/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is mozilla.org code. * * The Initial Developer of the Original Code is * Netscape Communications Corporation. * Portions created by the Initial Developer are Copyright (C) 1998 * the Initial Developer. All Rights Reserved. * * Contributor(s): * * Alternatively, the contents of this file may be used under the terms of * either of the GNU General Public License Version 2 or later (the "GPL"), * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ #include "plstr.h" #include "nsColor.h" #include "nsColorNames.h" #include "nsString.h" #include "nscore.h" #include "nsCoord.h" #include "nsUnitConversion.h" #include "nsCOMPtr.h" #include "nsIServiceManager.h" #include "nsIScreen.h" #include "nsIScreenManager.h" #include #include "prprf.h" static int ComponentValue(const char* aColorSpec, int aLen, int color, int dpc) { int component = 0; int index = (color * dpc); if (2 < dpc) { dpc = 2; } while (--dpc >= 0) { char ch = ((index < aLen) ? aColorSpec[index++] : '0'); if (('0' <= ch) && (ch <= '9')) { component = (component * 16) + (ch - '0'); } else if ((('a' <= ch) && (ch <= 'f')) || (('A' <= ch) && (ch <= 'F'))) { // "ch&7" handles lower and uppercase hex alphabetics component = (component * 16) + (ch & 7) + 9; } else { // not a hex digit, treat it like 0 component = (component * 16); } } return component; } extern "C" NS_GFX_(PRBool) NS_HexToRGB(const nsString& aColorSpec, nscolor* aResult) { // XXXldb nsStackString<10> NS_LossyConvertUCS2toASCII bufferStr(aColorSpec); return NS_ASCIIHexToRGB(bufferStr, aResult); } extern "C" NS_GFX_(PRBool) NS_ASCIIHexToRGB(const nsCString& aColorSpec, nscolor* aResult) { const char* buffer = aColorSpec.get(); int nameLen = aColorSpec.Length(); if ((nameLen == 3) || (nameLen == 6)) { // Make sure the digits are legal for (int i = 0; i < nameLen; i++) { char ch = buffer[i]; if (((ch >= '0') && (ch <= '9')) || ((ch >= 'a') && (ch <= 'f')) || ((ch >= 'A') && (ch <= 'F'))) { // Legal character continue; } // Whoops. Illegal character. return PR_FALSE; } // Convert the ascii to binary int dpc = ((3 == nameLen) ? 1 : 2); // Translate components from hex to binary int r = ComponentValue(buffer, nameLen, 0, dpc); int g = ComponentValue(buffer, nameLen, 1, dpc); int b = ComponentValue(buffer, nameLen, 2, dpc); if (dpc == 1) { // Scale single digit component to an 8 bit value. Replicate the // single digit to compute the new value. r = (r << 4) | r; g = (g << 4) | g; b = (b << 4) | b; } NS_ASSERTION((r >= 0) && (r <= 255), "bad r"); NS_ASSERTION((g >= 0) && (g <= 255), "bad g"); NS_ASSERTION((b >= 0) && (b <= 255), "bad b"); if (nsnull != aResult) { *aResult = NS_RGB(r, g, b); } return PR_TRUE; } // Improperly formatted color value return PR_FALSE; } // compatible with legacy Nav behavior extern "C" NS_GFX_(PRBool) NS_LooseHexToRGB(const nsString& aColorSpec, nscolor* aResult) { // XXXldb nsStackString<30> NS_LossyConvertUCS2toASCII buffer(aColorSpec); int nameLen = buffer.Length(); const char* colorSpec = buffer.get(); if ('#' == colorSpec[0]) { ++colorSpec; --nameLen; } if (3 < nameLen) { // Convert the ascii to binary int dpc = (nameLen / 3) + (((nameLen % 3) != 0) ? 