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gdiplus: Use integer math to apply color matrices.

This commit is contained in:
Vincent Povirk 2014-09-17 16:17:11 -05:00 committed by Alexandre Julliard
parent 76a96b70f7
commit 57f1d4489f
1 changed files with 55 additions and 25 deletions
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80
dlls/gdiplus/graphics.c
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@ -593,30 +593,47 @@ static ARGB blend_line_gradient(GpLineGradient* brush, REAL position)
}
}
static ARGB transform_color(ARGB color, const ColorMatrix *matrix)
static BOOL round_color_matrix(const ColorMatrix *matrix, int values[5][5])
{
REAL val[5], res[4];
/* Convert floating point color matrix to int[5][5], return TRUE if it's an identity */
BOOL identity = TRUE;
int i, j;
for (i=0; i<4; i++)
for (j=0; j<5; j++)
{
if (matrix->m[j][i] != (i == j ? 1.0 : 0.0))
identity = FALSE;
values[j][i] = gdip_round(matrix->m[j][i] * 256.0);
}
return identity;
}
static ARGB transform_color(ARGB color, int matrix[5][5])
{
int val[5], res[4];
int i, j;
unsigned char a, r, g, b;
val[0] = ((color >> 16) & 0xff) / 255.0; /* red */
val[1] = ((color >> 8) & 0xff) / 255.0; /* green */
val[2] = (color & 0xff) / 255.0; /* blue */
val[3] = ((color >> 24) & 0xff) / 255.0; /* alpha */
val[4] = 1.0; /* translation */
val[0] = ((color >> 16) & 0xff); /* red */
val[1] = ((color >> 8) & 0xff); /* green */
val[2] = (color & 0xff); /* blue */
val[3] = ((color >> 24) & 0xff); /* alpha */
val[4] = 255; /* translation */
for (i=0; i<4; i++)
{
res[i] = 0.0;
res[i] = 0;
for (j=0; j<5; j++)
res[i] += matrix->m[j][i] * val[j];
res[i] += matrix[j][i] * val[j];
}
a = min(max(floorf(res[3]*255.0), 0.0), 255.0);
r = min(max(floorf(res[0]*255.0), 0.0), 255.0);
g = min(max(floorf(res[1]*255.0), 0.0), 255.0);
b = min(max(floorf(res[2]*255.0), 0.0), 255.0);
a = min(max(res[3] / 256, 0), 255);
r = min(max(res[0] / 256, 0), 255);
g = min(max(res[1] / 256, 0), 255);
b = min(max(res[2] / 256, 0), 255);
return (a << 24) | (r << 16) | (g << 8) | b;
}
@ -703,28 +720,41 @@ static void apply_image_attributes(const GpImageAttributes *attributes, LPBYTE d
attributes->colormatrices[ColorAdjustTypeDefault].enabled)
{
const struct color_matrix *colormatrices;
int color_matrix[5][5];
int gray_matrix[5][5];
BOOL identity;
if (attributes->colormatrices[type].enabled)
colormatrices = &attributes->colormatrices[type];
else
colormatrices = &attributes->colormatrices[ColorAdjustTypeDefault];
for (x=0; x<width; x++)
for (y=0; y<height; y++)
{
ARGB *src_color;
src_color = (ARGB*)(data + stride * y + sizeof(ARGB) * x);
identity = round_color_matrix(&colormatrices->colormatrix, color_matrix);
if (colormatrices->flags == ColorMatrixFlagsDefault ||
!color_is_gray(*src_color))
if (colormatrices->flags == ColorMatrixFlagsAltGray)
identity = (round_color_matrix(&colormatrices->graymatrix, gray_matrix) && identity);
if (!identity)
{
for (x=0; x<width; x++)
{
for (y=0; y<height; y++)
{
*src_color = transform_color(*src_color, &colormatrices->colormatrix);
}
else if (colormatrices->flags == ColorMatrixFlagsAltGray)
{
*src_color = transform_color(*src_color, &colormatrices->graymatrix);
ARGB *src_color;
src_color = (ARGB*)(data + stride * y + sizeof(ARGB) * x);
if (colormatrices->flags == ColorMatrixFlagsDefault ||
!color_is_gray(*src_color))
{
*src_color = transform_color(*src_color, color_matrix);
}
else if (colormatrices->flags == ColorMatrixFlagsAltGray)
{
*src_color = transform_color(*src_color, gray_matrix);
}
}
}
}
}
if (attributes->gamma_enabled[type] ||