[FFmpeg-devel] 回复: [PATCH 1/1] add without_captureblt option for libavdevice/gdigrab.c, when useing the bitblt function with CAPTUREBLT it caused the mouse cursor flicker. most time we dont need this flag to capture window

[fgodt]

On 2019/12/11 下午10:19, Andriy Gelman wrote:
> On Wed, 11. Dec 09:01, _ FgoDt wrote:
>> did someone review the patch?
>>
>> ________________________________
>> 发件人: _ FgoDt <fgodtdev at hotmail.com>
>> 发送时间: 2019年11月15日 15:03
>> 收件人: ffmpeg-devel at ffmpeg.org <ffmpeg-devel at ffmpeg.org>
>> 抄送: _ FgoDt <fgodtdev at hotmail.com>
>> 主题: [PATCH 1/1] add without_captureblt option for libavdevice/gdigrab.c, when useing the bitblt function with CAPTUREBLT it caused the mouse cursor flicker. most time we dont need this flag to capture window
>> From: fgodt <fgodtdev at hotmail.com>
> This would be in commit, you should use your name.
>
>> Signed-off-by: fgodt <fgodtdev at hotmail.com>
>> ---
>>   libavdevice/gdigrab.c | 11 ++++++++++-
>>   1 file changed, 10 insertions(+), 1 deletion(-)
>>
>> diff --git a/libavdevice/gdigrab.c b/libavdevice/gdigrab.c
>> index f4444406fa..0ab0cfed01 100644
>> --- a/libavdevice/gdigrab.c
>> +++ b/libavdevice/gdigrab.c
>> @@ -53,6 +53,8 @@ struct gdigrab {
>>       int        offset_x;    /**< Capture x offset (private option) */
>>       int        offset_y;    /**< Capture y offset (private option) */
>>
>> +    int        without_captureblt; /**< capture without captureblt */
>> +
>>       HWND       hwnd;        /**< Handle of the window for the grab */
>>       HDC        source_hdc;  /**< Source device context */
>>       HDC        dest_hdc;    /**< Destination, source-compatible DC */
>> @@ -542,6 +544,8 @@ static int gdigrab_read_packet(AVFormatContext *s1, AVPacket *pkt)
>>
>>       int64_t curtime, delay;
>>
>> +    unsigned long flag;
>> +
>>       /* Calculate the time of the next frame */
>>       time_frame += INT64_C(1000000);
>>
>> @@ -570,12 +574,16 @@ static int gdigrab_read_packet(AVFormatContext *s1, AVPacket *pkt)
>>           return AVERROR(ENOMEM);
>>       pkt->pts = curtime;
>>
>> +    flag = SRCCOPY;
>> +    if(!gdigrab->without_captureblt)
>> +        flag |= CAPTUREBLT;
>> +
>>       /* Blit screen grab */
>>       if (!BitBlt(dest_hdc, 0, 0,
>>                   clip_rect.right - clip_rect.left,
>>                   clip_rect.bottom - clip_rect.top,
>>                   source_hdc,
>> -                clip_rect.left, clip_rect.top, SRCCOPY | CAPTUREBLT)) {
>> +                clip_rect.left, clip_rect.top, flag)) {
>>           WIN32_API_ERROR("Failed to capture image");
>>           return AVERROR(EIO);
>>       }
>> @@ -639,6 +647,7 @@ static const AVOption options[] = {
>>       { "video_size", "set video frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
>>       { "offset_x", "capture area x offset", OFFSET(offset_x), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC },
>>       { "offset_y", "capture area y offset", OFFSET(offset_y), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC },
>> +    { "without_captureblt", "capture without captureblt", OFFSET(without_captureblt), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC },
>>       { NULL },
>>   };
> IMO a not negated option would be better. i.e. use_captureblt that's enabled by
> default.
>
> You also need to update the docs.
>
> I don't have windows so can't test on my machine.
>

Thanks

I will send an other patch, change without_captureblt to use_captureblt 
and update the docs, also test on my pc