diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2009-07-22 00:01:22 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2009-07-22 00:01:22 +0100 |
| commit | f2f42ec70a626a69f4b29f55f9d1818942bb0b19 (patch) | |
| tree | 5511a65438d692775a96fb6f6625aa6a67fa4a08 /src/cairo-gl-surface.c | |
| parent | 9e420f5d0669ec12eaaf7faf4e55642c10b95fb3 (diff) | |
[gl] Apply pixel sample bias for spans
Diffstat (limited to 'src/cairo-gl-surface.c')
| -rw-r--r-- | src/cairo-gl-surface.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/src/cairo-gl-surface.c b/src/cairo-gl-surface.c index 7ce27a0b..b547e7fc 100644 --- a/src/cairo-gl-surface.c +++ b/src/cairo-gl-surface.c @@ -45,6 +45,8 @@ slim_hidden_proto (cairo_gl_surface_create); #define ARRAY_SIZE(array) (sizeof (array) / sizeof (array[0])) +#define BIAS .375 + static inline float int_as_float (uint32_t val) { @@ -1611,14 +1613,14 @@ _cairo_gl_emit_span_vertex (cairo_gl_surface_span_renderer_t *renderer, src_attributes = &renderer->setup.src.operand.texture.attributes; - vertices[v++] = dst_x; - vertices[v++] = dst_y; + vertices[v++] = dst_x + BIAS; + vertices[v++] = dst_y + BIAS; vertices[v++] = int_as_float (alpha << 24); if (renderer->setup.src.type == OPERAND_TEXTURE) { double s, t; - s = dst_x; - t = dst_y; + s = dst_x + BIAS; + t = dst_y + BIAS; cairo_matrix_transform_point (&src_attributes->matrix, &s, &t); vertices[v++] = s; vertices[v++] = t; |