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Commit Graph

Author	SHA1	Message	Date
eric.gao@rock-chips.com	7682736c89	video: Fix crash when scroll screen After enabling log printing to lcd, when the screen starts scrolling, system crashes. Log is shown as bellow: "Synchronous Abort" handler, esr 0x96000045 "Synchronous Abort" handler, esr 0x96000045 Checking the source code, we found that the variable "pixels" gets a wrong value: int pixels = VIDEO_FONT_HEIGHT * vid_priv->line_length; "pixels" here means the value of pixels for a character, rather than the bytes for a character. So the variable "pixels" is 4 times bigger than it's exact value, which will cause the memory overflow when the cpu runs the following code: for (i = 0; i < pixels; i++) *dst++ = clr; <<---- Signed-off-by: Eric Gao <eric.gao@rock-chips.com>	8 years ago
Simon Glass	f266178698	video: Use fractional units for X coordinates With anti-aliased fonts we need a more fine-grained horizontal position than a single pixel. Characters can be positioned to start part-way through a pixel, with anti-aliasing (greyscale edges) taking care of the visual effect. To cope with this, use fractional units (1/256 pixel) for horizontal positions in the text console. Signed-off-by: Simon Glass <sjg@chromium.org> [agust: rebased] Signed-off-by: Anatolij Gustschin <agust@denx.de>	9 years ago
Simon Glass	72cded9ec0	dm: video: Add a 'normal' text console driver Most of the time we don't need to rotate the display so a simple font blitting feature is enough for our purposes. Add a simple driver which supports this function. It provides text output on the console using the standard 8x16-pixel font. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Anatolij Gustschin <agust@denx.de>	9 years ago

Author

SHA1

Message

Date

eric.gao@rock-chips.com

7682736c89

video: Fix crash when scroll screen

After enabling log printing to lcd, when the screen starts
scrolling, system crashes. Log is shown as bellow:

    "Synchronous Abort" handler, esr 0x96000045
    "Synchronous Abort" handler, esr 0x96000045

Checking the source code, we found that the variable "pixels"
gets a wrong value:

    int pixels = VIDEO_FONT_HEIGHT * vid_priv->line_length;

"pixels" here means the value of pixels for a character, rather
than the bytes for a character. So the variable "pixels" is 4
times bigger than it's exact value, which will cause the memory
overflow when the cpu runs the following code:

    for (i = 0; i < pixels; i++)
        *dst++ = clr; <<----

Signed-off-by: Eric Gao <eric.gao@rock-chips.com>

Simon Glass

f266178698

video: Use fractional units for X coordinates

With anti-aliased fonts we need a more fine-grained horizontal position
than a single pixel. Characters can be positioned to start part-way through
a pixel, with anti-aliasing (greyscale edges) taking care of the visual
effect.

To cope with this, use fractional units (1/256 pixel) for horizontal
positions in the text console.

Signed-off-by: Simon Glass <sjg@chromium.org>
[agust: rebased]
Signed-off-by: Anatolij Gustschin <agust@denx.de>

Simon Glass

72cded9ec0

dm: video: Add a 'normal' text console driver

Most of the time we don't need to rotate the display so a simple font
blitting feature is enough for our purposes. Add a simple driver which
supports this function. It provides text output on the console using
the standard 8x16-pixel font.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Anatolij Gustschin <agust@denx.de>

3 Commits (7f0cfe478bd817d2bb373522222cf06630fea3cd)