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Merge "minui: Clean up graphics_fbdev.cpp."

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Treehugger Robot 2017-02-09 20:31:01 +00:00 committed by Gerrit Code Review
commit 5121961421
1 changed files with 128 additions and 138 deletions
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266
minui/graphics_fbdev.cpp
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@ -14,20 +14,15 @@
* limitations under the License. * limitations under the License.
*/ */
#include <fcntl.h>
#include <linux/fb.h>
#include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/cdefs.h>
#include <sys/ioctl.h> #include <sys/ioctl.h>
#include <sys/mman.h> #include <sys/mman.h>
#include <sys/types.h> #include <sys/types.h>
#include <unistd.h>
#include <linux/fb.h>
#include <linux/kd.h>
#include "minui/minui.h" #include "minui/minui.h"
#include "graphics.h" #include "graphics.h"
@ -39,162 +34,157 @@ static void fbdev_exit(minui_backend*);
static GRSurface gr_framebuffer[2]; static GRSurface gr_framebuffer[2];
static bool double_buffered; static bool double_buffered;
static GRSurface* gr_draw = NULL; static GRSurface* gr_draw = nullptr;
static int displayed_buffer; static int displayed_buffer;
static fb_var_screeninfo vi; static fb_var_screeninfo vi;
static int fb_fd = -1; static int fb_fd = -1;
static minui_backend my_backend = { static minui_backend my_backend = {
.init = fbdev_init, .init = fbdev_init,
.flip = fbdev_flip, .flip = fbdev_flip,
.blank = fbdev_blank, .blank = fbdev_blank,
.exit = fbdev_exit, .exit = fbdev_exit,
}; };
minui_backend* open_fbdev() { minui_backend* open_fbdev() {
return &my_backend; return &my_backend;
} }
static void fbdev_blank(minui_backend* backend __unused, bool blank) static void fbdev_blank(minui_backend* backend __unused, bool blank) {
{ int ret = ioctl(fb_fd, FBIOBLANK, blank ? FB_BLANK_POWERDOWN : FB_BLANK_UNBLANK);
int ret; if (ret < 0) {
perror("ioctl(): blank");
ret = ioctl(fb_fd, FBIOBLANK, blank ? FB_BLANK_POWERDOWN : FB_BLANK_UNBLANK); }
if (ret < 0)
perror("ioctl(): blank");
} }
static void set_displayed_framebuffer(unsigned n) static void set_displayed_framebuffer(unsigned n) {
{ if (n > 1 || !double_buffered) return;
if (n > 1 || !double_buffered) return;
vi.yres_virtual = gr_framebuffer[0].height * 2; vi.yres_virtual = gr_framebuffer[0].height * 2;
vi.yoffset = n * gr_framebuffer[0].height; vi.yoffset = n * gr_framebuffer[0].height;
vi.bits_per_pixel = gr_framebuffer[0].pixel_bytes * 8; vi.bits_per_pixel = gr_framebuffer[0].pixel_bytes * 8;
if (ioctl(fb_fd, FBIOPUT_VSCREENINFO, &vi) < 0) { if (ioctl(fb_fd, FBIOPUT_VSCREENINFO, &vi) < 0) {
perror("active fb swap failed"); perror("active fb swap failed");
} }
displayed_buffer = n; displayed_buffer = n;
} }
static GRSurface* fbdev_init(minui_backend* backend) { static GRSurface* fbdev_init(minui_backend* backend) {
int fd = open("/dev/graphics/fb0", O_RDWR); int fd = open("/dev/graphics/fb0", O_RDWR);
if (fd == -1) { if (fd == -1) {
perror("cannot open fb0"); perror("cannot open fb0");
return NULL; return nullptr;
}
fb_fix_screeninfo fi;
if (ioctl(fd, FBIOGET_FSCREENINFO, &fi) < 0) {
perror("failed to get fb0 info");
close(fd);
return nullptr;
}
if (ioctl(fd, FBIOGET_VSCREENINFO, &vi) < 0) {
perror("failed to get fb0 info");
close(fd);
return nullptr;
}
// We print this out for informational purposes only, but
// throughout we assume that the framebuffer device uses an RGBX
// pixel format. This is the case for every development device I
// have access to. For some of those devices (eg, hammerhead aka
// Nexus 5), FBIOGET_VSCREENINFO *reports* that it wants a
// different format (XBGR) but actually produces the correct
// results on the display when you write RGBX.
