diff options
Diffstat (limited to 'nGenEx/PngImage.cpp')
| -rw-r--r-- | nGenEx/PngImage.cpp | 334 |
1 files changed, 167 insertions, 167 deletions
diff --git a/nGenEx/PngImage.cpp b/nGenEx/PngImage.cpp index abfac7d..fae2e80 100644 --- a/nGenEx/PngImage.cpp +++ b/nGenEx/PngImage.cpp @@ -1,15 +1,15 @@ /* Project nGenEx
- Destroyer Studios LLC
- Copyright © 1997-2004. All Rights Reserved.
+ Destroyer Studios LLC
+ Copyright © 1997-2004. All Rights Reserved.
- SUBSYSTEM: nGenEx.lib
- FILE: PngImage.cpp
- AUTHOR: John DiCamillo
+ SUBSYSTEM: nGenEx.lib
+ FILE: PngImage.cpp
+ AUTHOR: John DiCamillo
- OVERVIEW
- ========
- BMP image file loader
+ OVERVIEW
+ ========
+ BMP image file loader
*/
@@ -30,85 +30,85 @@ // +--------------------------------------------------------------------+
PngImage::PngImage()
- : width(0), height(0), bpp(0), alpha_loaded(false), image(0)
+: width(0), height(0), bpp(0), alpha_loaded(false), image(0)
{ }
PngImage::~PngImage()
{
- delete [] image;
+ delete [] image;
}
// +--------------------------------------------------------------------+
int PngImage::Load(char *filename)
{
- int status = PNG_INVALID;
- FILE* f;
+ int status = PNG_INVALID;
+ FILE* f;
- fopen_s(&f, filename,"rb");
- if (f == NULL)
- return PNG_NOFILE;
+ fopen_s(&f, filename,"rb");
+ if (f == NULL)
+ return PNG_NOFILE;
- BYTE buf[12];
- fread(buf, 8, 1, f);
- fseek(f, 0, SEEK_SET);
+ 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;
+ if (png_sig_cmp(buf, (png_size_t)0, 8))
+ return PNG_INVALID;
- png_structp png_ptr;
- png_infop info_ptr;
+ 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);
+ /* 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;
- }
+ 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;
- }
+ /* 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);
+ 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);
+ status = CreateImage(png_ptr, info_ptr);
- png_destroy_read_struct(&png_ptr, &info_ptr, png_infopp_NULL);
+ png_destroy_read_struct(&png_ptr, &info_ptr, png_infopp_NULL);
- fclose(f);
- return status;
+ fclose(f);
+ return status;
}
// +--------------------------------------------------------------------+
struct PngIOStruct
{
- BYTE* fp;
- BYTE* buffer;
- DWORD length;
+ 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);
+ PngIOStruct* read_io_ptr = (PngIOStruct*) png_get_io_ptr(read_ptr);
- if (!read_io_ptr)
- return;
+ 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;
- }
+ 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)
@@ -121,49 +121,49 @@ static void png_user_flush_data(png_structp png_ptr) int PngImage::LoadBuffer(unsigned char* buf, int len)
{
- int status = PNG_INVALID;
- PngIOStruct io;
+ int status = PNG_INVALID;
+ PngIOStruct io;
- if (buf == NULL)
- return PNG_NOFILE;
+ if (buf == NULL)
+ return PNG_NOFILE;
- if (png_sig_cmp(buf, (png_size_t)0, 8))
- return PNG_INVALID;
+ if (png_sig_cmp(buf, (png_size_t)0, 8))
+ return PNG_INVALID;
- io.buffer = buf;
- io.fp = buf;
- io.length = len;
+ io.buffer = buf;
+ io.fp = buf;
+ io.length = len;
- png_structp png_ptr;
- png_infop info_ptr;
+ 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);
+ /* 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;
- }
+ 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;
- }
+ /* 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);
+ 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);
+ status = CreateImage(png_ptr, info_ptr);
- png_destroy_read_struct(&png_ptr, &info_ptr, png_infopp_NULL);
+ png_destroy_read_struct(&png_ptr, &info_ptr, png_infopp_NULL);
- return status;
+ return status;
}
// +--------------------------------------------------------------------+
@@ -171,85 +171,85 @@ int PngImage::LoadBuffer(unsigned char* buf, int len) 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;
+ 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 |