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Diffstat (limited to 'libs/freeimage/src/FreeImage/Conversion4.cpp')
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diff --git a/libs/freeimage/src/FreeImage/Conversion4.cpp b/libs/freeimage/src/FreeImage/Conversion4.cpp
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+// ==========================================================
+// Bitmap conversion routines
+//
+// Design and implementation by
+// - Riley McNiff (rmcniff@marexgroup.com)
+//
+// 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"
+
+// ----------------------------------------------------------
+// internal conversions X to 4 bits
+// ----------------------------------------------------------
+
+void DLL_CALLCONV
+FreeImage_ConvertLine1To4(BYTE *target, BYTE *source, int width_in_pixels) {
+ BOOL hinibble = TRUE;
+ for (int cols = 0; cols < width_in_pixels; cols++){
+ if (hinibble == TRUE){
+ target[cols >> 1] = ((source[cols >> 3] & (0x80 >> (cols & 0x07))) != 0 ? 15 : 0) << 4;
+ }
+ else {
+ target[cols >> 1] |= ((source[cols >> 3] & (0x80 >> (cols & 0x07))) != 0 ? 15 : 0);
+ }
+
+ hinibble = !hinibble;
+ }
+}
+
+void DLL_CALLCONV
+FreeImage_ConvertLine8To4(BYTE *target, BYTE *source, int width_in_pixels, RGBQUAD *palette) {
+ BOOL hinibble = TRUE;
+ BYTE index;
+
+ for (int cols = 0; cols < width_in_pixels; cols++){
+ index = GREY(palette[source[cols]].rgbRed, palette[source[cols]].rgbGreen, palette[source[cols]].rgbBlue);
+ if (hinibble) {
+ target[cols >> 1] = (index & 0xF0);
+ } else {
+ target[cols >> 1] |= (index >> 4);
+ }
+
+ hinibble = !hinibble;
+ }
+}
+
+void DLL_CALLCONV
+FreeImage_ConvertLine16To4_555(BYTE *target, BYTE *source, int width_in_pixels) {
+ WORD *bits = (WORD *)source;
+ BOOL hinibble = TRUE;
+
+ for (int cols = 0; cols < width_in_pixels; cols++) {
+ if (hinibble) {
+ target[cols >> 1] = GREY((((bits[cols] & FI16_555_RED_MASK) >> FI16_555_RED_SHIFT) * 0xFF) / 0x1F,
+ (((bits[cols] & FI16_555_GREEN_MASK) >> FI16_555_GREEN_SHIFT) * 0xFF) / 0x1F,
+ (((bits[cols] & FI16_555_BLUE_MASK) >> FI16_555_BLUE_SHIFT) * 0xFF) / 0x1F)
+ & 0xF0;
+ } else {
+ target[cols >> 1] |= GREY((((bits[cols] & FI16_555_RED_MASK) >> FI16_555_RED_SHIFT) * 0xFF) / 0x1F,
+ (((bits[cols] & FI16_555_GREEN_MASK) >> FI16_555_GREEN_SHIFT) * 0xFF) / 0x1F,
+ (((bits[cols] & FI16_555_BLUE_MASK) >> FI16_555_BLUE_SHIFT) * 0xFF) / 0x1F)
+ >> 4;
+ }
+
+ hinibble = !hinibble;
+ }
+}
+
+void DLL_CALLCONV
+FreeImage_ConvertLine16To4_565(BYTE *target, BYTE *source, int width_in_pixels) {
+ WORD *bits = (WORD *)source;
+ BOOL hinibble = TRUE;
+
+ for (int cols = 0; cols < width_in_pixels; cols++) {
+ if (hinibble) {
+ target[cols >> 1] = GREY((((bits[cols] & FI16_565_RED_MASK) >> FI16_565_RED_SHIFT) * 0xFF) / 0x1F,
+ (((bits[cols] & FI16_565_GREEN_MASK) >> FI16_565_GREEN_SHIFT) * 0xFF) / 0x3F,
+ (((bits[cols] & FI16_565_BLUE_MASK) >> FI16_565_BLUE_SHIFT) * 0xFF) / 0x1F)
+ & 0xF0;
+ } else {
+ target[cols >> 1] |= GREY((((bits[cols] & FI16_565_RED_MASK) >> FI16_565_RED_SHIFT) * 0xFF) / 0x1F,
+ (((bits[cols] & FI16_565_GREEN_MASK) >> FI16_565_GREEN_SHIFT) * 0xFF) / 0x3F,
+ (((bits[cols] & FI16_565_BLUE_MASK) >> FI16_565_BLUE_SHIFT) * 0xFF) / 0x1F)
+ >> 4;
+ }
+
+ hinibble = !hinibble;
+ }
+}
+
+void DLL_CALLCONV
+FreeImage_ConvertLine24To4(BYTE *target, BYTE *source, int width_in_pixels) {
+ BOOL hinibble = TRUE;
+
+ for (int cols = 0; cols < width_in_pixels; cols++) {
+ if (hinibble) {
+ target[cols >> 1] = GREY(source[FI_RGBA_RED], source[FI_RGBA_GREEN], source[FI_RGBA_BLUE]) & 0xF0;
