diff options
Diffstat (limited to 'core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp')
| -rw-r--r-- | core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp | 87 |
1 files changed, 45 insertions, 42 deletions
diff --git a/core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp b/core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp index 1cd109784d..467fb63f47 100644 --- a/core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp +++ b/core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp @@ -207,56 +207,59 @@ const FX_BYTE g_sRGBSamples2[] = { 241, 241, 242, 242, 243, 243, 244, 244, 245, 245, 246, 246, 246, 247, 247, 248, 248, 249, 249, 250, 250, 251, 251, 251, 252, 252, 253, 253, 254, 254, 255, 255, }; -static void XYZ_to_sRGB(FX_FLOAT X, FX_FLOAT Y, FX_FLOAT Z, FX_FLOAT& R, FX_FLOAT& G, FX_FLOAT& B) + +static FX_FLOAT RGB_Conversion(FX_FLOAT colorComponent) { - FX_FLOAT R1 = 3.2410f * X - 1.5374f * Y - 0.4986f * Z; - FX_FLOAT G1 = -0.9692f * X + 1.8760f * Y + 0.0416f * Z; - FX_FLOAT B1 = 0.0556f * X - 0.2040f * Y + 1.0570f * Z; - if (R1 > 1) { - R1 = 1; - } - if (R1 < 0) { - R1 = 0; - } - if (G1 > 1) { - G1 = 1; - } - if (G1 < 0) { - G1 = 0; - } - if (B1 > 1) { - B1 = 1; + if (colorComponent > 1) { + colorComponent = 1; } - if (B1 < 0) { - B1 = 0; + if (colorComponent < 0) { + colorComponent = 0; } - int scale = (int)(R1 * 1023); + int scale = (int)(colorComponent * 1023); if (scale < 0) { scale = 0; } if (scale < 192) { - R = (g_sRGBSamples1[scale] / 255.0f); - } else { - R = (g_sRGBSamples2[scale / 4 - 48] / 255.0f); - } - scale = (int)(G1 * 1023); - if (scale < 0) { - scale = 0; - } - if (scale < 192) { - G = (g_sRGBSamples1[scale] / 255.0f); - } else { - G = (g_sRGBSamples2[scale / 4 - 48] / 255.0f); - } - scale = (int)(B1 * 1023); - if (scale < 0) { - scale = 0; + colorComponent = (g_sRGBSamples1[scale] / 255.0f); } - if (scale < 192) { - B = (g_sRGBSamples1[scale] / 255.0f); - } else { - B = (g_sRGBSamples2[scale / 4 - 48] / 255.0f); + else { + colorComponent = (g_sRGBSamples2[scale / 4 - 48] / 255.0f); } + return colorComponent; +} + +static void XYZ_to_sRGB(FX_FLOAT X, FX_FLOAT Y, FX_FLOAT Z, FX_FLOAT& R, FX_FLOAT& G, FX_FLOAT& B) +{ + FX_FLOAT R1 = 3.2410f * X - 1.5374f * Y - 0.4986f * Z; + FX_FLOAT G1 = -0.9692f * X + 1.8760f * Y + 0.0416f * Z; + FX_FLOAT B1 = 0.0556f * X - 0.2040f * Y + 1.0570f * Z; + + R = RGB_Conversion(R1); + G = RGB_Conversion(G1); + B = RGB_Conversion(B1); +} + +static void XYZ_to_sRGB_WhitePoint(FX_FLOAT X, FX_FLOAT Y, FX_FLOAT Z, FX_FLOAT& R, FX_FLOAT& G, FX_FLOAT& B, FX_FLOAT Xw, FX_FLOAT Yw, FX_FLOAT Zw) +{ + // The following RGB_xyz is based on + // sRGB value {Rx,Ry}={0.64, 0.33}, {Gx,Gy}={0.30, 0.60}, {Bx,By}={0.15, 0.06} + + FX_FLOAT Rx = 0.64f, Ry = 0.33f; + FX_FLOAT Gx = 0.30f, Gy = 0.60f; + FX_FLOAT Bx = 0.15f, By = 0.06f; + CFX_Matrix_3by3 RGB_xyz(Rx, Gx, Bx, Ry, Gy, By, 1 - Rx - Ry, 1 - Gx - Gy, 1 - Bx - By); + CFX_Vector_3by1 whitePoint(Xw, Yw, Zw); + CFX_Vector_3by1 XYZ(X, Y, Z); + + CFX_Vector_3by1 RGB_Sum_XYZ = RGB_xyz.Inverse().TransformVector(whitePoint); + CFX_Matrix_3by3 RGB_SUM_XYZ_DIAG(RGB_Sum_XYZ.a, 0, 0, 0, RGB_Sum_XYZ.b, 0, 0, 0, RGB_Sum_XYZ.c); + CFX_Matrix_3by3 M = RGB_xyz.Multiply(RGB_SUM_XYZ_DIAG); + CFX_Vector_3by1 RGB = M.Inverse().TransformVector(XYZ); + + R = RGB_Conversion(RGB.a); + G = RGB_Conversion(RGB.b); + B = RGB_Conversion(RGB.c); } class CPDF_CalGray : public CPDF_ColorSpace { @@ -386,7 +389,7 @@ FX_BOOL CPDF_CalRGB::GetRGB(FX_FLOAT* pBuf, FX_FLOAT& R, FX_FLOAT& G, FX_FLOAT& Y = B_; Z = C_; } - XYZ_to_sRGB(X, Y, Z, R, G, B); + XYZ_to_sRGB_WhitePoint(X, Y, Z, R, G, B, m_WhitePoint[0], m_WhitePoint[1], m_WhitePoint[2]); return TRUE; } FX_BOOL CPDF_CalRGB::SetRGB(FX_FLOAT* pBuf, FX_FLOAT R, FX_FLOAT G, FX_FLOAT B) const |