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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 2024-06-28 15:19:18 +0000