/*
* Apply glColorMask to an array of RGBA pixels.
*/
void gl_mask_color_pixels( GLcontext *ctx,
GLuint n, const GLint x[], const GLint y[],
GLubyte red[], GLubyte green[],
GLubyte blue[], GLubyte alpha[],
const GLubyte mask[] )
{
GLubyte r[PB_SIZE], g[PB_SIZE], b[PB_SIZE], a[PB_SIZE];
(*ctx->Driver.ReadColorPixels)( ctx, n, x, y, r, g, b, a, mask );
if (ctx->RasterMask & ALPHABUF_BIT) {
gl_read_alpha_pixels( ctx, n, x, y, a, mask );
}
if ((ctx->Color.ColorMask & 8) == 0) {
/* replace source reds with frame buffer reds */
MEMCPY( red, r, n );
}
if ((ctx->Color.ColorMask & 4) == 0) {
/* replace source greens with frame buffer greens */
MEMCPY( green, g, n );
}
if ((ctx->Color.ColorMask & 2) == 0) {
/* replace source blues with frame buffer blues */
MEMCPY( blue, b, n );
}
if ((ctx->Color.ColorMask & 1) == 0) {
/* replace source alphas with frame buffer alphas */
MEMCPY( alpha, a, n );
}
}
/*
* Apply the current logic operator to an array of RGBA pixels.
* This is only used if the device driver can't do logic ops.
*/
void gl_logicop_rgba_pixels( GLcontext *ctx,
GLuint n, const GLint x[], const GLint y[],
GLubyte rgba[][4], const GLubyte mask[] )
{
GLubyte dest[PB_SIZE][4];
(*ctx->Driver.ReadRGBAPixels)( ctx, n, x, y, dest, mask );
if (ctx->RasterMask & ALPHABUF_BIT) {
gl_read_alpha_pixels( ctx, n, x, y, dest, mask );
}
rgba_logicop( ctx, n, mask, (GLuint *) rgba, (const GLuint *) dest );
}
