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-rw-r--r--core/include/fxcrt/fx_basic.h46
-rw-r--r--core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp87
-rw-r--r--core/src/fxcrt/fx_basic_util.cpp43
3 files changed, 134 insertions, 42 deletions
diff --git a/core/include/fxcrt/fx_basic.h b/core/include/fxcrt/fx_basic.h
index ece2b43a2e..22ba611a77 100644
--- a/core/include/fxcrt/fx_basic.h
+++ b/core/include/fxcrt/fx_basic.h
@@ -1578,4 +1578,50 @@ typedef enum {
} FX_ProgressiveStatus;
#define ProgressiveStatus FX_ProgressiveStatus
#define FX_NAMESPACE_DECLARE(namespace, type) namespace::type
+
+class CFX_Vector_3by1 : public CFX_Object
+{
+public:
+
+ CFX_Vector_3by1() :
+ a(0.0f), b(0.0f), c(0.0f)
+ {}
+
+ CFX_Vector_3by1(FX_FLOAT a1, FX_FLOAT b1, FX_FLOAT c1):
+ a(a1), b(b1), c(c1)
+ {}
+
+ FX_FLOAT a;
+ FX_FLOAT b;
+ FX_FLOAT c;
+};
+class CFX_Matrix_3by3 : public CFX_Object
+{
+public:
+
+ CFX_Matrix_3by3():
+ a(0.0f), b(0.0f), c(0.0f), d(0.0f), e(0.0f), f(0.0f), g(0.0f), h(0.0f), i(0.0f)
+ {}
+
+ CFX_Matrix_3by3(FX_FLOAT a1, FX_FLOAT b1, FX_FLOAT c1, FX_FLOAT d1, FX_FLOAT e1, FX_FLOAT f1, FX_FLOAT g1, FX_FLOAT h1, FX_FLOAT i1) :
+ a(a1), b(b1), c(c1), d(d1), e(e1), f(f1), g(g1), h(h1), i(i1)
+ {}
+
+ CFX_Matrix_3by3 Inverse();
+
+ CFX_Matrix_3by3 Multiply(const CFX_Matrix_3by3 &m);
+
+ CFX_Vector_3by1 TransformVector(const CFX_Vector_3by1 &v);
+
+ FX_FLOAT a;
+ FX_FLOAT b;
+ FX_FLOAT c;
+ FX_FLOAT d;
+ FX_FLOAT e;
+ FX_FLOAT f;
+ FX_FLOAT g;
+ FX_FLOAT h;
+ FX_FLOAT i;
+};
+
#endif
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
diff --git a/core/src/fxcrt/fx_basic_util.cpp b/core/src/fxcrt/fx_basic_util.cpp
index dc5eea7821..5a40c2b4be 100644
--- a/core/src/fxcrt/fx_basic_util.cpp
+++ b/core/src/fxcrt/fx_basic_util.cpp
@@ -442,3 +442,46 @@ FX_WCHAR FX_GetFolderSeparator()
return '/';
#endif
}
+
+CFX_Matrix_3by3 CFX_Matrix_3by3::Inverse()
+{
+ FX_FLOAT det = a*(e*i - f*h) - b*(i*d - f*g) + c*(d*h - e*g);
+ if (FXSYS_fabs(det) < 0.0000001)
+ return CFX_Matrix_3by3();
+ else
+ return CFX_Matrix_3by3(
+ (e*i - f*h) / det,
+ -(b*i - c*h) / det,
+ (b*f - c*e) / det,
+ -(d*i - f*g) / det,
+ (a*i - c*g) / det,
+ -(a*f - c*d) / det,
+ (d*h - e*g) / det,
+ -(a*h - b*g) / det,
+ (a*e - b*d) / det
+ );
+}
+
+CFX_Matrix_3by3 CFX_Matrix_3by3::Multiply(const CFX_Matrix_3by3 &m)
+{
+ return CFX_Matrix_3by3(
+ a*m.a + b*m.d + c*m.g,
+ a*m.b + b*m.e + c*m.h,
+ a*m.c + b*m.f + c*m.i,
+ d*m.a + e*m.d + f*m.g,
+ d*m.b + e*m.e + f*m.h,
+ d*m.c + e*m.f + f*m.i,
+ g*m.a + h*m.d + i*m.g,
+ g*m.b + h*m.e + i*m.h,
+ g*m.c + h*m.f + i*m.i
+ );
+}
+
+CFX_Vector_3by1 CFX_Matrix_3by3::TransformVector(const CFX_Vector_3by1 &v)
+{
+ return CFX_Vector_3by1(
+ a * v.a + b * v.b + c * v.c,
+ d * v.a + e * v.b + f * v.c,
+ g * v.a + h * v.b + i * v.c
+ );
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-16 03:24:34 +0000