diff options
author | Brian Paul <[email protected]> | 2005-09-30 03:00:03 +0000 |
---|---|---|
committer | Brian Paul <[email protected]> | 2005-09-30 03:00:03 +0000 |
commit | f493a04be0e004bb07f84b2e28124ed8cb6a9b38 (patch) | |
tree | 004499d78bfe8bd7222c23f93b2e7d73b8899767 | |
parent | 1ad6e0809069833f17578a9751ac8408362d410c (diff) |
added _swrast_get_row()
-rw-r--r-- | src/mesa/swrast/s_span.c | 33 | ||||
-rw-r--r-- | src/mesa/swrast/s_span.h | 5 |
2 files changed, 38 insertions, 0 deletions
diff --git a/src/mesa/swrast/s_span.c b/src/mesa/swrast/s_span.c index a9745063d90..b6d4098f247 100644 --- a/src/mesa/swrast/s_span.c +++ b/src/mesa/swrast/s_span.c @@ -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); +} diff --git a/src/mesa/swrast/s_span.h b/src/mesa/swrast/s_span.h index 0c853746b82..40a57e1ae53 100644 --- a/src/mesa/swrast/s_span.h +++ b/src/mesa/swrast/s_span.h @@ -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 |