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-rw-r--r--nGenEx/PngImage.cpp279
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diff --git a/nGenEx/PngImage.cpp b/nGenEx/PngImage.cpp
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--- a/nGenEx/PngImage.cpp
+++ /dev/null
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-/* Starshatter OpenSource Distribution
- Copyright (c) 1997-2004, Destroyer Studios LLC.
- All Rights Reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions are met:
-
- * Redistributions of source code must retain the above copyright notice,
- this list of conditions and the following disclaimer.
- * Redistributions in binary form must reproduce the above copyright notice,
- this list of conditions and the following disclaimer in the documentation
- and/or other materials provided with the distribution.
- * Neither the name "Destroyer Studios" nor the names of its contributors
- may be used to endorse or promote products derived from this software
- without specific prior written permission.
-
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- POSSIBILITY OF SUCH DAMAGE.
-
- SUBSYSTEM: nGenEx.lib
- FILE: PngImage.cpp
- AUTHOR: John DiCamillo
-
-
- OVERVIEW
- ========
- BMP image file loader
-*/
-
-
-#include "MemDebug.h"
-#include "PngImage.h"
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-// Needed for compatibility with libpng 1.4++
-#define png_infopp_NULL (png_infopp)NULL
-#define png_voidp_NULL (png_voidp)NULL
-#define int_p_NULL (int*)NULL
-
-#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;
-
- fopen_s(&f, 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(png_ptr, 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(png_ptr, info_ptr);
-
- png_destroy_read_struct(&png_ptr, &info_ptr, png_infopp_NULL);
-
- return status;
-}
-
-// +--------------------------------------------------------------------+
-
-int
-PngImage::CreateImage(png_structp png_ptr, png_infop info_ptr)
-{
- int status = PNG_INVALID;
-
- width = png_get_image_width(png_ptr, info_ptr);
- height = png_get_image_height(png_ptr, info_ptr);
- bpp = png_get_bit_depth(png_ptr, info_ptr);
-
- if (width > 0 && width < 32768 && height > 0 && height < 32768) {
- // true-color:
- if (bpp >= 24) {
- status = PNG_OK;
-
- if ( png_get_channels(png_ptr, info_ptr) == 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 ( png_get_channels(png_ptr, info_ptr) == 4)
- alpha = *p++;
-
- image[row*width+col] = (alpha << 24) | (red << 16) | (green << 8) | blue;
- }
- }
- }
-
- // paletted:
- else if (bpp == 8) {
- DWORD pal[256];
-
- png_bytep trans_alpha; int num_trans; png_color_16p trans_color;
- png_colorp palette;
- int num_palette;
-
- png_get_tRNS(png_ptr, info_ptr, &trans_alpha, &num_trans, &trans_color);
- png_get_PLTE(png_ptr, info_ptr, &palette, &num_palette);
-
- if (num_trans > 0)
- alpha_loaded = true;
-
- for (int i = 0; i < 256; i++) {
- if (i < num_palette) {
- DWORD red = palette[i].red;
- DWORD green = palette[i].green;
- DWORD blue = palette[i].blue;
- DWORD alpha = 0xff;
-
- if (i < num_trans)
- alpha = trans_alpha[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
generated by cgit v1.1 at 2024-07-16 10:42:39 +0000