//
// If you have a device that actually *needs* another pixel format
// (ie, BGRX, or 565), patches welcome...
printf(
"fb0 reports (possibly inaccurate):\n"
" vi.bits_per_pixel = %d\n"
" vi.red.offset = %3d .length = %3d\n"
" vi.green.offset = %3d .length = %3d\n"
" vi.blue.offset = %3d .length = %3d\n",
vi.bits_per_pixel, vi.red.offset, vi.red.length, vi.green.offset, vi.green.length,
vi.blue.offset, vi.blue.length);
void* bits = mmap(0, fi.smem_len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (bits == MAP_FAILED) {
perror("failed to mmap framebuffer");
close(fd);
return nullptr;
}
memset(bits, 0, fi.smem_len);
gr_framebuffer[0].width = vi.xres;
gr_framebuffer[0].height = vi.yres;
gr_framebuffer[0].row_bytes = fi.line_length;
gr_framebuffer[0].pixel_bytes = vi.bits_per_pixel / 8;
gr_framebuffer[0].data = static_cast<uint8_t*>(bits);
memset(gr_framebuffer[0].data, 0, gr_framebuffer[0].height * gr_framebuffer[0].row_bytes);
/* check if we can use double buffering */
if (vi.yres * fi.line_length * 2 <= fi.smem_len) {
double_buffered = true;
memcpy(gr_framebuffer + 1, gr_framebuffer, sizeof(GRSurface));
gr_framebuffer[1].data =
gr_framebuffer[0].data + gr_framebuffer[0].height * gr_framebuffer[0].row_bytes;
gr_draw = gr_framebuffer + 1;
} else {
double_buffered = false;
// Without double-buffering, we allocate RAM for a buffer to
// draw in, and then "flipping" the buffer consists of a
// memcpy from the buffer we allocated to the framebuffer.
gr_draw = static_cast<GRSurface*>(malloc(sizeof(GRSurface)));
memcpy(gr_draw, gr_framebuffer, sizeof(GRSurface));
gr_draw->data = static_cast<unsigned char*>(malloc(gr_draw->height * gr_draw->row_bytes));
if (!gr_draw->data) {
perror("failed to allocate in-memory surface");
return nullptr;
} }
}
fb_fix_screeninfo fi; memset(gr_draw->data, 0, gr_draw->height * gr_draw->row_bytes);
if (ioctl(fd, FBIOGET_FSCREENINFO, &fi) < 0) { fb_fd = fd;
perror("failed to get fb0 info"); set_displayed_framebuffer(0);
close(fd);
return NULL;
}
if (ioctl(fd, FBIOGET_VSCREENINFO, &vi) < 0) { printf("framebuffer: %d (%d x %d)\n", fb_fd, gr_draw->width, gr_draw->height);
perror("failed to get fb0 info");
close(fd);
return NULL;
}
// We print this out for informational purposes only, but fbdev_blank(backend, true);
// throughout we assume that the framebuffer device uses an RGBX fbdev_blank(backend, false);
// pixel format. This is the case for every development device I
// have access to. For some of those devices (eg, hammerhead aka
// Nexus 5), FBIOGET_VSCREENINFO *reports* that it wants a
// different format (XBGR) but actually produces the correct
// results on the display when you write RGBX.
