deletions
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149
core/subtitle_format_prs.cpp
View File

@ -47,6 +47,7 @@
#include "main.h"
#include "frame_main.h"
#include "vfr.h"
#include "utils.h"
#include "../prs/prs_file.h"
#include "../prs/prs_image.h"
#include "../prs/prs_display.h"
@ -143,68 +144,21 @@ void PRSSubtitleFormat::WriteFile(wxString filename,wxString encoding) {
}
///////////////////////////////////////////////////////////////////////////////////////////////////
// TODO!! MOVE THE TWO FUNCTIONS BELOW INTO A CLASS OF THEIR OWN, THEY MIGHT FIND USE ELSEWHERE. //
// Obvious choice would be the subtitles_rasterizer.h derivation for vsfilter, when that exists. //
///////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////
// Generates a 32-bit wxImage from two frames
// ------------------------------------------
// Frame 1 should have the image on a BLACK background
// Frame 2 should have the same image on a WHITE background
wxImage PRSSubtitleFormat::CalculateAlpha(const unsigned char* frame1, const unsigned char* frame2, int w, int h, int pitch) {
//// Allocate image data
//unsigned char *data = (unsigned char*) malloc(sizeof(unsigned char)*w*h*4);
//// Pointers
//const unsigned char *src1 = frame1;
//const unsigned char *src2 = frame2;
//unsigned char *dst = data + ((h-1)*w);
//// Process
//int r1,g1,b1,r2,g2,b2;
//int r,g,b,a;
//for (int y=0;y<h;y++) {
// for (int x=0;x<w;x+=4) {
// // Read pixels
// b1 = *(src1++);
// b2 = *(src2++);
// g1 = *(src1++);
// g2 = *(src2++);
// r1 = *(src1++);
// r2 = *(src2++);
// src1++;
// src2++;
// // Calculate new values
// a = 255 + r1 - r2;
// if (a == 0) {
// r = 0;
// g = 0;
// b = 0;
// }
// else {
// r = r1*255 / a;
// g = g1*255 / a;
// b = b1*255 / a;
// }
// // Write to destination
// *(dst++) = b;
// *(dst++) = g;
// *(dst++) = r;
// *(dst++) = a;
// }
// // Roll back dst
// dst -= 2*w;
//}
//// Create the actual image and return it
////return wxImage(w/4,h,data,false);
//wxBitmap bmp ((const char*)data,w/4,h,32);
//wxImage img = bmp.ConvertToImage();
//if (img.HasAlpha()) wxLogMessage(_T("Has alpha"));
//else wxLogMessage(_T("oshit."));
//return img;
// Allocate image data
unsigned char *data = (unsigned char*) malloc(sizeof(unsigned char)*w*h*3);
unsigned char *alpha = (unsigned char*) malloc(sizeof(unsigned char)*w*h);
@ -214,13 +168,17 @@ wxImage PRSSubtitleFormat::CalculateAlpha(const unsigned char* frame1, const uns
const unsigned char *src2 = frame2;
unsigned char *dst = data + ((h-1)*w*3/4);
unsigned char *dsta = alpha + ((h-1)*w/4);
int mina = 255;
int maxa = 0;
// Boundaries
int minx = w;
int miny = h;
int maxx = 0;
int maxy = 0;
// Process
int r1,g1,b1,r2,g2,b2;
int r,g,b,a;
for (int y=0;y<h;y++) {
for (int y=h;--y>=0;) {
for (int x=0;x<w;x+=4) {
// Read pixels
b1 = *(src1++);
@ -240,9 +198,19 @@ wxImage PRSSubtitleFormat::CalculateAlpha(const unsigned char* frame1, const uns
b = 0;
}
else {
r = r1*255 / a;
g = g1*255 / a;
b = b1*255 / a;
// Update range
if (x < minx) minx = x;
else if (x > maxx) maxx = x;
if (y < miny) miny = y;
else if (y > maxy) maxy = y;
// Calculate colour components
int mod;
if (a > 8) mod = 0;
else mod = 256 >> a;
r = MAX(0,r1-mod)*255 / a;
g = MAX(0,g1-mod)*255 / a;
b = MAX(0,b1-mod)*255 / a;
}
// Write to destination
@ -250,9 +218,6 @@ wxImage PRSSubtitleFormat::CalculateAlpha(const unsigned char* frame1, const uns
*(dst++) = g;
*(dst++) = b;
*(dsta++) = a;
if (a > maxa) maxa = a;
if (a < mina) mina = a;
}
// Roll back dst
@ -260,10 +225,56 @@ wxImage PRSSubtitleFormat::CalculateAlpha(const unsigned char* frame1, const uns
dsta -= w/2;
}
wxLogMessage(wxString::Format(_T("Min: %i, Max: %i"),mina,maxa));
// Create the actual image and return it
// Create the actual image
wxImage img(w/4,h,data,false);
img.SetAlpha(alpha,false);
return img;
// Return subimage
minx /= 4;
maxx /= 4;
wxImage subimg = SubImageWithAlpha(img,wxRect(minx,miny,maxx-minx+1,maxy-miny+1));
return subimg;
}
////////////////////////////////////////////////
// Creates a sub image preserving alpha channel
// Modified from wx's source
wxImage PRSSubtitleFormat::SubImageWithAlpha (wxImage source,const wxRect &rect) {
wxImage image;
wxCHECK_MSG(source.Ok(), image, wxT("invalid image") );
wxCHECK_MSG((rect.GetLeft()>=0) && (rect.GetTop()>=0) && (rect.GetRight()<=source.GetWidth()) && (rect.GetBottom()<=source.GetHeight()), image, wxT("invalid subimage size") );
int subwidth=rect.GetWidth();
const int subheight=rect.GetHeight();
image.Create(subwidth, subheight, false);
image.SetAlpha();
unsigned char *subdata = image.GetData();
unsigned char *data = source.GetData();
unsigned char *subalpha = image.GetAlpha();
unsigned char *alpha = source.GetAlpha();
wxCHECK_MSG(subdata, image, wxT("unable to create image"));
const int subleft=3*rect.GetLeft();
const int width=3*source.GetWidth();
const int afullwidth=source.GetWidth();
int awidth = subwidth;
subwidth*=3;
data+=rect.GetTop()*width+subleft;
alpha+=rect.GetTop()*afullwidth+rect.GetLeft();
for (long j = 0; j < subheight; ++j) {
memcpy(subdata, data, subwidth);
memcpy(subalpha, alpha, awidth);
subdata+=subwidth;
subalpha+=awidth;
data+=width;
alpha+=afullwidth;
}
return image;
}

1
core/subtitle_format_prs.h
View File

@ -46,6 +46,7 @@
// PRS writer
class PRSSubtitleFormat : public SubtitleFormat {
private:
wxImage SubImageWithAlpha(wxImage src,const wxRect &area);
wxImage CalculateAlpha(const unsigned char* frame1, const unsigned char* frame2, int w, int h, int pitch);
public: