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-rw-r--r--libs/freeimage/src/FreeImage/ConversionRGBAF.cpp249
1 files changed, 249 insertions, 0 deletions
diff --git a/libs/freeimage/src/FreeImage/ConversionRGBAF.cpp b/libs/freeimage/src/FreeImage/ConversionRGBAF.cpp
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+++ b/libs/freeimage/src/FreeImage/ConversionRGBAF.cpp
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+// ==========================================================
+// Bitmap conversion routines
+//
+// Design and implementation by
+// - Tanner Helland (tannerhelland@users.sf.net)
+// - Hervé Drolon (drolon@infonie.fr)
+//
+// This file is part of FreeImage 3
+//
+// COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY
+// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES
+// THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE
+// OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED
+// CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT
+// THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY
+// SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL
+// PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER
+// THIS DISCLAIMER.
+//
+// Use at your own risk!
+// ==========================================================
+
+#include "../stdafx.h"
+
+// ----------------------------------------------------------
+// smart convert X to RGBAF
+// ----------------------------------------------------------
+
+FIBITMAP * DLL_CALLCONV
+FreeImage_ConvertToRGBAF(FIBITMAP *dib) {
+ FIBITMAP *src = NULL;
+ FIBITMAP *dst = NULL;
+
+ if(!FreeImage_HasPixels(dib)) return NULL;
+
+ const FREE_IMAGE_TYPE src_type = FreeImage_GetImageType(dib);
+
+ // check for allowed conversions
+ switch(src_type) {
+ case FIT_BITMAP:
+ {
+ // allow conversion from 32-bit
+ const FREE_IMAGE_COLOR_TYPE color_type = FreeImage_GetColorType(dib);
+ if(color_type != FIC_RGBALPHA) {
+ src = FreeImage_ConvertTo32Bits(dib);
+ if(!src) return NULL;
+ } else {
+ src = dib;
+ }
+ break;
+ }
+ case FIT_UINT16:
+ // allow conversion from 16-bit
+ src = dib;
+ break;
+ case FIT_RGB16:
+ // allow conversion from 48-bit RGB
+ src = dib;
+ break;
+ case FIT_RGBA16:
+ // allow conversion from 64-bit RGBA
+ src = dib;
+ break;
+ case FIT_FLOAT:
+ // allow conversion from 32-bit float
+ src = dib;
+ break;
+ case FIT_RGBF:
+ // allow conversion from 96-bit RGBF
+ src = dib;
+ break;
+ case FIT_RGBAF:
+ // RGBAF type : clone the src
+ return FreeImage_Clone(dib);
+ break;
+ default:
+ return NULL;
+ }
+
+ // allocate dst image
+
+ const unsigned width = FreeImage_GetWidth(src);
+ const unsigned height = FreeImage_GetHeight(src);
+
+ dst = FreeImage_AllocateT(FIT_RGBAF, width, height);
+ if(!dst) {
+ if(src != dib) {
+ FreeImage_Unload(src);
+ }
+ return NULL;
+ }
+
+ // copy metadata from src to dst
+ FreeImage_CloneMetadata(dst, src);
+
+ // convert from src type to RGBAF
+
+ const unsigned src_pitch = FreeImage_GetPitch(src);
+ const unsigned dst_pitch = FreeImage_GetPitch(dst);
+
+ switch(src_type) {
+ case FIT_BITMAP:
+ {
+ // calculate the number of bytes per pixel (4 for 32-bit)
+ const unsigned bytespp = FreeImage_GetLine(src) / FreeImage_GetWidth(src);
+
+ const BYTE *src_bits = (BYTE*)FreeImage_GetBits(src);
+ BYTE *dst_bits = (BYTE*)FreeImage_GetBits(dst);
+
+ for(unsigned y = 0; y < height; y++) {
+ const BYTE *src_pixel = (BYTE*)src_bits;
+ FIRGBAF *dst_pixel = (FIRGBAF*)dst_bits;
+ for(unsigned x = 0; x < width; x++) {
+ // convert and scale to the range [0..1]
+ dst_pixel->red = (float)(src_pixel[FI_RGBA_RED]) / 255.0F;
