/src/FreeImage/Source/FreeImage/Conversion4.cpp
https://bitbucket.org/cabalistic/ogredeps/ · C++ · 246 lines · 165 code · 46 blank · 35 comment · 46 complexity · fbcde04e0d0c46d153d69054f536edc3 MD5 · raw file
- // ==========================================================
- // 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 "FreeImage.h"
- #include "Utilities.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);
- }