mirror of
https://github.com/unknownworlds/NS.git
synced 2024-12-11 13:21:17 +00:00
94 lines
2.8 KiB
C++
94 lines
2.8 KiB
C++
|
#include "png.h"
|
||
|
|
#include "loadpng.h"
|
||
|
|
#include "cl_dll/wrect.h"
|
||
|
|
#include "cl_dll/cl_dll.h"
|
||
|
|
#include "MemoryInputStream.h"
|
||
|
|
|
||
|
|
//alternate read function for libpng
|
||
|
|
void png_read_vgui_stream(png_structp png_ptr, png_bytep data, png_size_t length);
|
||
|
|
|
||
|
|
//conversion util to change from libpng format to raw bitmap
|
||
|
|
void convertToUChar(png_infop png_info, png_bytepp rows, uchar* data);
|
||
|
|
|
||
|
|
BitmapPNG* LoadPNG(char const *pFilename)
|
||
|
|
{
|
||
|
|
int length;
|
||
|
|
uchar* data = gEngfuncs.COM_LoadFile((char*)pFilename, 5, &length);
|
||
|
|
if( !data ) { return NULL; }
|
||
|
|
|
||
|
|
MemoryInputStream stream(data,length);
|
||
|
|
|
||
|
|
BitmapPNG* pRet = LoadPNG(stream);
|
||
|
|
|
||
|
|
gEngfuncs.COM_FreeFile(data);
|
||
|
|
|
||
|
|
return pRet;
|
||
|
|
}
|
||
|
|
|
||
|
|
BitmapPNG* LoadPNG(uchar* data, int length)
|
||
|
|
{
|
||
|
|
if( !data ) { return NULL; }
|
||
|
|
MemoryInputStream stream(data,length);
|
||
|
|
return LoadPNG(stream);
|
||
|
|
}
|
||
|
|
|
||
|
|
BitmapPNG* LoadPNG(vgui::InputStream& stream)
|
||
|
|
{
|
||
|
|
//allocate structures for read
|
||
|
|
png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
|
||
|
|
if (!png_ptr)
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
png_infop info_ptr = png_create_info_struct(png_ptr);
|
||
|
|
if (!info_ptr)
|
||
|
|
{
|
||
|
|
png_destroy_read_struct(&png_ptr,
|
||
|
|
(png_infopp)NULL, (png_infopp)NULL);
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
//set up our alternate read function
|
||
|
|
png_set_read_fn(png_ptr,&stream,png_read_vgui_stream);
|
||
|
|
|
||
|
|
//read the image
|
||
|
|
png_read_png(png_ptr,info_ptr,PNG_TRANSFORM_PACKING | PNG_TRANSFORM_STRIP_16,NULL);
|
||
|
|
png_bytepp rows = png_get_rows(png_ptr, info_ptr);
|
||
|
|
png_read_image(png_ptr,rows);
|
||
|
|
|
||
|
|
//we now have the information in row format, it needs to be converted to a single array
|
||
|
|
//of 32bit pixel values specified as a uchar* so that we can create the image object
|
||
|
|
uchar* data = new uchar[info_ptr->width*info_ptr->height*4];
|
||
|
|
convertToUChar(info_ptr,rows,data);
|
||
|
|
|
||
|
|
//create the BitmpPNG that we are going to return
|
||
|
|
BitmapPNG* returnVal = new BitmapPNG(info_ptr->width,info_ptr->height,data);
|
||
|
|
|
||
|
|
//read the information after the image for completeness
|
||
|
|
png_read_end(png_ptr,NULL);
|
||
|
|
|
||
|
|
//free up png structures and other memory we've used
|
||
|
|
delete[] data;
|
||
|
|
png_destroy_read_struct(&png_ptr,&info_ptr,(png_infopp)NULL);
|
||
|
|
|
||
|
|
return returnVal;
|
||
|
|
}
|
||
|
|
|
||
|
|
//implementation of alternate read function
|
||
|
|
void png_read_vgui_stream(png_structp png_ptr, png_bytep data, png_size_t length)
|
||
|
|
{
|
||
|
|
vgui::InputStream* stream = static_cast<vgui::InputStream*>(png_get_io_ptr(png_ptr));
|
||
|
|
bool success = true;
|
||
|
|
stream->readUChar(data,(int)length,success);
|
||
|
|
}
|
||
|
|
|
||
|
|
//implementation of conversion function
|
||
|
|
void convertToUChar(png_infop png_info, png_bytepp rows, uchar* data)
|
||
|
|
{
|
||
|
|
int offset = 0;
|
||
|
|
int offset_amnt = png_info->width*4;
|
||
|
|
for(size_t counter = 0; counter < png_info->height; ++counter)
|
||
|
|
{
|
||
|
|
memcpy(&data[offset],rows[counter],offset_amnt);
|
||
|
|
offset += offset_amnt;
|
||
|
|
}
|
||
|
|
}
|