+ dst_pixel->green = (float)(src_pixel[FI_RGBA_GREEN]) / 255.0F;
+ dst_pixel->blue = (float)(src_pixel[FI_RGBA_BLUE]) / 255.0F;
+ dst_pixel->alpha = (float)(src_pixel[FI_RGBA_ALPHA]) / 255.0F;
+
+ src_pixel += bytespp;
+ dst_pixel++;
+ }
+ src_bits += src_pitch;
+ dst_bits += dst_pitch;
+ }
+ }
+ break;
+
+ case FIT_UINT16:
+ {
+ const BYTE *src_bits = (BYTE*)FreeImage_GetBits(src);
+ BYTE *dst_bits = (BYTE*)FreeImage_GetBits(dst);
+
+ for(unsigned y = 0; y < height; y++) {
+ const WORD *src_pixel = (WORD*)src_bits;
+ FIRGBAF *dst_pixel = (FIRGBAF*)dst_bits;
+
+ for(unsigned x = 0; x < width; x++) {
+ // convert and scale to the range [0..1]
+ const float dst_value = (float)src_pixel[x] / 65535.0F;
+ dst_pixel[x].red = dst_value;
+ dst_pixel[x].green = dst_value;
+ dst_pixel[x].blue = dst_value;
+ dst_pixel[x].alpha = 1.0F;
+ }
+ src_bits += src_pitch;
+ dst_bits += dst_pitch;
+ }
+ }
+ break;
+
+ case FIT_RGB16:
+ {
+ const BYTE *src_bits = (BYTE*)FreeImage_GetBits(src);
+ BYTE *dst_bits = (BYTE*)FreeImage_GetBits(dst);
+
+ for(unsigned y = 0; y < height; y++) {
+ const FIRGB16 *src_pixel = (FIRGB16*)src_bits;
+ FIRGBAF *dst_pixel = (FIRGBAF*)dst_bits;
+
+ for(unsigned x = 0; x < width; x++) {
+ // convert and scale to the range [0..1]
+ dst_pixel[x].red = (float)(src_pixel[x].red) / 65535.0F;
+ dst_pixel[x].green = (float)(src_pixel[x].green) / 65535.0F;
+ dst_pixel[x].blue = (float)(src_pixel[x].blue) / 65535.0F;
+ dst_pixel[x].alpha = 1.0F;
+ }
+ src_bits += src_pitch;
+ dst_bits += dst_pitch;
+ }
+ }
+ break;
+
+ case FIT_RGBA16:
+ {
+ const BYTE *src_bits = (BYTE*)FreeImage_GetBits(src);
+ BYTE *dst_bits = (BYTE*)FreeImage_GetBits(dst);
+
+ for(unsigned y = 0; y < height; y++) {
+ const FIRGBA16 *src_pixel = (FIRGBA16*)src_bits;
+ FIRGBAF *dst_pixel = (FIRGBAF*)dst_bits;
+
+ for(unsigned x = 0; x < width; x++) {
+ // convert and scale to the range [0..1]
+ dst_pixel[x].red = (float)(src_pixel[x].red) / 65535.0F;
+ dst_pixel[x].green = (float)(src_pixel[x].green) / 65535.0F;
+ dst_pixel[x].blue = (float)(src_pixel[x].blue) / 65535.0F;
+ dst_pixel[x].alpha = (float)(src_pixel[x].alpha) / 65535.0F;
+ }
+ src_bits += src_pitch;
+ dst_bits += dst_pitch;
+ }
+ }
+ break;
+
+ case FIT_FLOAT:
+ {
+ const BYTE *src_bits = (BYTE*)FreeImage_GetBits(src);
+ BYTE *dst_bits = (BYTE*)FreeImage_GetBits(dst);
+
+ for(unsigned y = 0; y < height; y++) {
+ const float *src_pixel = (float*)src_bits;
+ FIRGBAF *dst_pixel = (FIRGBAF*)dst_bits;
+
+ for(unsigned x = 0; x < width; x++) {
+ // convert by copying greyscale channel to each R, G, B channels
+ // assume float values are in [0..1]
+ const float value = CLAMP(src_pixel[x], 0.0F, 1.0F);
+ dst_pixel[x].red = value;
+ dst_pixel[x].green = value;
+ dst_pixel[x].blue = value;
+ dst_pixel[x].alpha = 1.0F;
+ }
+ src_bits += src_pitch;
+ dst_bits += dst_pitch;
+ }
+ }
+ break;
+
+ case FIT_RGBF:
+ {
+ const BYTE *src_bits = (BYTE*)FreeImage_GetBits(src);
+ BYTE *dst_bits = (BYTE*)FreeImage_GetBits(dst);
+
+ for(unsigned y = 0; y < height; y++) {
+ const FIRGBF *src_pixel = (FIRGBF*)src_bits;
+ FIRGBAF *dst_pixel = (FIRGBAF*)dst_bits;
+
+ for(unsigned x = 0; x < width; x++) {
+ // convert pixels directly, while adding a "dummy" alpha of 1.0
+ dst_pixel[x].red = CLAMP(src_pixel[x].red, 0.0F, 1.0F);
+ dst_pixel[x].green = CLAMP(src_pixel[x].green, 0.0F, 1.0F);
+ dst_pixel[x].blue = CLAMP(src_pixel[x].blue, 0.0F, 1.0F);
+ dst_pixel[x].alpha = 1.0F;
+ }
+ src_bits += src_pitch;
+ dst_bits += dst_pitch;
+ }
+ }
+ break;
+ }
+
+ if(src != dib) {
+ FreeImage_Unload(src);
+ }
+
+ return dst;
+}
+
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