//
// If you have a device that actually *needs* another pixel format
// (ie, BGRX, or 565), patches welcome...
printf("fb0 reports (possibly inaccurate):\n" return gr_draw;
" vi.bits_per_pixel = %d\n"
" vi.red.offset = %3d .length = %3d\n"
" vi.green.offset = %3d .length = %3d\n"
" vi.blue.offset = %3d .length = %3d\n",
vi.bits_per_pixel,
vi.red.offset, vi.red.length,
vi.green.offset, vi.green.length,
vi.blue.offset, vi.blue.length);
void* bits = mmap(0, fi.smem_len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (bits == MAP_FAILED) {
perror("failed to mmap framebuffer");
close(fd);
return NULL;
}
memset(bits, 0, fi.smem_len);
gr_framebuffer[0].width = vi.xres;
gr_framebuffer[0].height = vi.yres;
gr_framebuffer[0].row_bytes = fi.line_length;
gr_framebuffer[0].pixel_bytes = vi.bits_per_pixel / 8;
gr_framebuffer[0].data = static_cast<uint8_t*>(bits);
memset(gr_framebuffer[0].data, 0, gr_framebuffer[0].height * gr_framebuffer[0].row_bytes);
/* check if we can use double buffering */
if (vi.yres * fi.line_length * 2 <= fi.smem_len) {
double_buffered = true;
memcpy(gr_framebuffer+1, gr_framebuffer, sizeof(GRSurface));
gr_framebuffer[1].data = gr_framebuffer[0].data +
gr_framebuffer[0].height * gr_framebuffer[0].row_bytes;
gr_draw = gr_framebuffer+1;
} else {
double_buffered = false;
// Without double-buffering, we allocate RAM for a buffer to
// draw in, and then "flipping" the buffer consists of a
// memcpy from the buffer we allocated to the framebuffer.
gr_draw = (GRSurface*) malloc(sizeof(GRSurface));
memcpy(gr_draw, gr_framebuffer, sizeof(GRSurface));
gr_draw->data = (unsigned char*) malloc(gr_draw->height * gr_draw->row_bytes);
if (!gr_draw->data) {
perror("failed to allocate in-memory surface");
return NULL;
}
}
memset(gr_draw->data, 0, gr_draw->height * gr_draw->row_bytes);
fb_fd = fd;
set_displayed_framebuffer(0);
printf("framebuffer: %d (%d x %d)\n", fb_fd, gr_draw->width, gr_draw->height);
fbdev_blank(backend, true);
fbdev_blank(backend, false);
return gr_draw;
} }
static GRSurface* fbdev_flip(minui_backend* backend __unused) { static GRSurface* fbdev_flip(minui_backend* backend __unused) {
if (double_buffered) { if (double_buffered) {
// Change gr_draw to point to the buffer currently displayed, // Change gr_draw to point to the buffer currently displayed,
// then flip the driver so we're displaying the other buffer // then flip the driver so we're displaying the other buffer
// instead. // instead.
gr_draw = gr_framebuffer + displayed_buffer; gr_draw = gr_framebuffer + displayed_buffer;
set_displayed_framebuffer(1-displayed_buffer); set_displayed_framebuffer(1 - displayed_buffer);
} else { } else {
// Copy from the in-memory surface to the framebuffer. // Copy from the in-memory surface to the framebuffer.
memcpy(gr_framebuffer[0].data, gr_draw->data, memcpy(gr_framebuffer[0].data, gr_draw->data, gr_draw->height * gr_draw->row_bytes);
gr_draw->height * gr_draw->row_bytes); }
} return gr_draw;
return gr_draw;
} }
static void fbdev_exit(minui_backend* backend __unused) { static void fbdev_exit(minui_backend* backend __unused) {
close(fb_fd); close(fb_fd);
fb_fd = -1; fb_fd = -1;
if (!double_buffered && gr_draw) { if (!double_buffered && gr_draw) {
free(gr_draw->data); free(gr_draw->data);
free(gr_draw); free(gr_draw);
} }
gr_draw = NULL; gr_draw = nullptr;
} }