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