1 : 0); if (4 < dpc) { dpc = 4; } // Translate components from hex to binary int r = ComponentValue(colorSpec, nameLen, 0, dpc); int g = ComponentValue(colorSpec, nameLen, 1, dpc); int b = ComponentValue(colorSpec, nameLen, 2, dpc); NS_ASSERTION((r >= 0) && (r <= 255), "bad r"); NS_ASSERTION((g >= 0) && (g <= 255), "bad g"); NS_ASSERTION((b >= 0) && (b <= 255), "bad b"); if (nsnull != aResult) { *aResult = NS_RGB(r, g, b); } } else { if (nsnull != aResult) { *aResult = NS_RGB(0, 0, 0); } } return PR_TRUE; } extern "C" NS_GFX_(void) NS_RGBToHex(nscolor aColor, nsAString& aResult) { char buf[10]; PR_snprintf(buf, sizeof(buf), "#%02x%02x%02x", NS_GET_R(aColor), NS_GET_G(aColor), NS_GET_B(aColor)); CopyASCIItoUTF16(buf, aResult); } extern "C" NS_GFX_(void) NS_RGBToASCIIHex(nscolor aColor, nsAFlatCString& aResult) { aResult.SetLength(7); char *buf = aResult.BeginWriting(); PR_snprintf(buf, 8, "#%02x%02x%02x", NS_GET_R(aColor), NS_GET_G(aColor), NS_GET_B(aColor)); } extern "C" NS_GFX_(PRBool) NS_ColorNameToRGB(const nsAString& aColorName, nscolor* aResult) { nsColorName id = nsColorNames::LookupName(aColorName); if (eColorName_UNKNOWN < id) { NS_ASSERTION(id < eColorName_COUNT, "LookupName mess up"); if (nsnull != aResult) { *aResult = nsColorNames::kColors[id]; } return PR_TRUE; } return PR_FALSE; } extern "C" NS_GFX_(nscolor) NS_BrightenColor(nscolor inColor) { PRIntn r, g, b, max, over; r = NS_GET_R(inColor); g = NS_GET_G(inColor); b = NS_GET_B(inColor); //10% of max color increase across the board r += 25; g += 25; b += 25; //figure out which color is largest if (r > g) { if (b > r) max = b; else max = r; } else { if (b > g) max = b; else max = g; } //if we overflowed on this max color, increase //other components by the overflow amount if (max > 255) { over = max - 255; if (max == r) { g += over; b += over; } else if (max == g) { r += over; b += over; } else { r += over; g += over; } } //clamp if (r > 255) r = 255; if (g > 255) g = 255; if (b > 255) b = 255; return NS_RGBA(r, g, b, NS_GET_A(inColor)); } extern "C" NS_GFX_(nscolor) NS_DarkenColor(nscolor inColor) { PRIntn r, g, b, max; r = NS_GET_R(inColor); g = NS_GET_G(inColor); b = NS_GET_B(inColor); //10% of max color decrease across the board r -= 25; g -= 25; b -= 25; //figure out which color is largest if (r > g) { if (b > r) max = b; else max = r; } else { if (b > g) max = b; else max = g; } //if we underflowed on this max color, decrease //other components by the underflow amount if (max < 0) { if (max == r) { g += max; b += max; } else if (max == g) { r += max; b += max; } else { r += max; g += max; } } //clamp if (r < 0) r = 0; if (g < 0) g = 0; if (b < 0) b = 0; return NS_RGBA(r, g, b, NS_GET_A(inColor)); } extern "C" NS_GFX_(nscolor) NS_ComposeColors(nscolor aBG, nscolor aFG) { PRIntn bgAlpha = NS_GET_A(aBG); PRIntn r, g, b, a; // First compute what we get drawing aBG onto RGBA(0,0,0,0) MOZ_BLEND(r, 0, NS_GET_R(aBG), bgAlpha); MOZ_BLEND(g, 0, NS_GET_G(aBG), bgAlpha); MOZ_BLEND(b, 0, NS_GET_B(aBG), bgAlpha); a = bgAlpha; // Now draw aFG on top of that PRIntn fgAlpha = NS_GET_A(aFG); MOZ_BLEND(r, r, NS_GET_R(aFG), fgAlpha); MOZ_BLEND(g, g, NS_GET_G(aFG), fgAlpha); MOZ_BLEND(b, b, NS_GET_B(aFG), fgAlpha); MOZ_BLEND(a, a, 255, fgAlpha); return NS_RGBA(r, g, b, a); } // Functions to convert from HSL color space to RGB color space. // This is the algorithm described in the CSS3 specification // helper static float HSL_HueToRGB(float m1, float m2, float h) { if (h < 0.0f) h += 1.0f; if (h > 1.0f) h -= 1.0f; if (h < (float)(1.0/6.0)) return m1 + (m2 - m1)*h*6.0f; if (h < (float)(1.0/2.0)) return m2; if (h < (float)(2.0/3.0)) return m1 + (m2 - m1)*((float)(2.0/3.0) - h)*6.0f; return m1; } // The float parameters are all expected to be in the range 0-1 extern "C" NS_GFX_(nscolor) NS_HSL2RGB(float h, float s, float l) { PRUint8 r, g, b; float m1, m2; if (l <= 0.5f) { m2 = l*(s+1); } else { m2 = l + s - l*s; } m1 = l*2 - m2; r = PRUint8(255 * HSL_HueToRGB(m1, m2, h + 1.0f/3.0f)); g = PRUint8(255 * HSL_HueToRGB(m1, m2, h)); b = PRUint8(255 * HSL_HueToRGB(m1, m2, h - 1.0f/3.0f)); return NS_RGB(r, g, b); }