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added _swrast_get_row()

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This commit is contained in:
Brian Paul 2005-09-30 03:00:03 +00:00
parent 1ad6e08090
commit f493a04be0
2 changed files with 38 additions and 0 deletions
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33
src/mesa/swrast/s_span.c
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@ -1508,3 +1508,36 @@ _swrast_put_row(GLcontext *ctx, struct gl_renderbuffer *rb,
rb->PutRow(ctx, rb, count, x, y,
(const GLubyte *) values + skip * valueSize, NULL);
}
/**
* Wrapper for gl_renderbuffer::GetRow() which does clipping.
*/
void
_swrast_get_row(GLcontext *ctx, struct gl_renderbuffer *rb,
GLuint count, GLint x, GLint y,
GLvoid *values, GLuint valueSize)
{
GLint skip = 0;
if (y < 0 || y >= rb->Height)
return; /* above or below */
if (x + (GLint) count <= 0 || x >= rb->Width)
return; /* entirely left or right */
if (x + count > rb->Width) {
/* right clip */
GLint clip = x + count - rb->Width;
count -= clip;
}
if (x < 0) {
/* left clip */
skip = -x;
x = 0;
count -= skip;
}
rb->GetRow(ctx, rb, count, x, y, (GLubyte *) values + skip * valueSize);
}

5
src/mesa/swrast/s_span.h
View file

@ -77,4 +77,9 @@ _swrast_put_row(GLcontext *ctx, struct gl_renderbuffer *rb,
GLuint count, GLint x, GLint y,
const GLvoid *values, GLuint valueSize);
extern void
_swrast_get_row(GLcontext *ctx, struct gl_renderbuffer *rb,
GLuint count, GLint x, GLint y,
GLvoid *values, GLuint valueSize);
#endif