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127 lines
3.5 KiB
C++
127 lines
3.5 KiB
C++
#include "GIFWriter.h"
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#include "api__gif.h"
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#include <wchar.h>
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#include <bfc/platform/strcmp.h>
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extern "C" {
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#include "gif_lib.h"
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};
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// valid items include "quality" for jpeg files with value "0" to "100"
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// return value is 1 if the config item is supported, 0 if it is not.
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int GIFWriter::setConfig(const wchar_t * item, const wchar_t * value) {
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return 0; // no config yet
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}
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// valid items include "quality" for jpeg files with value "0" to "100", "lossless" returns "1" if it is "0" otherwise
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// return value is 1 if the config item is supported, 0 if it is not.
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int GIFWriter::getConfig(const wchar_t * item, wchar_t * value, int valuelen) {
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if(!_wcsicmp(item,L"lossless")) lstrcpynW(value,L"0",valuelen);
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else return 0;
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return 1;
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}
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// returns 1 if the bit depth is supported (eg 32 for ARGB32, 24 for RGB24)
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// ARGB32 MUST be supported
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int GIFWriter::bitDepthSupported(int depth) {
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if(depth == 32 || depth == 24) return 1;
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return 0;
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}
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typedef struct {
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BYTE * data;
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unsigned int len;
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unsigned int alloc;
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} writeStruct;
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extern "C" int MyOutputFunc(GifFileType * gif, const GifByteType * data, int len) {
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writeStruct * p = (writeStruct *)gif->UserData;
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while (len + p->len > p->alloc) { // allocate more memory
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int d = ((p->alloc / 4) & 0xffffff00) + 0x100;
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if(d < 4096) d = 4096;
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p->alloc+=d;
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p->data = (BYTE*)WASABI_API_MEMMGR->sysRealloc(p->data,p->alloc);
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}
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memcpy(p->data+p->len,data,len);
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p->len += len;
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return len;
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}
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// returns the image in our format, free the returned buffer with api_memmgr::sysFree()
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void * GIFWriter::convert(const void *pixels, int bitDepth, int w, int h, int *length) {
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// split into planes
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BYTE *redplane, *blueplane, *greenplane;
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redplane = (BYTE *)malloc(w*h*sizeof(BYTE));
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greenplane = (BYTE *)malloc(w*h*sizeof(BYTE));
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blueplane = (BYTE *)malloc(w*h*sizeof(BYTE));
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BYTE * px = (BYTE *)pixels;
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BYTE * end = px + (w * h * (bitDepth/8));
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int i=0;
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if(bitDepth == 24) {
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while(px < end) {
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blueplane[i] = *(px++);
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greenplane[i] = *(px++);
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redplane[i] = *(px++);
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i++;
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}
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} else if(bitDepth == 32) {
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while(px < end) {
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blueplane[i] = *(px++);
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greenplane[i] = *(px++);
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redplane[i] = *(px++);
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px++;
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i++;
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}
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}
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// make a color map
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int colormapsize = 256;
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ColorMapObject * OutputColorMap = GifMakeMapObject(colormapsize, NULL);
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BYTE* OutputBuffer = (GifByteType *) malloc(w * h * sizeof(GifByteType));
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// this is actually kinda crappy
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GifQuantizeBuffer(w,h,&colormapsize,redplane,greenplane,blueplane,OutputBuffer,OutputColorMap->Colors);
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unsigned int alloc = ((w*h / 3) & 0xffffff00) + 0x100; // guess at output file size
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if(alloc < 4096) alloc = 4096;
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writeStruct write = {(BYTE*)WASABI_API_MEMMGR->sysMalloc(alloc),0,alloc};
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bool succeeded=false;
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// write the file out
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int* l_error = NULL;
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GifFileType *gif = EGifOpen(&write,MyOutputFunc, l_error);
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if(gif) {
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if(EGifPutScreenDesc(gif,w, h, 8, 0, OutputColorMap)) {
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if(EGifPutImageDesc(gif, 0, 0, w, h, FALSE, NULL)) {
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BYTE * p = OutputBuffer;
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succeeded=true;
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for (int i = 0; i < h; i++) {
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if(!EGifPutLine(gif, p, w)) {succeeded=false; break;}
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p+=w;
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}
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}
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}
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EGifCloseFile(gif, l_error);
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}
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// done!
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free(OutputBuffer);
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free(redplane);
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free(greenplane);
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free(blueplane);
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if(succeeded) {
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*length = write.len;
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return write.data;
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} else return 0;
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}
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#define CBCLASS GIFWriter
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START_DISPATCH;
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CB(GETIMAGETYPENAME, getImageTypeName);
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CB(GETEXTENSIONS, getExtensions);
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CB(SETCONFIG, setConfig);
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CB(GETCONFIG, getConfig);
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CB(BITDEPTHSUPPORTED, bitDepthSupported);
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CB(CONVERT, convert);
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END_DISPATCH;
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#undef CBCLASS |