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Aegisub
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Code Issues Releases Wiki Activity

Early PNG writing 

Originally committed to SVN as r255.
This commit is contained in:
Rodrigo Braz Monteiro 2006-03-29 23:53:42 +00:00
parent 582d671dd2
commit d7d388fb3c
2 changed files with 72 additions and 2 deletions
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71
core/subtitle_format_prs.cpp
View File

@ -36,6 +36,7 @@
///////////
// Headers
#include <wx/image.h>
#include "subtitle_format_prs.h"
#include "ass_file.h"
#include "ass_dialogue.h"
@ -49,7 +50,6 @@
#include "../prs/prs_file.h"
#include "../prs/prs_image.h"
#include "../prs/prs_display.h"
#include "../prs/prs_vsfilter_reader.h"
//////////////////////
@ -79,7 +79,7 @@ void PRSSubtitleFormat::WriteFile(wxString filename,wxString encoding) {
IScriptEnvironment *env2 = avs2.GetEnv();
// Prepare environments
wxString val = wxString::Format(_T("BlankClip(pixel_type=\"RGB32\",length=%i,width=%i,height=%i,fps=%f"),display->provider->GetFrameCount(),display->provider->GetWidth(),display->provider->GetHeight(),display->provider->GetFPS());
wxString val = wxString::Format(_T("BlankClip(pixel_type=\"RGB32\",length=%i,width=%i,height=%i,fps=%f"),display->provider->GetFrameCount(),display->provider->GetSourceWidth(),display->provider->GetSourceHeight(),display->provider->GetFPS());
AVSValue script1 = env1->Invoke("Eval",AVSValue(wxString(val + _T(",color=$000000)")).mb_str(wxConvUTF8)));
AVSValue script2 = env2->Invoke("Eval",AVSValue(wxString(val + _T(",color=$FFFFFF)")).mb_str(wxConvUTF8)));
char temp[512];
@ -110,6 +110,10 @@ void PRSSubtitleFormat::WriteFile(wxString filename,wxString encoding) {
PVideoFrame frame1 = clip1->GetFrame(framen,env1);
PVideoFrame frame2 = clip2->GetFrame(framen,env2);
// Convert to PNG
wxImage bmp = CalculateAlpha(frame1->GetReadPtr(),frame2->GetReadPtr(),frame1->GetRowSize(),frame1->GetHeight(),frame1->GetPitch());
bmp.SaveFile(filename + wxString::Format(_T("%i.png"),id),wxBITMAP_TYPE_PNG);
// Create PRSImage
PRSImage *img = new PRSImage;
img->id = id;
@ -137,3 +141,66 @@ void PRSSubtitleFormat::WriteFile(wxString filename,wxString encoding) {
file.Save(filename.mb_str(wxConvLocal));
#endif
}
//////////////////////////////////////////////
// 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;
}

3
core/subtitle_format_prs.h
View File

@ -45,6 +45,9 @@
//////////////
// PRS writer
class PRSSubtitleFormat : public SubtitleFormat {
private:
wxImage CalculateAlpha(const unsigned char* frame1, const unsigned char* frame2, int w, int h, int pitch);
public:
bool CanWriteFile(wxString filename);
void WriteFile(wxString filename,wxString encoding);