+ } else {
+ target[cols >> 1] |= GREY(source[FI_RGBA_RED], source[FI_RGBA_GREEN], source[FI_RGBA_BLUE]) >> 4;
+ }
+
+ source += 3;
+ hinibble = !hinibble;
+ }
+}
+
+void DLL_CALLCONV
+FreeImage_ConvertLine32To4(BYTE *target, BYTE *source, int width_in_pixels) {
+ BOOL hinibble = TRUE;
+
+ for (int cols = 0; cols < width_in_pixels; cols++) {
+ if (hinibble) {
+ target[cols >> 1] = GREY(source[FI_RGBA_RED], source[FI_RGBA_GREEN], source[FI_RGBA_BLUE]) & 0xF0;
+ } else {
+ target[cols >> 1] |= GREY(source[FI_RGBA_RED], source[FI_RGBA_GREEN], source[FI_RGBA_BLUE]) >> 4;
+ }
+
+ source += 4;
+ hinibble = !hinibble;
+ }
+}
+
+// ----------------------------------------------------------
+// smart convert X to 4 bits
+// ----------------------------------------------------------
+
+FIBITMAP * DLL_CALLCONV
+FreeImage_ConvertTo4Bits(FIBITMAP *dib) {
+ if(!FreeImage_HasPixels(dib)) return NULL;
+
+ const int bpp = FreeImage_GetBPP(dib);
+
+ if(bpp != 4) {
+ const int width = FreeImage_GetWidth(dib);
+ const int height = FreeImage_GetHeight(dib);
+ FIBITMAP *new_dib = FreeImage_Allocate(width, height, 4);
+
+ if(new_dib == NULL) {
+ return NULL;
+ }
+
+ // copy metadata from src to dst
+ FreeImage_CloneMetadata(new_dib, dib);
+
+ // Build a greyscale palette (*always* needed for image processing)
+
+ RGBQUAD *new_pal = FreeImage_GetPalette(new_dib);
+
+ for(int i = 0; i < 16; i++) {
+ new_pal[i].rgbRed = (BYTE)((i << 4) + i);
+ new_pal[i].rgbGreen = (BYTE)((i << 4) + i);
+ new_pal[i].rgbBlue = (BYTE)((i << 4) + i);
+ }
+
+ switch(bpp) {
+ case 1:
+ {
+ if(FreeImage_GetColorType(dib) == FIC_PALETTE) {
+
+ // Copy the palette
+
+ RGBQUAD *old_pal = FreeImage_GetPalette(dib);
+ memcpy(&new_pal[0], &old_pal[0], sizeof(RGBQUAD));
+ memcpy(&new_pal[15], &old_pal[1], sizeof(RGBQUAD));
+
+ }
+ else if(FreeImage_GetColorType(dib) == FIC_MINISWHITE) {
+
+ // Reverse the grayscale palette
+
+ for(int i = 0; i < 16; i++) {
+ new_pal[i].rgbRed = new_pal[i].rgbGreen = new_pal[i].rgbBlue = (BYTE)(255 - ((i << 4) + i));
+ }
+ }
+
+ // Expand and copy the bitmap data
+
+ for (int rows = 0; rows < height; rows++) {
+ FreeImage_ConvertLine1To4(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width);
+ }
+ return new_dib;
+ }
+
+ case 8 :
+ {
+ // Expand and copy the bitmap data
+
+ for (int rows = 0; rows < height; rows++) {
+ FreeImage_ConvertLine8To4(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width, FreeImage_GetPalette(dib));
+ }
+ return new_dib;
+ }
+
+ case 16 :
+ {
+ // Expand and copy the bitmap data
+
+ for (int rows = 0; rows < height; rows++) {
+ if ((FreeImage_GetRedMask(dib) == FI16_565_RED_MASK) && (FreeImage_GetGreenMask(dib) == FI16_565_GREEN_MASK) && (FreeImage_GetBlueMask(dib) == FI16_565_BLUE_MASK)) {
+ FreeImage_ConvertLine16To4_565(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width);
+ } else {
+ FreeImage_ConvertLine16To4_555(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width);
+ }
+ }
+
+ return new_dib;
+ }
+
+ case 24 :
+ {
+ // Expand and copy the bitmap data
+
+ for (int rows = 0; rows < height; rows++) {
+ FreeImage_ConvertLine24To4(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width);
+ }
+ return new_dib;
+ }
+
+ case 32 :
+ {
+ // Expand and copy the bitmap data
+
+ for (int rows = 0; rows < height; rows++) {
+ FreeImage_ConvertLine32To4(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width);
+ }
+ return new_dib;
+ }
+ }
+ }
+
+ return FreeImage_Clone(dib);
+}
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