From e33e19d0587146859d48a134ec9fd94e7b7ba5cd Mon Sep 17 00:00:00 2001 From: "FWoltermann@gmail.com" Date: Thu, 8 Dec 2011 14:53:40 +0000 Subject: Initial upload --- nGenEx/PngImage.cpp | 246 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 246 insertions(+) create mode 100644 nGenEx/PngImage.cpp (limited to 'nGenEx/PngImage.cpp') diff --git a/nGenEx/PngImage.cpp b/nGenEx/PngImage.cpp new file mode 100644 index 0000000..0fedc6e --- /dev/null +++ b/nGenEx/PngImage.cpp @@ -0,0 +1,246 @@ +/* Project nGenEx + Destroyer Studios LLC + Copyright © 1997-2004. All Rights Reserved. + + SUBSYSTEM: nGenEx.lib + FILE: PngImage.cpp + AUTHOR: John DiCamillo + + + OVERVIEW + ======== + BMP image file loader +*/ + + +#include "MemDebug.h" +#include "PngImage.h" + +#include +#include +#include + +#include "png.h" + +// +--------------------------------------------------------------------+ + +PngImage::PngImage() + : width(0), height(0), bpp(0), alpha_loaded(false), image(0) +{ } + +PngImage::~PngImage() +{ + delete [] image; +} + +// +--------------------------------------------------------------------+ + +int PngImage::Load(char *filename) +{ + int status = PNG_INVALID; + FILE* f; + + f = fopen(filename,"rb"); + if (f == NULL) + return PNG_NOFILE; + + BYTE buf[12]; + fread(buf, 8, 1, f); + fseek(f, 0, SEEK_SET); + + if (png_sig_cmp(buf, (png_size_t)0, 8)) + return PNG_INVALID; + + png_structp png_ptr; + png_infop info_ptr; + + /* Create and initialize the png_struct with the desired error handler + * functions. If you want to use the default stderr and longjump method, + * you can supply NULL for the last three parameters. We also supply the + * the compiler header file version, so that we know if the application + * was compiled with a compatible version of the library. REQUIRED + */ + png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0); + + if (!png_ptr) { + return PNG_NOMEM; + } + + /* Allocate/initialize the memory for image information. REQUIRED. */ + info_ptr = png_create_info_struct(png_ptr); + if (!info_ptr) { + png_destroy_read_struct(&png_ptr, png_infopp_NULL, png_infopp_NULL); + return PNG_NOMEM; + } + + png_init_io(png_ptr, f); + png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, png_voidp_NULL); + + status = CreateImage((void*) png_ptr, (void*) info_ptr); + + png_destroy_read_struct(&png_ptr, &info_ptr, png_infopp_NULL); + + fclose(f); + return status; +} + +// +--------------------------------------------------------------------+ + +struct PngIOStruct +{ + BYTE* fp; + BYTE* buffer; + DWORD length; +}; + +static void png_user_read_data(png_structp read_ptr, png_bytep data, png_size_t length) +{ + PngIOStruct* read_io_ptr = (PngIOStruct*) png_get_io_ptr(read_ptr); + + if (!read_io_ptr) + return; + + if (read_io_ptr->fp + length < read_io_ptr->buffer + read_io_ptr->length) { + memcpy(data, read_io_ptr->fp, length); + read_io_ptr->fp += length; + } +} + +static void png_user_write_data(png_structp png_ptr, png_bytep data, png_size_t length) +{ +} + +static void png_user_flush_data(png_structp png_ptr) +{ +} + +int PngImage::LoadBuffer(unsigned char* buf, int len) +{ + int status = PNG_INVALID; + PngIOStruct io; + + if (buf == NULL) + return PNG_NOFILE; + + if (png_sig_cmp(buf, (png_size_t)0, 8)) + return PNG_INVALID; + + io.buffer = buf; + io.fp = buf; + io.length = len; + + png_structp png_ptr; + png_infop info_ptr; + + /* Create and initialize the png_struct with the desired error handler + * functions. If you want to use the default stderr and longjump method, + * you can supply NULL for the last three parameters. We also supply the + * the compiler header file version, so that we know if the application + * was compiled with a compatible version of the library. REQUIRED + */ + png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0); + + if (!png_ptr) { + return PNG_NOMEM; + } + + /* Allocate/initialize the memory for image information. REQUIRED. */ + info_ptr = png_create_info_struct(png_ptr); + if (!info_ptr) { + png_destroy_read_struct(&png_ptr, png_infopp_NULL, png_infopp_NULL); + return PNG_NOMEM; + } + + png_set_read_fn(png_ptr, (void *) (&io), png_user_read_data); + png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, png_voidp_NULL); + + status = CreateImage((void*) png_ptr, (void*) info_ptr); + + png_destroy_read_struct(&png_ptr, &info_ptr, png_infopp_NULL); + + return status; +} + +// +--------------------------------------------------------------------+ + +int +PngImage::CreateImage(void* pptr, void* iptr) +{ + int status = PNG_INVALID; + + png_structp png_ptr = (png_structp) pptr; + png_infop info_ptr = (png_infop) iptr; + + width = info_ptr->width; + height = info_ptr->height; + bpp = info_ptr->pixel_depth; + + if (width > 0 && width < 32768 && height > 0 && height < 32768) { + // true-color: + if (bpp >= 24) { + status = PNG_OK; + + if (info_ptr->channels == 4) + alpha_loaded = true; + + image = new DWORD[width*height]; + BYTE** rows = png_get_rows(png_ptr, info_ptr); + + for (DWORD row = 0; row < height; row++) { + BYTE* p = rows[row]; + + for (DWORD col = 0; col < width; col++) { + DWORD red = *p++; + DWORD green = *p++; + DWORD blue = *p++; + DWORD alpha = 0xff; + + if (info_ptr->channels == 4) + alpha = *p++; + + image[row*width+col] = (alpha << 24) | (red << 16) | (green << 8) | blue; + } + } + } + + // paletted: + else if (bpp == 8 && info_ptr->num_palette > 0) { + DWORD pal[256]; + + if (info_ptr->num_trans > 0) + alpha_loaded = true; + + for (int i = 0; i < 256; i++) { + if (i < info_ptr->num_palette) { + DWORD red = info_ptr->palette[i].red; + DWORD green = info_ptr->palette[i].green; + DWORD blue = info_ptr->palette[i].blue; + DWORD alpha = 0xff; + + if (i < info_ptr->num_trans) + alpha = info_ptr->trans[i]; + + pal[i] = (alpha << 24) | (red << 16) | (green << 8) | blue; + } + + else { + pal[i] = 0; + } + } + + image = new DWORD[width*height]; + BYTE** rows = png_get_rows(png_ptr, info_ptr); + + for (DWORD row = 0; row < height; row++) { + BYTE* p = rows[row]; + + for (DWORD col = 0; col < width; col++) { + BYTE index = *p++; + image[row*width+col] = pal[index]; + } + } + } + } + + return status; +} \ No newline at end of file -- cgit v1.1