diff options
Diffstat (limited to 'minui/graphics_fbdev.cpp')
| -rw-r--r-- | minui/graphics_fbdev.cpp | 268 |
1 files changed, 139 insertions, 129 deletions
diff --git a/minui/graphics_fbdev.cpp b/minui/graphics_fbdev.cpp index dd4c9d465..2d70249ed 100644 --- a/minui/graphics_fbdev.cpp +++ b/minui/graphics_fbdev.cpp @@ -14,15 +14,20 @@ * limitations under the License. */ -#include <fcntl.h> -#include <linux/fb.h> -#include <stdio.h> #include <stdlib.h> #include <string.h> +#include <unistd.h> + +#include <fcntl.h> +#include <stdio.h> + +#include <sys/cdefs.h> #include <sys/ioctl.h> #include <sys/mman.h> #include <sys/types.h> -#include <unistd.h> + +#include <linux/fb.h> +#include <linux/kd.h> #include "minui/minui.h" #include "graphics.h" @@ -34,157 +39,162 @@ static void fbdev_exit(minui_backend*); static GRSurface gr_framebuffer[2]; static bool double_buffered; -static GRSurface* gr_draw = nullptr; +static GRSurface* gr_draw = NULL; static int displayed_buffer; static fb_var_screeninfo vi; static int fb_fd = -1; static minui_backend my_backend = { - .init = fbdev_init, - .flip = fbdev_flip, - .blank = fbdev_blank, - .exit = fbdev_exit, + .init = fbdev_init, + .flip = fbdev_flip, + .blank = fbdev_blank, + .exit = fbdev_exit, }; minui_backend* open_fbdev() { - return &my_backend; + return &my_backend; } -static void fbdev_blank(minui_backend* backend __unused, bool blank) { - int ret = ioctl(fb_fd, FBIOBLANK, blank ? FB_BLANK_POWERDOWN : FB_BLANK_UNBLANK); - if (ret < 0) { - perror("ioctl(): blank"); - } +static void fbdev_blank(minui_backend* backend __unused, bool blank) +{ + int ret; + + 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) { - if (n > 1 || !double_buffered) return; +static void set_displayed_framebuffer(unsigned n) +{ + if (n > 1 || !double_buffered) return; - vi.yres_virtual = gr_framebuffer[0].height * 2; - vi.yoffset = n * gr_framebuffer[0].height; - vi.bits_per_pixel = gr_framebuffer[0].pixel_bytes * 8; - if (ioctl(fb_fd, FBIOPUT_VSCREENINFO, &vi) < 0) { - perror("active fb swap failed"); - } - displayed_buffer = n; + vi.yres_virtual = gr_framebuffer[0].height * 2; + vi.yoffset = n * gr_framebuffer[0].height; + vi.bits_per_pixel = gr_framebuffer[0].pixel_bytes * 8; + if (ioctl(fb_fd, FBIOPUT_VSCREENINFO, &vi) < 0) { + perror("active fb swap failed"); + } + displayed_buffer = n; } static GRSurface* fbdev_init(minui_backend* backend) { - int fd = open("/dev/graphics/fb0", O_RDWR); - if (fd == -1) { - perror("cannot open fb0"); - 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; + int fd = open("/dev/graphics/fb0", O_RDWR); + if (fd == -1) { + perror("cannot open fb0"); + return NULL; } - } - memset(gr_draw->data, 0, gr_draw->height * gr_draw->row_bytes); - fb_fd = fd; - set_displayed_framebuffer(0); + fb_fix_screeninfo fi; + if (ioctl(fd, FBIOGET_FSCREENINFO, &fi) < 0) { + perror("failed to get fb0 info"); + close(fd); + return NULL; + } - printf("framebuffer: %d (%d x %d)\n", fb_fd, gr_draw->width, gr_draw->height); + if (ioctl(fd, FBIOGET_VSCREENINFO, &vi) < 0) { + perror("failed to get fb0 info"); + close(fd); + return NULL; + } - fbdev_blank(backend, true); - fbdev_blank(backend, false); + // 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 NULL; + } - return gr_draw; + 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) { - if (double_buffered) { - // Change gr_draw to point to the buffer currently displayed, - // then flip the driver so we're displaying the other buffer - // instead. - gr_draw = gr_framebuffer + displayed_buffer; - set_displayed_framebuffer(1 - displayed_buffer); - } else { - // Copy from the in-memory surface to the framebuffer. - memcpy(gr_framebuffer[0].data, gr_draw->data, gr_draw->height * gr_draw->row_bytes); - } - return gr_draw; + if (double_buffered) { + // Change gr_draw to point to the buffer currently displayed, + // then flip the driver so we're displaying the other buffer + // instead. + gr_draw = gr_framebuffer + displayed_buffer; + set_displayed_framebuffer(1-displayed_buffer); + } else { + // Copy from the in-memory surface to the framebuffer. + memcpy(gr_framebuffer[0].data, gr_draw->data, + gr_draw->height * gr_draw->row_bytes); + } + return gr_draw; } static void fbdev_exit(minui_backend* backend __unused) { - close(fb_fd); - fb_fd = -1; - - if (!double_buffered && gr_draw) { - free(gr_draw->data); - free(gr_draw); - } - gr_draw = nullptr; + close(fb_fd); + fb_fd = -1; + + if (!double_buffered && gr_draw) { + free(gr_draw->data); + free(gr_draw); + } + gr_draw = NULL; } |