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Merge "graphics: add support for "single buffering""

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This commit is contained in:
Doug Zongker
2012-07-20 15:04:08 -07:00
committed by android code review
parent 989a28599a 0e34880ca2
commit dd6cd4fcc1
1 changed files with 10 additions and 2 deletions
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12
minui/graphics.c
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@@ -57,6 +57,7 @@ static GGLSurface gr_font_texture;
static GGLSurface gr_framebuffer[2];
static GGLSurface gr_mem_surface;
static unsigned gr_active_fb = 0;
static unsigned double_buffering = 0;
static int gr_fb_fd = -1;
static int gr_vt_fd = -1;
@@ -139,6 +140,12 @@ static int get_framebuffer(GGLSurface *fb)
fb++;
/* check if we can use double buffering */
if (vi.yres * fi.line_length * 2 > fi.smem_len)
return fd;
double_buffering = 1;
fb->version = sizeof(*fb);
fb->width = vi.xres;
fb->height = vi.yres;
@@ -161,7 +168,7 @@ static void get_memory_surface(GGLSurface* ms) {
static void set_active_framebuffer(unsigned n)
{
if (n > 1) return;
if (n > 1 || !double_buffering) return;
vi.yres_virtual = vi.yres * PIXEL_SIZE;
vi.yoffset = n * vi.yres;
vi.bits_per_pixel = PIXEL_SIZE * 8;
@@ -175,7 +182,8 @@ void gr_flip(void)
GGLContext *gl = gr_context;
/* swap front and back buffers */
gr_active_fb = (gr_active_fb + 1) & 1;
if (double_buffering)
gr_active_fb = (gr_active_fb + 1) & 1;
/* copy data from the in-memory surface to the buffer we're about
* to make active. */